diff --git a/README.md b/README.md
new file mode 100644
index 0000000..8b12165
--- /dev/null
+++ b/README.md
@@ -0,0 +1,96 @@
+<div align="center">
+  <img src="assets/SubMiner.png" width="169" alt="SubMiner logo">
+  <h1>SubMiner</h1>
+  <strong>Look up words, mine to Anki, and enrich cards with context — without leaving mpv.</strong>
+  <br /><br />
+
+[![License: GPL v3](https://img.shields.io/badge/License-GPLv3-blue.svg)](https://www.gnu.org/licenses/gpl-3.0)
+[![Linux](https://img.shields.io/badge/platform-Linux%20%7C%20macOS-informational)]()
+[![Docs](https://img.shields.io/badge/docs-docs.subminer.moe-blueviolet)](https://docs.subminer.moe)
+
+</div>
+
+<br />
+
+<div align="center">
+
+[![SubMiner demo (GIF preview)](./assets/minecard.gif)](./assets/minecard.mp4)
+
+</div>
+
+<br />
+
+## What it does
+
+SubMiner is an Electron overlay that sits on top of mpv. It turns your video player into a full sentence-mining workstation:
+
+- **Hover to look up** — Yomitan dictionary popups directly on subtitles
+- **One-key mining** — Creates Anki cards with sentence, audio, screenshot, and translation
+- **N+1 highlighting** — Marks known words from your Anki deck so unknown ones jump out
+- **Subtitle tools** — Download from Jimaku, sync with alass/ffsubsync, all in-player
+- **Immersion tracking** — SQLite-powered stats on your watch time and mining activity
+- **Texthooker page built in** — WebSocket streaming to external tools, no extra setup
+
+## Quick start
+
+### 1. Install
+
+**Linux (AppImage):**
+
+```bash
+wget https://github.com/ksyasuda/SubMiner/releases/latest/download/SubMiner-0.1.0.AppImage -O ~/.local/bin/SubMiner.AppImage
+chmod +x ~/.local/bin/SubMiner.AppImage
+wget https://github.com/ksyasuda/SubMiner/releases/latest/download/subminer -O ~/.local/bin/subminer
+chmod +x ~/.local/bin/subminer
+```
+
+> [!NOTE]
+> The `subminer` wrapper uses a [Bun](https://bun.sh) shebang. Make sure `bun` is on your `PATH`.
+
+**From source** or **macOS** — see the [installation guide](https://docs.subminer.moe/installation#from-source).
+
+### 2. Install the mpv plugin and configuration file
+
+```bash
+wget https://github.com/ksyasuda/SubMiner/releases/latest/download/subminer-assets-0.1.0.tar.gz -O /tmp/subminer-assets.tar.gz
+tar -xzf /tmp/subminer-assets.tar.gz -C /tmp
+cp /tmp/plugin/subminer.lua ~/.config/mpv/scripts/
+cp /tmp/plugin/subminer.conf ~/.config/mpv/script-opts/
+mkdir -p ~/.config/SubMiner && cp /tmp/config.example.jsonc ~/.config/SubMiner/config.jsonc
+```
+
+### 3. Set up Yomitan Dictionaries
+
+```bash
+subminer app --start --yomitan
+```
+
+### 4. Mine
+
+```bash
+subminer app --start --background
+subminer video.mkv
+```
+
+## Requirements
+
+| Required                                   | Optional                                           |
+| ------------------------------------------ | -------------------------------------------------- |
+| `bun`                                      |                                                    |
+| `mpv` with IPC socket                      | `yt-dlp`                                           |
+| `ffmpeg`                                   | `guessit` (better AniSkip title/episode detection) |
+| `mecab` + `mecab-ipadic`                   | `fzf` / `rofi`                                     |
+| Linux: `hyprctl` or `xdotool` + `xwininfo` | `chafa`, `ffmpegthumbnailer`                       |
+| macOS: Accessibility permission            |                                                    |
+
+## Documentation
+
+For full guides on configuration, Anki, Jellyfin, and more, see [docs.subminer.moe](https://docs.subminer.moe).
+
+## Acknowledgments
+
+Built on the shoulders of [GameSentenceMiner](https://github.com/bpwhelan/GameSentenceMiner), [mpvacious](https://github.com/Ajatt-Tools/mpvacious), [Anacreon-Script](https://github.com/friedrich-de/Anacreon-Script), and [autosubsync-mpv](https://github.com/joaquintorres/autosubsync-mpv). Subtitles powered by [Jimaku.cc](https://jimaku.cc). Dictionary lookups via [Yomitan](https://github.com/yomidevs/yomitan).
+
+## License
+
+[GNU General Public License v3.0](LICENSE)
diff --git a/config.example.jsonc b/config.example.jsonc
new file mode 100644
index 0000000..f7f4926
--- /dev/null
+++ b/config.example.jsonc
@@ -0,0 +1,340 @@
+/**
+ * SubMiner Example Configuration File
+ *
+ * This file is auto-generated from src/config/definitions.ts.
+ * Copy to $XDG_CONFIG_HOME/SubMiner/config.jsonc (or ~/.config/SubMiner/config.jsonc) and edit as needed.
+ */
+{
+
+  // ==========================================
+  // Overlay Auto-Start
+  // When overlay connects to mpv, automatically show overlay and hide mpv subtitles.
+  // ==========================================
+  "auto_start_overlay": false, // When overlay connects to mpv, automatically show overlay and hide mpv subtitles. Values: true | false
+
+  // ==========================================
+  // Visible Overlay Subtitle Binding
+  // Control whether visible overlay toggles also toggle MPV subtitle visibility.
+  // When enabled, visible overlay hides MPV subtitles; when disabled, MPV subtitles are left unchanged.
+  // ==========================================
+  "bind_visible_overlay_to_mpv_sub_visibility": true, // Link visible overlay toggles to MPV subtitle visibility (primary and secondary). Values: true | false
+
+  // ==========================================
+  // Texthooker Server
+  // Control whether browser opens automatically for texthooker.
+  // ==========================================
+  "texthooker": {
+    "openBrowser": true // Open browser setting. Values: true | false
+  }, // Control whether browser opens automatically for texthooker.
+
+  // ==========================================
+  // WebSocket Server
+  // Built-in WebSocket server broadcasts subtitle text to connected clients.
+  // Auto mode disables built-in server if mpv_websocket is detected.
+  // ==========================================
+  "websocket": {
+    "enabled": "auto", // Built-in subtitle websocket server mode. Values: auto | true | false
+    "port": 6677 // Built-in subtitle websocket server port.
+  }, // Built-in WebSocket server broadcasts subtitle text to connected clients.
+
+  // ==========================================
+  // Logging
+  // Controls logging verbosity.
+  // Set to debug for full runtime diagnostics.
+  // ==========================================
+  "logging": {
+    "level": "info" // Minimum log level for runtime logging. Values: debug | info | warn | error
+  }, // Controls logging verbosity.
+
+  // ==========================================
+  // Keyboard Shortcuts
+  // Overlay keyboard shortcuts. Set a shortcut to null to disable.
+  // Hot-reload: shortcut changes apply live and update the session help modal on reopen.
+  // ==========================================
+  "shortcuts": {
+    "toggleVisibleOverlayGlobal": "Alt+Shift+O", // Toggle visible overlay global setting.
+    "toggleInvisibleOverlayGlobal": "Alt+Shift+I", // Toggle invisible overlay global setting.
+    "copySubtitle": "CommandOrControl+C", // Copy subtitle setting.
+    "copySubtitleMultiple": "CommandOrControl+Shift+C", // Copy subtitle multiple setting.
+    "updateLastCardFromClipboard": "CommandOrControl+V", // Update last card from clipboard setting.
+    "triggerFieldGrouping": "CommandOrControl+G", // Trigger field grouping setting.
+    "triggerSubsync": "Ctrl+Alt+S", // Trigger subsync setting.
+    "mineSentence": "CommandOrControl+S", // Mine sentence setting.
+    "mineSentenceMultiple": "CommandOrControl+Shift+S", // Mine sentence multiple setting.
+    "multiCopyTimeoutMs": 3000, // Timeout for multi-copy/mine modes.
+    "toggleSecondarySub": "CommandOrControl+Shift+V", // Toggle secondary sub setting.
+    "markAudioCard": "CommandOrControl+Shift+A", // Mark audio card setting.
+    "openRuntimeOptions": "CommandOrControl+Shift+O", // Open runtime options setting.
+    "openJimaku": "Ctrl+Shift+J" // Open jimaku setting.
+  }, // Overlay keyboard shortcuts. Set a shortcut to null to disable.
+
+  // ==========================================
+  // Invisible Overlay
+  // Startup behavior for the invisible interactive subtitle mining layer.
+  // Invisible subtitle position edit mode: Ctrl/Cmd+Shift+P to toggle, arrow keys to move, Enter or Ctrl/Cmd+S to save, Esc to cancel.
+  // This edit-mode shortcut is fixed and is not currently configurable.
+  // ==========================================
+  "invisibleOverlay": {
+    "startupVisibility": "platform-default" // Startup visibility setting.
+  }, // Startup behavior for the invisible interactive subtitle mining layer.
+
+  // ==========================================
+  // Keybindings (MPV Commands)
+  // Extra keybindings that are merged with built-in defaults.
+  // Set command to null to disable a default keybinding.
+  // Hot-reload: keybinding changes apply live and update the session help modal on reopen.
+  // ==========================================
+  "keybindings": [], // Extra keybindings that are merged with built-in defaults.
+
+  // ==========================================
+  // Secondary Subtitles
+  // Dual subtitle track options.
+  // Used by subminer YouTube subtitle generation as secondary language preferences.
+  // Hot-reload: defaultMode updates live while SubMiner is running.
+  // ==========================================
+  "secondarySub": {
+    "secondarySubLanguages": [], // Secondary sub languages setting.
+    "autoLoadSecondarySub": false, // Auto load secondary sub setting. Values: true | false
+    "defaultMode": "hover" // Default mode setting.
+  }, // Dual subtitle track options.
+
+  // ==========================================
+  // Auto Subtitle Sync
+  // Subsync engine and executable paths.
+  // ==========================================
+  "subsync": {
+    "defaultMode": "auto", // Subsync default mode. Values: auto | manual
+    "alass_path": "", // Alass path setting.
+    "ffsubsync_path": "", // Ffsubsync path setting.
+    "ffmpeg_path": "" // Ffmpeg path setting.
+  }, // Subsync engine and executable paths.
+
+  // ==========================================
+  // Subtitle Position
+  // Initial vertical subtitle position from the bottom.
+  // ==========================================
+  "subtitlePosition": {
+    "yPercent": 10 // Y percent setting.
+  }, // Initial vertical subtitle position from the bottom.
+
+  // ==========================================
+  // Subtitle Appearance
+  // Primary and secondary subtitle styling.
+  // Hot-reload: subtitle style changes apply live without restarting SubMiner.
+  // ==========================================
+  "subtitleStyle": {
+    "enableJlpt": false, // Enable JLPT vocabulary level underlines. When disabled, JLPT tagging lookup and underlines are skipped. Values: true | false
+    "preserveLineBreaks": false, // Preserve line breaks in visible overlay subtitle rendering. When false, line breaks are flattened to spaces for a single-line flow. Values: true | false
+    "hoverTokenColor": "#c6a0f6", // Hex color used for hovered subtitle token highlight in mpv.
+    "fontFamily": "M PLUS 1, Noto Sans CJK JP Regular, Noto Sans CJK JP, Hiragino Sans, Hiragino Kaku Gothic ProN, Yu Gothic, Arial Unicode MS, Arial, sans-serif", // Font family setting.
+    "fontSize": 35, // Font size setting.
+    "fontColor": "#cad3f5", // Font color setting.
+    "fontWeight": "normal", // Font weight setting.
+    "fontStyle": "normal", // Font style setting.
+    "backgroundColor": "rgb(30, 32, 48, 0.88)", // Background color setting.
+    "nPlusOneColor": "#c6a0f6", // N plus one color setting.
+    "knownWordColor": "#a6da95", // Known word color setting.
+    "jlptColors": {
+      "N1": "#ed8796", // N1 setting.
+      "N2": "#f5a97f", // N2 setting.
+      "N3": "#f9e2af", // N3 setting.
+      "N4": "#a6e3a1", // N4 setting.
+      "N5": "#8aadf4" // N5 setting.
+    }, // Jlpt colors setting.
+    "frequencyDictionary": {
+      "enabled": false, // Enable frequency-dictionary-based highlighting based on token rank. Values: true | false
+      "sourcePath": "", // Optional absolute path to a frequency dictionary directory. If empty, built-in discovery search paths are used.
+      "topX": 1000, // Only color tokens with frequency rank <= topX (default: 1000).
+      "mode": "single", // single: use one color for all matching tokens. banded: use color ramp by frequency band. Values: single | banded
+      "singleColor": "#f5a97f", // Color used when frequencyDictionary.mode is `single`.
+      "bandedColors": [
+        "#ed8796",
+        "#f5a97f",
+        "#f9e2af",
+        "#a6e3a1",
+        "#8aadf4"
+      ] // Five colors used for rank bands when mode is `banded` (from most common to least within topX).
+    }, // Frequency dictionary setting.
+    "secondary": {
+      "fontSize": 24, // Font size setting.
+      "fontColor": "#ffffff", // Font color setting.
+      "backgroundColor": "transparent", // Background color setting.
+      "fontWeight": "normal", // Font weight setting.
+      "fontStyle": "normal", // Font style setting.
+      "fontFamily": "M PLUS 1, Noto Sans CJK JP Regular, Noto Sans CJK JP, Hiragino Sans, Hiragino Kaku Gothic ProN, Yu Gothic, Arial Unicode MS, Arial, sans-serif" // Font family setting.
+    } // Secondary setting.
+  }, // Primary and secondary subtitle styling.
+
+  // ==========================================
+  // AnkiConnect Integration
+  // Automatic Anki updates and media generation options.
+  // Hot-reload: AI translation settings update live while SubMiner is running.
+  // Most other AnkiConnect settings still require restart.
+  // ==========================================
+  "ankiConnect": {
+    "enabled": false, // Enable AnkiConnect integration. Values: true | false
+    "url": "http://127.0.0.1:8765", // Url setting.
+    "pollingRate": 3000, // Polling interval in milliseconds.
+    "tags": [
+      "SubMiner"
+    ], // Tags to add to cards mined or updated by SubMiner. Provide an empty array to disable automatic tagging.
+    "fields": {
+      "audio": "ExpressionAudio", // Audio setting.
+      "image": "Picture", // Image setting.
+      "sentence": "Sentence", // Sentence setting.
+      "miscInfo": "MiscInfo", // Misc info setting.
+      "translation": "SelectionText" // Translation setting.
+    }, // Fields setting.
+    "ai": {
+      "enabled": false, // Enabled setting. Values: true | false
+      "alwaysUseAiTranslation": false, // Always use ai translation setting. Values: true | false
+      "apiKey": "", // Api key setting.
+      "model": "openai/gpt-4o-mini", // Model setting.
+      "baseUrl": "https://openrouter.ai/api", // Base url setting.
+      "targetLanguage": "English", // Target language setting.
+      "systemPrompt": "You are a translation engine. Return only the translated text with no explanations." // System prompt setting.
+    }, // Ai setting.
+    "media": {
+      "generateAudio": true, // Generate audio setting. Values: true | false
+      "generateImage": true, // Generate image setting. Values: true | false
+      "imageType": "static", // Image type setting.
+      "imageFormat": "jpg", // Image format setting.
+      "imageQuality": 92, // Image quality setting.
+      "animatedFps": 10, // Animated fps setting.
+      "animatedMaxWidth": 640, // Animated max width setting.
+      "animatedCrf": 35, // Animated crf setting.
+      "audioPadding": 0.5, // Audio padding setting.
+      "fallbackDuration": 3, // Fallback duration setting.
+      "maxMediaDuration": 30 // Max media duration setting.
+    }, // Media setting.
+    "behavior": {
+      "overwriteAudio": true, // Overwrite audio setting. Values: true | false
+      "overwriteImage": true, // Overwrite image setting. Values: true | false
+      "mediaInsertMode": "append", // Media insert mode setting.
+      "highlightWord": true, // Highlight word setting. Values: true | false
+      "notificationType": "osd", // Notification type setting.
+      "autoUpdateNewCards": true // Automatically update newly added cards. Values: true | false
+    }, // Behavior setting.
+    "nPlusOne": {
+      "highlightEnabled": false, // Enable fast local highlighting for words already known in Anki. Values: true | false
+      "refreshMinutes": 1440, // Minutes between known-word cache refreshes.
+      "matchMode": "headword", // Known-word matching strategy for N+1 highlighting. Values: headword | surface
+      "decks": [], // Decks used for N+1 known-word cache scope. Supports one or more deck names.
+      "minSentenceWords": 3, // Minimum sentence word count required for N+1 targeting (default: 3).
+      "nPlusOne": "#c6a0f6", // Color used for the single N+1 target token highlight.
+      "knownWord": "#a6da95" // Color used for legacy known-word highlights.
+    }, // N plus one setting.
+    "metadata": {
+      "pattern": "[SubMiner] %f (%t)" // Pattern setting.
+    }, // Metadata setting.
+    "isLapis": {
+      "enabled": false, // Enabled setting. Values: true | false
+      "sentenceCardModel": "Japanese sentences" // Sentence card model setting.
+    }, // Is lapis setting.
+    "isKiku": {
+      "enabled": false, // Enabled setting. Values: true | false
+      "fieldGrouping": "disabled", // Kiku duplicate-card field grouping mode. Values: auto | manual | disabled
+      "deleteDuplicateInAuto": true // Delete duplicate in auto setting. Values: true | false
+    } // Is kiku setting.
+  }, // Automatic Anki updates and media generation options.
+
+  // ==========================================
+  // Jimaku
+  // Jimaku API configuration and defaults.
+  // ==========================================
+  "jimaku": {
+    "apiBaseUrl": "https://jimaku.cc", // Api base url setting.
+    "languagePreference": "ja", // Preferred language used in Jimaku search. Values: ja | en | none
+    "maxEntryResults": 10 // Maximum Jimaku search results returned.
+  }, // Jimaku API configuration and defaults.
+
+  // ==========================================
+  // YouTube Subtitle Generation
+  // Defaults for subminer YouTube subtitle extraction/transcription mode.
+  // ==========================================
+  "youtubeSubgen": {
+    "mode": "automatic", // YouTube subtitle generation mode for the launcher script. Values: automatic | preprocess | off
+    "whisperBin": "", // Path to whisper.cpp CLI used as fallback transcription engine.
+    "whisperModel": "", // Path to whisper model used for fallback transcription.
+    "primarySubLanguages": [
+      "ja",
+      "jpn"
+    ] // Comma-separated primary subtitle language priority used by the launcher.
+  }, // Defaults for subminer YouTube subtitle extraction/transcription mode.
+
+  // ==========================================
+  // Anilist
+  // Anilist API credentials and update behavior.
+  // ==========================================
+  "anilist": {
+    "enabled": false, // Enable AniList post-watch progress updates. Values: true | false
+    "accessToken": "" // Optional explicit AniList access token override; leave empty to use locally stored token from setup.
+  }, // Anilist API credentials and update behavior.
+
+  // ==========================================
+  // Jellyfin
+  // Optional Jellyfin integration for auth, browsing, and playback launch.
+  // Access token is stored in local encrypted token storage after login/setup.
+  // jellyfin.accessToken remains an optional explicit override in config.
+  // ==========================================
+  "jellyfin": {
+    "enabled": false, // Enable optional Jellyfin integration and CLI control commands. Values: true | false
+    "serverUrl": "", // Base Jellyfin server URL (for example: http://localhost:8096).
+    "username": "", // Default Jellyfin username used during CLI login.
+    "deviceId": "subminer", // Device id setting.
+    "clientName": "SubMiner", // Client name setting.
+    "clientVersion": "0.1.0", // Client version setting.
+    "defaultLibraryId": "", // Optional default Jellyfin library ID for item listing.
+    "remoteControlEnabled": true, // Enable Jellyfin remote cast control mode. Values: true | false
+    "remoteControlAutoConnect": true, // Auto-connect to the configured remote control target. Values: true | false
+    "autoAnnounce": false, // When enabled, automatically trigger remote announce/visibility check on websocket connect. Values: true | false
+    "remoteControlDeviceName": "SubMiner", // Device name reported for Jellyfin remote control sessions.
+    "pullPictures": false, // Enable Jellyfin poster/icon fetching for launcher menus. Values: true | false
+    "iconCacheDir": "/tmp/subminer-jellyfin-icons", // Directory used by launcher for cached Jellyfin poster icons.
+    "directPlayPreferred": true, // Try direct play before server-managed transcoding when possible. Values: true | false
+    "directPlayContainers": [
+      "mkv",
+      "mp4",
+      "webm",
+      "mov",
+      "flac",
+      "mp3",
+      "aac"
+    ], // Container allowlist for direct play decisions.
+    "transcodeVideoCodec": "h264" // Preferred transcode video codec when direct play is unavailable.
+  }, // Optional Jellyfin integration for auth, browsing, and playback launch.
+
+  // ==========================================
+  // Discord Rich Presence
+  // Optional Discord Rich Presence activity card updates for current playback/study session.
+  // Uses official SubMiner Discord app assets for polished card visuals.
+  // ==========================================
+  "discordPresence": {
+    "enabled": false, // Enable optional Discord Rich Presence updates. Values: true | false
+    "updateIntervalMs": 3000, // Minimum interval between presence payload updates.
+    "debounceMs": 750 // Debounce delay used to collapse bursty presence updates.
+  }, // Optional Discord Rich Presence activity card updates for current playback/study session.
+
+  // ==========================================
+  // Immersion Tracking
+  // Enable/disable immersion tracking.
+  // Set dbPath to override the default sqlite database location.
+  // Policy tuning is available for queue, flush, and retention values.
+  // ==========================================
+  "immersionTracking": {
+    "enabled": true, // Enable immersion tracking for mined subtitle metadata. Values: true | false
+    "dbPath": "", // Optional SQLite database path for immersion tracking. Empty value uses the default app data path.
+    "batchSize": 25, // Buffered telemetry/event writes per SQLite transaction.
+    "flushIntervalMs": 500, // Max delay before queue flush in milliseconds.
+    "queueCap": 1000, // In-memory write queue cap before overflow policy applies.
+    "payloadCapBytes": 256, // Max JSON payload size per event before truncation.
+    "maintenanceIntervalMs": 86400000, // Maintenance cadence (prune + rollup + vacuum checks).
+    "retention": {
+      "eventsDays": 7, // Raw event retention window in days.
+      "telemetryDays": 30, // Telemetry retention window in days.
+      "dailyRollupsDays": 365, // Daily rollup retention window in days.
+      "monthlyRollupsDays": 1825, // Monthly rollup retention window in days.
+      "vacuumIntervalDays": 7 // Minimum days between VACUUM runs.
+    } // Retention setting.
+  } // Enable/disable immersion tracking.
+}
diff --git a/docs/.vitepress/config.ts b/docs/.vitepress/config.ts
new file mode 100644
index 0000000..84f2c71
--- /dev/null
+++ b/docs/.vitepress/config.ts
@@ -0,0 +1,98 @@
+const repositoryName = process.env.GITHUB_REPOSITORY?.split('/')[1];
+const base = process.env.GITHUB_ACTIONS && repositoryName ? `/${repositoryName}/` : '/';
+
+export default {
+  title: 'SubMiner Docs',
+  description:
+    'SubMiner: an MPV immersion-mining overlay with Yomitan and AnkiConnect integration.',
+  base,
+  head: [
+    ['link', { rel: 'icon', href: '/favicon.ico', sizes: 'any' }],
+    [
+      'link',
+      {
+        rel: 'icon',
+        type: 'image/png',
+        href: '/favicon-32x32.png',
+        sizes: '32x32',
+      },
+    ],
+    [
+      'link',
+      {
+        rel: 'icon',
+        type: 'image/png',
+        href: '/favicon-16x16.png',
+        sizes: '16x16',
+      },
+    ],
+    [
+      'link',
+      {
+        rel: 'apple-touch-icon',
+        href: '/apple-touch-icon.png',
+        sizes: '180x180',
+      },
+    ],
+  ],
+  appearance: 'dark',
+  cleanUrls: true,
+  lastUpdated: true,
+  srcExclude: ['subagents/**'],
+  markdown: {
+    theme: {
+      light: 'catppuccin-latte',
+      dark: 'catppuccin-macchiato',
+    },
+  },
+  themeConfig: {
+    logo: {
+      light: '/assets/SubMiner.png',
+      dark: '/assets/SubMiner.png',
+    },
+    siteTitle: 'SubMiner Docs',
+    nav: [
+      { text: 'Home', link: '/' },
+      { text: 'Get Started', link: '/installation' },
+      { text: 'Mining', link: '/mining-workflow' },
+      { text: 'Configuration', link: '/configuration' },
+      { text: 'Troubleshooting', link: '/troubleshooting' },
+    ],
+    sidebar: [
+      {
+        text: 'Getting Started',
+        items: [
+          { text: 'Overview', link: '/' },
+          { text: 'Installation', link: '/installation' },
+          { text: 'Launcher Script', link: '/launcher-script' },
+          { text: 'Usage', link: '/usage' },
+          { text: 'Mining Workflow', link: '/mining-workflow' },
+        ],
+      },
+      {
+        text: 'Reference',
+        items: [
+          { text: 'Configuration', link: '/configuration' },
+          { text: 'Keyboard Shortcuts', link: '/shortcuts' },
+          { text: 'Anki Integration', link: '/anki-integration' },
+          { text: 'Jellyfin Integration', link: '/jellyfin-integration' },
+          { text: 'Immersion Tracking', link: '/immersion-tracking' },
+          { text: 'JLPT Vocabulary', link: '/jlpt-vocab-bundle' },
+          { text: 'MPV Plugin', link: '/mpv-plugin' },
+          { text: 'Troubleshooting', link: '/troubleshooting' },
+        ],
+      },
+      {
+        text: 'Development',
+        items: [
+          { text: 'Building & Testing', link: '/development' },
+          { text: 'Architecture', link: '/architecture' },
+        ],
+      },
+    ],
+    search: {
+      provider: 'local',
+    },
+    socialLinks: [{ icon: 'github', link: 'https://github.com/ksyasuda/SubMiner' }],
+  },
+};
diff --git a/docs/.vitepress/theme/index.ts b/docs/.vitepress/theme/index.ts
new file mode 100644
index 0000000..ee87a73
--- /dev/null
+++ b/docs/.vitepress/theme/index.ts
@@ -0,0 +1,194 @@
+import DefaultTheme from 'vitepress/theme';
+import { useRoute } from 'vitepress';
+import { nextTick, onMounted, watch } from 'vue';
+import '@catppuccin/vitepress/theme/macchiato/mauve.css';
+import './mermaid-modal.css';
+
+let mermaidLoader: Promise<any> | null = null;
+const MERMAID_MODAL_ID = 'mermaid-diagram-modal';
+
+function closeMermaidModal() {
+  if (typeof document === 'undefined') {
+    return;
+  }
+
+  const modal = document.getElementById(MERMAID_MODAL_ID);
+  if (!modal) {
+    return;
+  }
+
+  modal.classList.remove('is-open');
+  document.body.classList.remove('mermaid-modal-open');
+}
+
+function ensureMermaidModal(): HTMLDivElement {
+  const existing = document.getElementById(MERMAID_MODAL_ID);
+  if (existing) {
+    return existing as HTMLDivElement;
+  }
+
+  const modal = document.createElement('div');
+  modal.id = MERMAID_MODAL_ID;
+  modal.className = 'mermaid-modal';
+  modal.innerHTML = `
+    <div class="mermaid-modal__backdrop" data-mermaid-close="true"></div>
+    <div class="mermaid-modal__dialog" role="dialog" aria-modal="true" aria-label="Expanded Mermaid diagram">
+      <button class="mermaid-modal__close" type="button" aria-label="Close Mermaid diagram">Close</button>
+      <div class="mermaid-modal__content"></div>
+    </div>
+  `;
+
+  modal.addEventListener('click', (event) => {
+    const target = event.target as HTMLElement | null;
+    if (!target) {
+      return;
+    }
+
+    if (target.closest('[data-mermaid-close="true"]') || target.closest('.mermaid-modal__close')) {
+      closeMermaidModal();
+    }
+  });
+
+  document.addEventListener('keydown', (event) => {
+    if (event.key === 'Escape' && modal.classList.contains('is-open')) {
+      closeMermaidModal();
+    }
+  });
+
+  document.body.appendChild(modal);
+  return modal;
+}
+
+function openMermaidModal(sourceNode: HTMLElement) {
+  if (typeof document === 'undefined') {
+    return;
+  }
+
+  const modal = ensureMermaidModal();
+  const content = modal.querySelector<HTMLDivElement>('.mermaid-modal__content');
+  if (!content) {
+    return;
+  }
+
+  content.replaceChildren(sourceNode.cloneNode(true));
+  modal.classList.add('is-open');
+  document.body.classList.add('mermaid-modal-open');
+}
+
+function attachMermaidInteractions(nodes: HTMLElement[]) {
+  for (const node of nodes) {
+    if (node.dataset.mermaidInteractive === 'true') {
+      continue;
+    }
+
+    const svg = node.querySelector<HTMLElement>('svg');
+    if (!svg) {
+      continue;
+    }
+
+    node.classList.add('mermaid-interactive');
+    node.setAttribute('role', 'button');
+    node.setAttribute('tabindex', '0');
+    node.setAttribute('aria-label', 'Open Mermaid diagram in full view');
+
+    const open = () => openMermaidModal(svg);
+    node.addEventListener('click', open);
+    node.addEventListener('keydown', (event) => {
+      if (event.key === 'Enter' || event.key === ' ') {
+        event.preventDefault();
+        open();
+      }
+    });
+
+    node.dataset.mermaidInteractive = 'true';
+  }
+}
+
+async function getMermaid() {
+  if (!mermaidLoader) {
+    mermaidLoader = import('mermaid').then((module) => {
+      const mermaid = module.default;
+      mermaid.initialize({
+        startOnLoad: false,
+        securityLevel: 'loose',
+        theme: 'base',
+        themeVariables: {
+          background: '#24273a',
+          primaryColor: '#363a4f',
+          primaryTextColor: '#cad3f5',
+          primaryBorderColor: '#c6a0f6',
+          secondaryColor: '#494d64',
+          secondaryTextColor: '#cad3f5',
+          secondaryBorderColor: '#b7bdf8',
+          tertiaryColor: '#5b6078',
+          tertiaryTextColor: '#cad3f5',
+          tertiaryBorderColor: '#8aadf4',
+          lineColor: '#939ab7',
+          textColor: '#cad3f5',
+          mainBkg: '#363a4f',
+          nodeBorder: '#c6a0f6',
+          clusterBkg: '#1e2030',
+          clusterBorder: '#494d64',
+          edgeLabelBackground: '#24273a',
+          labelTextColor: '#cad3f5',
+        },
+      });
+      return mermaid;
+    });
+  }
+  return mermaidLoader;
+}
+
+async function renderMermaidBlocks() {
+  if (typeof document === 'undefined') {
+    return;
+  }
+  const blocks = Array.from(document.querySelectorAll<HTMLElement>('div.language-mermaid'));
+  if (blocks.length === 0) {
+    return;
+  }
+
+  const mermaid = await getMermaid();
+  const nodes: HTMLElement[] = [];
+
+  for (const block of blocks) {
+    if (block.dataset.mermaidRendered === 'true') {
+      continue;
+    }
+    const code = block.querySelector('pre code');
+    const source = code?.textContent?.trim();
+    if (!source) {
+      continue;
+    }
+
+    const mount = document.createElement('div');
+    mount.className = 'mermaid';
+    mount.textContent = source;
+
+    block.replaceChildren(mount);
+    block.dataset.mermaidRendered = 'true';
+    nodes.push(mount);
+  }
+
+  if (nodes.length > 0) {
+    await mermaid.run({ nodes });
+    attachMermaidInteractions(nodes);
+  }
+}
+
+export default {
+  ...DefaultTheme,
+  setup() {
+    const route = useRoute();
+    const render = () => {
+      nextTick(() => {
+        renderMermaidBlocks().catch((error) => {
+          console.error('Failed to render Mermaid diagram:', error);
+        });
+      });
+    };
+
+    onMounted(render);
+    watch(() => route.path, render);
+  },
+};
diff --git a/docs/.vitepress/theme/mermaid-modal.css b/docs/.vitepress/theme/mermaid-modal.css
new file mode 100644
index 0000000..0c844d2
--- /dev/null
+++ b/docs/.vitepress/theme/mermaid-modal.css
@@ -0,0 +1,69 @@
+.mermaid-interactive {
+  cursor: zoom-in;
+}
+
+.mermaid-interactive:focus-visible {
+  outline: 2px solid var(--vp-c-brand-1);
+  outline-offset: 4px;
+  border-radius: 6px;
+}
+
+.mermaid-modal {
+  position: fixed;
+  inset: 0;
+  z-index: 200;
+  display: none;
+}
+
+.mermaid-modal.is-open {
+  display: block;
+}
+
+.mermaid-modal__backdrop {
+  position: absolute;
+  inset: 0;
+  background: rgba(0, 0, 0, 0.72);
+}
+
+.mermaid-modal__dialog {
+  position: relative;
+  z-index: 1;
+  margin: 4vh auto;
+  width: min(96vw, 1800px);
+  max-height: 92vh;
+  border: 1px solid var(--vp-c-border);
+  border-radius: 12px;
+  background: var(--vp-c-bg);
+  box-shadow: var(--vp-shadow-4);
+  overflow: hidden;
+}
+
+.mermaid-modal__close {
+  display: block;
+  margin-left: auto;
+  margin-right: 16px;
+  margin-top: 12px;
+  border: 1px solid var(--vp-c-border);
+  border-radius: 6px;
+  padding: 4px 10px;
+  background: var(--vp-c-bg-soft);
+  color: var(--vp-c-text-1);
+  font-size: 14px;
+}
+
+.mermaid-modal__content {
+  overflow: auto;
+  max-height: calc(92vh - 56px);
+  padding: 8px 16px 16px;
+}
+
+.mermaid-modal__content svg {
+  max-width: none;
+  width: max-content;
+  height: auto;
+  min-width: 100%;
+}
+
+body.mermaid-modal-open {
+  overflow: hidden;
+}
diff --git a/docs/README.md b/docs/README.md
new file mode 100644
index 0000000..34845a0
--- /dev/null
+++ b/docs/README.md
@@ -0,0 +1,35 @@
+# Documentation
+
+SubMiner documentation is built with [VitePress](https://vitepress.dev/).
+
+## Local Docs Site
+
+```bash
+make docs-dev     # Dev server at http://localhost:5173
+make docs         # Build static output
+make docs-preview # Preview built site at http://localhost:4173
+```
+
+## Pages
+
+### Getting Started
+
+- [Installation](/installation) — Requirements, Linux/macOS/Windows install, mpv plugin setup
+- [Usage](/usage) — `subminer` wrapper + subcommands (`jellyfin`, `yt`, `doctor`, `config`, `mpv`, `texthooker`, `app`), mpv plugin, keybindings
+- [Mining Workflow](/mining-workflow) — End-to-end sentence mining guide, overlay layers, card creation
+
+### Reference
+
+- [Configuration](/configuration) — Full config file reference and option details
+- [Keyboard Shortcuts](/shortcuts) — All global, overlay, mining, and plugin chord shortcuts in one place
+- [Anki Integration](/anki-integration) — AnkiConnect setup, field mapping, media generation, field grouping
+- [Jellyfin Integration](/jellyfin-integration) — Optional Jellyfin auth, cast discovery, remote control, and playback launch
+- [Immersion Tracking](/immersion-tracking) — SQLite schema, retention/rollup policies, query templates, and extension points
+- [JLPT Vocabulary](/jlpt-vocab-bundle) — Bundled term-meta bank for JLPT level underlining and frequency highlighting
+- [MPV Plugin](/mpv-plugin) — Chord keybindings, subminer.conf options, script messages
+- [Troubleshooting](/troubleshooting) — Common issues and solutions by category
+
+### Development
+
+- [Building & Testing](/development) — Build commands, test suites, contributor notes, environment variables
+- [Architecture](/architecture) — Service-oriented design, composition model, renderer module layout
diff --git a/docs/anki-integration.md b/docs/anki-integration.md
new file mode 100644
index 0000000..51a0e8f
--- /dev/null
+++ b/docs/anki-integration.md
@@ -0,0 +1,258 @@
+# Anki Integration
+
+SubMiner uses the [AnkiConnect](https://ankiweb.net/shared/info/2055492159) add-on to create and update Anki cards with sentence context, audio, and screenshots.
+
+## Prerequisites
+
+1. Install [Anki](https://apps.ankiweb.net/).
+2. Install the [AnkiConnect](https://ankiweb.net/shared/info/2055492159) add-on (code: `2055492159`).
+3. Keep Anki running while using SubMiner.
+
+AnkiConnect listens on `http://127.0.0.1:8765` by default. If you changed the port in AnkiConnect's settings, update `ankiConnect.url` in your SubMiner config.
+
+## How Polling Works
+
+SubMiner polls AnkiConnect at a regular interval (default: 3 seconds, configurable via `ankiConnect.pollingRate`) to detect new cards. When it finds a card that was added since the last poll:
+
+1. Checks if a duplicate expression already exists (for field grouping).
+2. Updates the sentence field with the current subtitle.
+3. Generates and uploads audio and image media.
+4. Fills the translation field from the secondary subtitle or AI.
+5. Writes metadata to the miscInfo field.
+
+Polling uses the query `"deck:<your-deck>" added:1` to find recently added cards. If no deck is configured, it searches all decks.
+
+## Field Mapping
+
+SubMiner maps its data to your Anki note fields. Configure these under `ankiConnect.fields`:
+
+```jsonc
+"ankiConnect": {
+  "fields": {
+    "audio": "ExpressionAudio",    // audio clip from the video
+    "image": "Picture",             // screenshot or animated clip
+    "sentence": "Sentence",         // subtitle text
+    "miscInfo": "MiscInfo",         // metadata (filename, timestamp)
+    "translation": "SelectionText"  // secondary sub or AI translation
+  }
+}
+```
+
+Field names must match your Anki note type exactly (case-sensitive). If a configured field does not exist on the note type, SubMiner skips it without error.
+
+### Minimal Config
+
+If you only want sentence and audio on your cards:
+
+```jsonc
+"ankiConnect": {
+  "enabled": true,
+  "fields": {
+    "sentence": "Sentence",
+    "audio": "ExpressionAudio"
+  }
+}
+```
+
+## Media Generation
+
+SubMiner uses FFmpeg to generate audio and image media from the video. FFmpeg must be installed and on `PATH`.
+
+### Audio
+
+Audio is extracted from the video file using the subtitle's start and end timestamps, with configurable padding added before and after.
+
+```jsonc
+"ankiConnect": {
+  "media": {
+    "generateAudio": true,
+    "audioPadding": 0.5,         // seconds before and after subtitle timing
+    "maxMediaDuration": 30       // cap total duration in seconds
+  }
+}
+```
+
+Output format: MP3 at 44100 Hz. If the video has multiple audio streams, SubMiner uses the active stream.
+
+The audio is uploaded to Anki's media folder and inserted as `[sound:audio_<timestamp>.mp3]`.
+
+### Screenshots (Static)
+
+A single frame is captured at the current playback position.
+
+```jsonc
+"ankiConnect": {
+  "media": {
+    "generateImage": true,
+    "imageType": "static",
+    "imageFormat": "jpg",        // "jpg", "png", or "webp"
+    "imageQuality": 92,          // 1–100
+    "imageMaxWidth": null,       // optional, preserves aspect ratio
+    "imageMaxHeight": null
+  }
+}
+```
+
+### Animated Clips (AVIF)
+
+Instead of a static screenshot, SubMiner can generate an animated AVIF covering the subtitle duration.
+
+```jsonc
+"ankiConnect": {
+  "media": {
+    "generateImage": true,
+    "imageType": "avif",
+    "animatedFps": 10,
+    "animatedMaxWidth": 640,
+    "animatedMaxHeight": null,
+    "animatedCrf": 35            // 0–63, lower = better quality
+  }
+}
+```
+
+Animated AVIF requires an AV1 encoder (`libaom-av1`, `libsvtav1`, or `librav1e`) in your FFmpeg build. Generation timeout is 60 seconds.
+
+### Behavior Options
+
+```jsonc
+"ankiConnect": {
+  "behavior": {
+    "overwriteAudio": true,         // replace existing audio, or append
+    "overwriteImage": true,         // replace existing image, or append
+    "mediaInsertMode": "append",    // "append" or "prepend" to field content
+    "autoUpdateNewCards": true,     // auto-update when new card detected
+    "notificationType": "osd"       // "osd", "system", "both", or "none"
+  }
+}
+```
+
+## AI Translation
+
+SubMiner can auto-translate the mined sentence and fill the translation field. By default, if a secondary subtitle track is available, its text is used. When AI is enabled, SubMiner calls an LLM API instead.
+
+```jsonc
+"ankiConnect": {
+  "ai": {
+    "enabled": true,
+    "alwaysUseAiTranslation": false,  // true = ignore secondary sub
+    "apiKey": "sk-...",
+    "model": "openai/gpt-4o-mini",
+    "baseUrl": "https://openrouter.ai/api",
+    "targetLanguage": "English",
+    "systemPrompt": "You are a translation engine. Return only the translation."
+  }
+}
+```
+
+Translation priority:
+
+1. If `alwaysUseAiTranslation` is `true`, always call the AI API.
+2. If a secondary subtitle is available, use it as the translation.
+3. If AI is enabled and no secondary subtitle exists, call the AI API.
+4. Otherwise, leave the field empty.
+
+## Sentence Cards (Lapis)
+
+SubMiner can create standalone sentence cards (without a word/expression) using a separate note type. This is designed for use with [Lapis](https://github.com/donkuri/Lapis) and similar sentence-focused note types.
+
+```jsonc
+"ankiConnect": {
+  "isLapis": {
+    "enabled": true,
+    "sentenceCardModel": "Japanese sentences"
+  }
+}
+```
+
+Trigger with the mine sentence shortcut (`Ctrl/Cmd+S` by default). The card is created directly via AnkiConnect with the sentence, audio, and image filled in.
+
+To mine multiple subtitle lines as one sentence card, use `Ctrl/Cmd+Shift+S` followed by a digit (1–9) to select how many recent lines to combine.
+
+## Field Grouping (Kiku)
+
+When you mine the same word multiple times, SubMiner can merge the cards instead of creating duplicates. This is designed for note types like [Kiku](https://github.com/youyoumu/kiku) that support grouped sentence/audio/image fields.
+
+```jsonc
+"ankiConnect": {
+  "isKiku": {
+    "enabled": true,
+    "fieldGrouping": "manual",         // "auto", "manual", or "disabled"
+    "deleteDuplicateInAuto": true      // delete new card after auto-merge
+  }
+}
+```
+
+### Modes
+
+**Disabled** (`"disabled"`): No duplicate detection. Each card is independent.
+
+**Auto** (`"auto"`): When a duplicate expression is found, SubMiner merges the new card into the existing one automatically. Both sentences, audio clips, and images are preserved. If `deleteDuplicateInAuto` is true, the new card is deleted after merging.
+
+**Manual** (`"manual"`): A modal appears in the overlay showing both cards. You choose which card to keep, preview the merge result, then confirm. The modal has a 90-second timeout, after which it cancels automatically.
+
+### What Gets Merged
+
+| Field    | Merge behavior                                                 |
+| -------- | -------------------------------------------------------------- |
+| Sentence | Both sentences preserved, labeled `[Original]` / `[Duplicate]` |
+| Audio    | Both `[sound:...]` entries kept                                |
+| Image    | Both images kept                                               |
+
+### Keyboard Shortcuts in the Modal
+
+| Key       | Action                             |
+| --------- | ---------------------------------- |
+| `1` / `2` | Select card 1 or card 2 to keep    |
+| `Enter`   | Confirm selection                  |
+| `Esc`     | Cancel (keep both cards unchanged) |
+
+## Full Config Example
+
+```jsonc
+{
+  "ankiConnect": {
+    "enabled": true,
+    "url": "http://127.0.0.1:8765",
+    "pollingRate": 3000,
+    "fields": {
+      "audio": "ExpressionAudio",
+      "image": "Picture",
+      "sentence": "Sentence",
+      "miscInfo": "MiscInfo",
+      "translation": "SelectionText",
+    },
+    "media": {
+      "generateAudio": true,
+      "generateImage": true,
+      "imageType": "static",
+      "imageFormat": "jpg",
+      "imageQuality": 92,
+      "audioPadding": 0.5,
+      "maxMediaDuration": 30,
+    },
+    "behavior": {
+      "overwriteAudio": true,
+      "overwriteImage": true,
+      "mediaInsertMode": "append",
+      "autoUpdateNewCards": true,
+      "notificationType": "osd",
+    },
+    "ai": {
+      "enabled": false,
+      "apiKey": "",
+      "model": "openai/gpt-4o-mini",
+      "baseUrl": "https://openrouter.ai/api",
+      "targetLanguage": "English",
+    },
+    "isKiku": {
+      "enabled": false,
+      "fieldGrouping": "disabled",
+      "deleteDuplicateInAuto": true,
+    },
+    "isLapis": {
+      "enabled": false,
+      "sentenceCardModel": "Japanese sentences",
+    },
+  },
+}
+```
diff --git a/docs/architecture.md b/docs/architecture.md
new file mode 100644
index 0000000..90084da
--- /dev/null
+++ b/docs/architecture.md
@@ -0,0 +1,359 @@
+# Architecture
+
+SubMiner is split into three cooperating runtimes:
+
+- Electron desktop app (`src/`) for overlay/UI/runtime orchestration.
+- Launcher CLI (`launcher/`) for mpv/app command workflows.
+- mpv Lua plugin (`plugin/subminer.lua`) for player-side controls and IPC handoff.
+
+Within the desktop app, `src/main.ts` is a composition root that wires small runtime/domain modules plus core services.
+
+## Goals
+
+- Keep behavior stable while reducing coupling.
+- Prefer small, single-purpose units that can be tested in isolation.
+- Keep `main.ts` focused on wiring and state ownership, not implementation detail.
+- Follow Unix-style composability:
+  - each service does one job
+  - services compose through explicit inputs/outputs
+  - orchestration is separate from implementation
+
+## Project Structure
+
+```text
+launcher/                 # Standalone CLI launcher wrapper and mpv helpers
+  commands/               # Command modules (doctor/config/mpv/jellyfin/playback/app passthrough)
+  config/                 # Launcher config parsers + CLI parser builder
+  main.ts                 # Launcher entrypoint and command dispatch
+plugin/
+  subminer.lua            # mpv plugin (auto-start, IPC, AniSkip + hover controls)
+src/
+  main-entry.ts           # Background-mode bootstrap wrapper before loading main.js
+  main.ts                  # Entry point — delegates to runtime composers/domain modules
+  preload.ts               # Electron preload bridge
+  types.ts                 # Shared type definitions
+  main/                    # Main-process composition/runtime adapters
+    app-lifecycle.ts       # App lifecycle + app-ready runtime runner factories
+    cli-runtime.ts         # CLI command runtime service adapters
+    config-validation.ts   # Startup/hot-reload config error formatting and fail-fast helpers
+    dependencies.ts        # Shared dependency builders for IPC/runtime services
+    ipc-runtime.ts         # IPC runtime registration wrappers
+    overlay-runtime.ts     # Overlay modal routing + active-window selection
+    overlay-shortcuts-runtime.ts # Overlay keyboard shortcut handling
+    overlay-visibility-runtime.ts # Overlay visibility + tracker-driven bounds service
+    frequency-dictionary-runtime.ts # Frequency dictionary runtime adapter
+    jlpt-runtime.ts         # JLPT dictionary runtime adapter
+    media-runtime.ts        # Media path/title/subtitle-position runtime service
+    startup.ts              # Startup bootstrap dependency builder
+    startup-lifecycle.ts    # Lifecycle runtime runner adapter
+    state.ts                # Application runtime state container + reducer transitions
+    subsync-runtime.ts      # Subsync command runtime adapter
+    runtime/
+      composers/            # High-level composition clusters used by main.ts
+      domains/              # Domain barrel exports (startup/overlay/mpv/jellyfin/...)
+      registry.ts           # Domain registry consumed by main.ts
+  core/
+    services/              # Focused runtime services (Electron adapters + pure logic)
+      anilist/             # AniList token store/update queue/update helpers
+      immersion-tracker/   # Immersion persistence/session/metadata modules
+      tokenizer/           # Tokenizer stage modules (selection/enrichment/annotation)
+    utils/                 # Pure helpers and coercion/config utilities
+  cli/                     # CLI parsing and help output
+  config/                  # Config defaults/definitions, loading, parse, resolution pipeline
+    definitions/           # Domain-specific defaults + option registries
+    resolve/               # Domain-specific config resolution pipeline stages
+  shared/ipc/              # Cross-process IPC channel constants + payload validators
+  renderer/                # Overlay renderer (modularized UI/runtime)
+    handlers/              # Keyboard/mouse interaction modules
+    modals/                # Jimaku/Kiku/subsync/runtime-options/session-help modals
+    positioning/           # Invisible-layer layout + offset controllers
+  window-trackers/         # Backend-specific tracker implementations (Hyprland, Sway, X11, macOS)
+  jimaku/                  # Jimaku API integration helpers
+  subsync/                 # Subtitle sync (alass/ffsubsync) helpers
+  subtitle/                # Subtitle processing utilities
+  tokenizers/              # Tokenizer implementations
+  token-mergers/           # Token merge strategies
+  translators/             # AI translation providers
+```
+
+### Service Layer (`src/core/services/`)
+
+- **Overlay/window runtime:** `overlay-manager.ts`, `overlay-window.ts`, `overlay-window-geometry.ts`, `overlay-visibility.ts`, `overlay-bridge.ts`, `overlay-runtime-init.ts`, `overlay-content-measurement.ts`, `overlay-drop.ts`
+- **Shortcuts/input:** `shortcut.ts`, `overlay-shortcut.ts`, `overlay-shortcut-handler.ts`, `shortcut-fallback.ts`, `numeric-shortcut.ts`
+- **MPV runtime:** `mpv.ts`, `mpv-transport.ts`, `mpv-protocol.ts`, `mpv-properties.ts`, `mpv-render-metrics.ts`
+- **Mining + Anki/Jimaku runtime:** `mining.ts`, `field-grouping.ts`, `field-grouping-overlay.ts`, `anki-jimaku.ts`, `anki-jimaku-ipc.ts`
+- **Subtitle/token pipeline:** `subtitle-processing-controller.ts`, `subtitle-position.ts`, `subtitle-ws.ts`, `tokenizer.ts` + `tokenizer/*` stage modules
+- **Integrations:** `jimaku.ts`, `subsync.ts`, `subsync-runner.ts`, `texthooker.ts`, `jellyfin.ts`, `jellyfin-remote.ts`, `discord-presence.ts`, `yomitan-extension-loader.ts`, `yomitan-settings.ts`
+- **Config/runtime controls:** `config-hot-reload.ts`, `runtime-options-ipc.ts`, `cli-command.ts`, `startup.ts`
+- **Domain submodules:** `anilist/*` (token/update queue/updater), `immersion-tracker/*` (storage/session/metadata/query/reducer)
+
+### Renderer Layer (`src/renderer/`)
+
+The renderer keeps `renderer.ts` focused on orchestration. UI behavior is delegated to per-concern modules.
+
+```text
+src/renderer/
+  renderer.ts              # Entrypoint/orchestration only
+  context.ts               # Shared runtime context contract
+  state.ts                 # Centralized renderer mutable state
+  error-recovery.ts        # Global renderer error boundary + recovery actions
+  overlay-content-measurement.ts # Reports rendered bounds to main process
+  subtitle-render.ts       # Primary/secondary subtitle rendering + style application
+  positioning.ts           # Facade export for positioning controller
+  positioning/
+    controller.ts          # Position controller orchestration
+    invisible-layout*.ts   # Invisible layer layout computations
+    position-state.ts      # Position state helpers
+  handlers/
+    keyboard.ts            # Keybindings, chord handling, modal key routing
+    mouse.ts               # Hover/drag behavior, selection + observer wiring
+  modals/
+    jimaku.ts              # Jimaku modal flow
+    kiku.ts                # Kiku field-grouping modal flow
+    runtime-options.ts     # Runtime options modal flow
+    session-help.ts        # Keyboard shortcuts/help modal flow
+    subsync.ts             # Manual subsync modal flow
+  utils/
+    dom.ts                 # Required DOM lookups + typed handles
+    platform.ts            # Layer/platform capability detection
+```
+
+### Launcher + Plugin Runtimes
+
+- `launcher/main.ts` dispatches commands through `launcher/commands/*` and shared config readers in `launcher/config/*`. It handles mpv startup, app passthrough, Jellyfin helper commands, and playback handoff.
+- `plugin/subminer.lua` runs inside mpv and handles IPC startup checks, overlay toggles, hover-token messages, and AniSkip intro-skip UX.
+
+## Flow Diagram
+
+The main process has three layers: `main.ts` delegates to composition modules that wire together domain services. Three overlay windows (visible, invisible, secondary) run in separate Electron renderer processes, connected through `preload.ts`. External runtimes (launcher CLI and mpv plugin) operate independently and communicate via IPC socket or CLI passthrough.
+
+```mermaid
+flowchart LR
+  classDef entry fill:#c6a0f6,stroke:#494d64,color:#24273a,stroke-width:2px,font-weight:bold
+  classDef comp fill:#b7bdf8,stroke:#494d64,color:#24273a,stroke-width:1.5px
+  classDef svc fill:#8aadf4,stroke:#494d64,color:#24273a,stroke-width:1.5px
+  classDef bridge fill:#f5a97f,stroke:#494d64,color:#24273a,stroke-width:1.5px
+  classDef rend fill:#8bd5ca,stroke:#494d64,color:#24273a,stroke-width:1.5px
+  classDef ext fill:#a6da95,stroke:#494d64,color:#24273a,stroke-width:1.5px
+  classDef extrt fill:#eed49f,stroke:#494d64,color:#24273a,stroke-width:1.5px
+
+  subgraph ExtRt["External Runtimes"]
+    Launcher["launcher/<br/>CLI dispatch"]:::extrt
+    Plugin["subminer.lua<br/>mpv plugin"]:::extrt
+  end
+
+  subgraph Ext["External Systems"]
+    mpvExt["mpv player"]:::ext
+    AnkiExt["AnkiConnect"]:::ext
+    JimakuExt["Jimaku API"]:::ext
+    TrackerExt["Window Tracker<br/>Hyprland · Sway<br/>X11 · macOS"]:::ext
+    AnilistExt["AniList API"]:::ext
+    JellyfinExt["Jellyfin"]:::ext
+    DiscordExt["Discord RPC"]:::ext
+  end
+
+  Main["main.ts<br/>composition root"]:::entry
+
+  subgraph Comp["Composition — src/main/"]
+    Startup["Startup & Lifecycle<br/>startup · app-lifecycle<br/>startup-lifecycle · state"]:::comp
+    Wiring["Runtime Wiring<br/>ipc-runtime · cli-runtime<br/>overlay-runtime"]:::comp
+    Composers["Composers<br/>mpv · anilist<br/>jellyfin"]:::comp
+  end
+
+  subgraph Svc["Services — src/core/services/"]
+    Mpv["MPV Stack<br/>transport · protocol<br/>properties · metrics"]:::svc
+    Overlay["Overlay Manager<br/>window · geometry<br/>visibility · bridge"]:::svc
+    Mining["Mining & Subtitles<br/>mining · field-grouping<br/>subtitle-ws · tokenizer"]:::svc
+    Integrations["Integrations<br/>jimaku · subsync<br/>texthooker · yomitan"]:::svc
+    Tracking["Tracking<br/>anilist · jellyfin<br/>immersion · discord"]:::svc
+    Config["Config & Runtime<br/>hot-reload<br/>runtime-options"]:::svc
+  end
+
+  Bridge(["preload.ts<br/>Electron IPC"]):::bridge
+
+  subgraph Rend["Renderer — src/renderer/"]
+    Visible["Visible window<br/>Yomitan lookups"]:::rend
+    Invisible["Invisible window<br/>mpv positioning"]:::rend
+    Secondary["Secondary window<br/>subtitle bar"]:::rend
+    UI["subtitle-render<br/>positioning<br/>handlers · modals"]:::rend
+  end
+
+  Launcher -->|"CLI"| Main
+  Plugin -->|"IPC"| mpvExt
+
+  Main --> Comp
+  Comp --> Svc
+
+  mpvExt <-->|"JSON socket"| Mpv
+  AnkiExt <-->|"HTTP"| Mining
+  JimakuExt <-->|"HTTP"| Integrations
+  TrackerExt <-->|"platform"| Overlay
+  AnilistExt <-->|"HTTP"| Tracking
+  JellyfinExt <-->|"HTTP"| Tracking
+  DiscordExt <-->|"RPC"| Integrations
+
+  Overlay & Mining --> Bridge
+  Bridge --> Visible
+  Bridge --> Invisible
+  Bridge --> Secondary
+  Visible & Invisible & Secondary --> UI
+
+  style Comp fill:#363a4f,stroke:#494d64,color:#cad3f5
+  style Svc fill:#363a4f,stroke:#494d64,color:#cad3f5
+  style Rend fill:#363a4f,stroke:#494d64,color:#cad3f5
+  style Ext fill:#363a4f,stroke:#494d64,color:#cad3f5
+  style ExtRt fill:#363a4f,stroke:#494d64,color:#cad3f5
+```
+
+## Composition Pattern
+
+Most runtime code follows a dependency-injection pattern:
+
+1. Define a service interface in `src/core/services/*`.
+2. Keep core logic in pure or side-effect-bounded functions.
+3. Build runtime deps in `src/main/` composition modules; extract an adapter/helper only when it adds meaningful behavior or reuse.
+4. Call the service from lifecycle/command wiring points.
+
+The composition root (`src/main.ts`) delegates to focused modules in `src/main/` and `src/main/runtime/composers/`:
+
+- `startup.ts` — argv/env processing and bootstrap flow
+- `app-lifecycle.ts` — Electron lifecycle event registration
+- `startup-lifecycle.ts` — app-ready initialization sequence
+- `state.ts` — centralized application runtime state container
+- `ipc-runtime.ts` — IPC channel registration and handler wiring
+- `cli-runtime.ts` — CLI command parsing and dispatch
+- `overlay-runtime.ts` — overlay window selection and modal state management
+- `subsync-runtime.ts` — subsync command orchestration
+- `runtime/composers/anilist-tracking-composer.ts` — AniList media tracking/probe/retry wiring
+- `runtime/composers/jellyfin-runtime-composer.ts` — Jellyfin config/client/playback/command/setup composition wiring
+- `runtime/composers/mpv-runtime-composer.ts` — MPV event/factory/tokenizer/warmup wiring
+
+Composer modules share contract conventions via `src/main/runtime/composers/contracts.ts`:
+
+- composer input surfaces are declared with `ComposerInputs<T>` so required dependencies cannot be omitted at compile time
+- composer outputs are declared with `ComposerOutputs<T>` to keep result contracts explicit and stable
+- builder return payload extraction should use shared type helpers instead of inline ad-hoc inference
+
+This keeps side effects explicit and makes behavior easy to unit-test with fakes.
+
+Additional conventions in the current code:
+
+- `main.ts` uses `createMainRuntimeRegistry()` (`src/main/runtime/registry.ts`) to access domain handlers (`startup`, `overlay`, `mpv`, `ipc`, `shortcuts`, `anilist`, `jellyfin`, `mining`) without importing every runtime module directly.
+- Domain barrels in `src/main/runtime/domains/*` re-export runtime handlers + main-deps builders, while composers in `src/main/runtime/composers/*` assemble larger runtime clusters.
+- Many runtime handlers accept `*MainDeps` objects generated by `createBuild*MainDepsHandler` builders to isolate side effects and keep units testable.
+
+### IPC Contract + Validation Boundary
+
+- Central channel constants live in `src/shared/ipc/contracts.ts` and are consumed by both main (`ipcMain`) and renderer preload (`ipcRenderer`) wiring.
+- Runtime payload parsers/type guards live in `src/shared/ipc/validators.ts`.
+- Rule: renderer-supplied payloads must be validated at IPC entry points (`src/core/services/ipc.ts`, `src/core/services/anki-jimaku-ipc.ts`) before calling domain handlers.
+- Malformed invoke payloads return explicit structured errors (for example `{ ok: false, error: ... }`) and malformed fire-and-forget payloads are ignored safely.
+
+### Runtime State Ownership (Migrated Domains)
+
+For domains migrated to reducer-style transitions (for example AniList token/queue/media-guess runtime state), follow these rules:
+
+- Composition/runtime modules own mutable state cells and expose narrow `get*`/`set*` accessors.
+- Domain handlers do not mutate foreign state directly; they call explicit transition helpers that encode invariants.
+- Transition helpers may sync derived counters/snapshots, but must preserve non-owned metadata unless the transition explicitly owns that metadata.
+- Reducer boundary: when a domain has transition helpers in `src/main/state.ts`, new callsites should route updates through those helpers instead of ad-hoc object mutation in `main.ts` or composers.
+- Tests for migrated domains should assert both the intended field changes and non-targeted field invariants.
+
+## Program Lifecycle
+
+- **Module-level init:** Before `app.ready`, the composition root registers protocols, sets platform flags, constructs all services, and wires dependency injection. `runAndApplyStartupState()` parses CLI args and detects the compositor backend.
+- **Startup:** If `--generate-config` is passed, it writes the template and exits. Otherwise `app-lifecycle.ts` acquires the single-instance lock and registers Electron lifecycle hooks.
+- **Critical-path init:** Once `app.whenReady()` fires, `composeAppReadyRuntime()` runs strict config reload, resolves keybindings, creates the `MpvIpcClient` (which immediately connects and subscribes to 26 properties), and initializes the `RuntimeOptionsManager`, `SubtitleTimingTracker`, and `ImmersionTrackerService`.
+- **Overlay runtime:** `initializeOverlayRuntime()` creates three overlay windows — **visible** (interactive Yomitan lookups), **invisible** (mpv-matched subtitle positioning), and **secondary** (secondary subtitle bar, top 20% via `splitOverlayGeometryForSecondaryBar`) — then registers global shortcuts and sets initial bounds from the window tracker.
+- **Background warmups:** Non-critical services are launched asynchronously: MeCab tokenizer check, Yomitan extension load, JLPT + frequency dictionary prewarm, optional Jellyfin remote session, Discord presence service, and AniList token refresh.
+- **Runtime:** Event-driven. mpv property changes, IPC messages, CLI commands, overlay shortcuts, and hot-reload notifications route through runtime handlers/composers. Subtitle text flows through `SubtitlePipeline` (normalize → tokenize → merge), and results broadcast to all overlay windows.
+- **Shutdown:** `onWillQuitCleanup` destroys tray + config watcher, unregisters shortcuts, stops WebSocket + texthooker servers, closes the mpv socket + flushes OSD log, stops the window tracker, closes the Yomitan parser window, flushes the immersion tracker (SQLite), stops Jellyfin/Discord services, and cleans Anki/AniList state.
+
+```mermaid
+flowchart LR
+  classDef start fill:#c6a0f6,stroke:#494d64,color:#24273a,stroke-width:2px,font-weight:bold
+  classDef phase fill:#b7bdf8,stroke:#494d64,color:#24273a,stroke-width:1.5px
+  classDef decision fill:#f5a97f,stroke:#494d64,color:#24273a,stroke-width:1.5px
+  classDef init fill:#8aadf4,stroke:#494d64,color:#24273a,stroke-width:1.5px
+  classDef runtime fill:#8bd5ca,stroke:#494d64,color:#24273a,stroke-width:1.5px
+  classDef shutdown fill:#ed8796,stroke:#494d64,color:#24273a,stroke-width:1.5px
+  classDef warmup fill:#eed49f,stroke:#494d64,color:#24273a,stroke-width:1.5px
+
+  CLI["CLI args &<br/>environment"]:::start
+  CLI --> Proto["Module-level init<br/>register protocols<br/>construct services<br/>wire deps"]:::phase
+  Proto --> Parse["startup.ts<br/>parse argv<br/>detect backend"]:::phase
+  Parse --> GenCheck{"--generate<br/>-config?"}:::decision
+  GenCheck -->|"yes"| GenExit["Write template<br/>& exit"]:::phase
+  GenCheck -->|"no"| Lock["app-lifecycle.ts<br/>single-instance lock<br/>lifecycle hooks"]:::phase
+
+  Lock -->|"app.whenReady()"| Ready["composeAppReady<br/>Runtime()"]:::phase
+
+  Ready --> Config["Config reload<br/>keybindings<br/>log level"]:::init
+  Ready --> MpvInit["MpvIpcClient<br/>connect socket<br/>subscribe 26 props"]:::init
+  Ready --> Platform["RuntimeOptions<br/>timing tracker<br/>immersion tracker"]:::init
+
+  Config --> OverlayInit
+  MpvInit --> OverlayInit
+  Platform --> OverlayInit
+
+  OverlayInit["initializeOverlay<br/>Runtime()"]:::phase
+
+  OverlayInit --> VisWin["Visible window<br/>Yomitan lookups"]:::init
+  OverlayInit --> InvWin["Invisible window<br/>mpv positioning"]:::init
+  OverlayInit --> SecWin["Secondary window<br/>subtitle bar"]:::init
+  OverlayInit --> Shortcuts["Register global<br/>shortcuts"]:::init
+
+  VisWin --> Warmups
+  InvWin --> Warmups
+  SecWin --> Warmups
+  Shortcuts --> Warmups
+
+  Warmups["Background<br/>warmups"]:::phase
+
+  Warmups --> W1["MeCab"]:::warmup
+  Warmups --> W2["Yomitan"]:::warmup
+  Warmups --> W3["JLPT + freq<br/>dictionaries"]:::warmup
+  Warmups --> W4["Jellyfin"]:::warmup
+  Warmups --> W5["Discord"]:::warmup
+  Warmups --> W6["AniList"]:::warmup
+
+  W1 & W2 & W3 & W4 & W5 & W6 --> Loop
+
+  subgraph Loop["Runtime — event-driven"]
+    direction TB
+    MpvEvt["mpv events: subtitle · timing · metrics"]:::runtime
+    IpcEvt["IPC: renderer requests · CLI commands"]:::runtime
+    ExtEvt["Shortcuts · config hot-reload"]:::runtime
+    MpvEvt & IpcEvt & ExtEvt --> Route["Route via composers"]:::runtime
+    Route --> Process["SubtitlePipeline<br/>normalize → tokenize → merge"]:::runtime
+    Process --> Broadcast["Update AppState<br/>broadcast to windows"]:::runtime
+  end
+
+  Loop -->|"quit signal"| Quit["will-quit"]:::shutdown
+
+  Quit --> T1["Tray · config watcher<br/>global shortcuts"]:::shutdown
+  Quit --> T2["WebSocket · texthooker<br/>mpv socket · OSD log"]:::shutdown
+  Quit --> T3["Window tracker<br/>Yomitan parser"]:::shutdown
+  Quit --> T4["Immersion tracker<br/>Jellyfin · Discord<br/>Anki · AniList"]:::shutdown
+
+  style Loop fill:#363a4f,stroke:#494d64,color:#cad3f5
+```
+
+## Why This Design
+
+- **Smaller blast radius:** changing one feature usually touches one service.
+- **Better testability:** most behavior can be tested without Electron windows/mpv.
+- **Better reviewability:** PRs can be scoped to one subsystem.
+- **Backward compatibility:** CLI flags and IPC channels can remain stable while internals evolve.
+- **Runtime registry + domain barrels:** `src/main/runtime/registry.ts` and `src/main/runtime/domains/*` reduce direct fan-in inside `main.ts` while keeping domain ownership explicit.
+- **Extracted composition root:** `main.ts` delegates to focused modules under `src/main/` and `src/main/runtime/composers/` for lifecycle, IPC, overlay, mpv, shortcut, and integration wiring.
+- **Split MPV service layers:** MPV internals are separated into transport (`mpv-transport.ts`), protocol (`mpv-protocol.ts`), and properties/render metrics modules for maintainability.
+- **Config by domain:** defaults, option registries, and resolution are split by domain under `src/config/definitions/*` and `src/config/resolve/*`, keeping config evolution localized.
+
+## Extension Rules
+
+- Add behavior to an existing service in `src/core/services/*` or create a focused runtime module under `src/main/runtime/*`; avoid ad-hoc logic in `main.ts`.
+- Add new cross-process channels in `src/shared/ipc/contracts.ts` first, validate payloads in `src/shared/ipc/validators.ts`, then wire handlers in IPC runtime modules.
+- If change spans startup/overlay/mpv/integration wiring, prefer composing through `src/main/runtime/domains/*` + `src/main/runtime/composers/*` rather than direct wiring in `main.ts`.
+- Keep service APIs explicit and narrowly scoped, and preserve existing CLI flag / IPC channel behavior unless the change is intentionally breaking.
+- Add or update focused tests (including malformed-payload IPC tests) when runtime boundaries or contracts change.
diff --git a/docs/configuration.md b/docs/configuration.md
new file mode 100644
index 0000000..5d031cb
--- /dev/null
+++ b/docs/configuration.md
@@ -0,0 +1,904 @@
+# Configuration
+
+Settings are stored in `$XDG_CONFIG_HOME/SubMiner/config.jsonc` (or `~/.config/SubMiner/config.jsonc` when `XDG_CONFIG_HOME` is unset).
+
+## Quick Start
+
+For most users, start with this minimal configuration:
+
+```json
+{
+  "ankiConnect": {
+    "enabled": true,
+    "deck": "YourDeckName",
+    "fields": {
+      "sentence": "Sentence",
+      "audio": "Audio",
+      "image": "Image"
+    }
+  }
+}
+```
+
+Then customize as needed using the sections below.
+
+## Configuration File
+
+See [config.example.jsonc](/config.example.jsonc) for a comprehensive example configuration file with all available options, default values, and detailed comments. Only include the options you want to customize in your config file.
+
+Generate a fresh default config from the centralized config registry:
+
+```bash
+SubMiner.AppImage --generate-config
+SubMiner.AppImage --generate-config --config-path /tmp/subminer.jsonc
+SubMiner.AppImage --generate-config --backup-overwrite
+```
+
+- `--generate-config` writes a default JSONC config template.
+- JSONC config supports comments and trailing commas.
+- If the target file exists, SubMiner prompts to create a timestamped backup and overwrite.
+- In non-interactive shells, use `--backup-overwrite` to explicitly back up and overwrite.
+
+Malformed config syntax (invalid JSON/JSONC) is startup-blocking: SubMiner shows a clear parse error with the config path and asks you to fix the file and restart.
+
+For valid JSON/JSONC with invalid option values, SubMiner uses warn-and-fallback behavior: it logs the bad key/value and continues with the default for that option.
+
+### Hot-Reload Behavior
+
+SubMiner watches the active config file (`config.jsonc` or `config.json`) while running and applies supported updates automatically.
+
+Hot-reloadable fields:
+
+- `subtitleStyle`
+- `keybindings`
+- `shortcuts`
+- `secondarySub.defaultMode`
+- `ankiConnect.ai`
+
+When these values change, SubMiner applies them live. Invalid config edits are rejected and the previous valid runtime config remains active.
+
+Restart-required changes:
+
+- Any other config sections still require restart.
+- SubMiner shows an on-screen/system notification listing restart-required sections when they change.
+
+### Configuration Options Overview
+
+The configuration file includes several main sections:
+
+- [**AnkiConnect**](#ankiconnect) - Automatic Anki card creation with media
+- [**Auto-Start Overlay**](#auto-start-overlay) - Automatically show overlay on MPV connection
+- [**Visible Overlay Subtitle Binding**](#visible-overlay-subtitle-binding) - Link visible overlay toggles to MPV subtitle visibility
+- [**Auto Subtitle Sync**](#auto-subtitle-sync) - Sync current subtitle with `alass`/`ffsubsync`
+- [**Invisible Overlay**](#invisible-overlay) - Startup visibility behavior for the invisible mining layer
+- [**Jimaku**](#jimaku) - Jimaku API configuration and defaults
+- [**AniList**](#anilist) - Optional post-watch progress updates
+- [**Jellyfin**](#jellyfin) - Optional Jellyfin auth, library listing, and playback launch
+- [**Discord Rich Presence**](#discord-rich-presence) - Optional Discord activity card updates
+- [**Keybindings**](#keybindings) - MPV command shortcuts
+- [**Runtime Option Palette**](#runtime-option-palette) - Live, session-only option toggles
+- [**Secondary Subtitles**](#secondary-subtitles) - Dual subtitle track support
+- [**Shortcuts Configuration**](#shortcuts-configuration) - Overlay keyboard shortcuts
+- [**Subtitle Position**](#subtitle-position) - Overlay vertical positioning
+- [**Subtitle Style**](#subtitle-style) - Appearance customization
+- [**Texthooker**](#texthooker) - Control browser opening behavior
+- [**WebSocket Server**](#websocket-server) - Built-in subtitle broadcasting server
+- [**Immersion Tracking**](#immersion-tracking) - Track subtitle sessions and mining activity in SQLite
+- [**YouTube Subtitle Generation**](#youtube-subtitle-generation) - Launcher defaults for yt-dlp + local whisper fallback
+
+### AnkiConnect
+
+Enable automatic Anki card creation and updates with media generation:
+
+```json
+{
+  "ankiConnect": {
+    "enabled": true,
+    "url": "http://127.0.0.1:8765",
+    "pollingRate": 3000,
+    "tags": ["SubMiner"],
+    "deck": "Learning::Japanese",
+    "fields": {
+      "audio": "ExpressionAudio",
+      "image": "Picture",
+      "sentence": "Sentence",
+      "miscInfo": "MiscInfo",
+      "translation": "SelectionText"
+    },
+    "ai": {
+      "enabled": false,
+      "alwaysUseAiTranslation": false,
+      "apiKey": "",
+      "model": "openai/gpt-4o-mini",
+      "baseUrl": "https://openrouter.ai/api",
+      "targetLanguage": "English",
+      "systemPrompt": "You are a translation engine. Return only the translated text with no explanations."
+    },
+    "media": {
+      "generateAudio": true,
+      "generateImage": true,
+      "imageType": "static",
+      "imageFormat": "jpg",
+      "imageQuality": 92,
+      "imageMaxWidth": 1280,
+      "imageMaxHeight": 720,
+      "animatedFps": 10,
+      "animatedMaxWidth": 640,
+      "animatedMaxHeight": 360,
+      "animatedCrf": 35,
+      "audioPadding": 0.5,
+      "fallbackDuration": 3,
+      "maxMediaDuration": 30
+    },
+    "behavior": {
+      "autoUpdateNewCards": true,
+      "overwriteAudio": true,
+      "overwriteImage": true
+    },
+    "metadata": {
+      "pattern": "[SubMiner] %f (%t)"
+    },
+    "isLapis": {
+      "enabled": true,
+      "sentenceCardModel": "Japanese sentences"
+    },
+    "isKiku": {
+      "enabled": false,
+      "fieldGrouping": "disabled",
+      "deleteDuplicateInAuto": true
+    }
+  }
+}
+```
+
+This example is intentionally compact. The option table below documents available `ankiConnect` settings and behavior.
+
+**Requirements:** [AnkiConnect](https://github.com/FooSoft/anki-connect) plugin must be installed and running in Anki. ffmpeg must be installed for media generation.
+
+| Option                                  | Values                                  | Description                                                                                                                                   |
+| --------------------------------------- | --------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------- |
+| `enabled`                               | `true`, `false`                         | Enable AnkiConnect integration (default: `false`)                                                                                             |
+| `url`                                   | string (URL)                            | AnkiConnect API URL (default: `http://127.0.0.1:8765`)                                                                                        |
+| `pollingRate`                           | number (ms)                             | How often to check for new cards (default: `3000`)                                                                                            |
+| `tags`                                  | array of strings                        | Tags automatically added to cards mined/updated by SubMiner (default: `['SubMiner']`; set `[]` to disable automatic tagging).                 |
+| `deck`                                  | string                                  | Anki deck to monitor for new cards                                                                                                            |
+| `ankiConnect.nPlusOne.decks`            | array of strings                        | Decks used for N+1 known-word cache lookups. When omitted/empty, falls back to `ankiConnect.deck`.                                            |
+| `fields.audio`                          | string                                  | Card field for audio files (default: `ExpressionAudio`)                                                                                       |
+| `fields.image`                          | string                                  | Card field for images (default: `Picture`)                                                                                                    |
+| `fields.sentence`                       | string                                  | Card field for sentences (default: `Sentence`)                                                                                                |
+| `fields.miscInfo`                       | string                                  | Card field for metadata (default: `"MiscInfo"`, set to `null` to disable)                                                                     |
+| `fields.translation`                    | string                                  | Card field for sentence-card translation/back text (default: `SelectionText`)                                                                 |
+| `ai.enabled`                            | `true`, `false`                         | Use AI translation for sentence cards. Also auto-attempted when secondary subtitle is missing.                                                |
+| `ai.alwaysUseAiTranslation`             | `true`, `false`                         | When `true`, always use AI translation even if secondary subtitles exist. When `false`, AI is used only when no secondary subtitle exists.    |
+| `ai.apiKey`                             | string                                  | API key for your OpenAI-compatible endpoint (required for translation).                                                                       |
+| `ai.model`                              | string                                  | Model id for your OpenAI-compatible endpoint (default: `openai/gpt-4o-mini`).                                                                 |
+| `ai.baseUrl`                            | string (URL)                            | OpenAI-compatible API base URL; accepts with or without `/v1`.                                                                                |
+| `ai.targetLanguage`                     | string                                  | Target language name used in translation prompt (default: `English`).                                                                         |
+| `ai.systemPrompt`                       | string                                  | System prompt used for translation (default returns translation text only).                                                                   |
+| `media.generateAudio`                   | `true`, `false`                         | Generate audio clips from video (default: `true`)                                                                                             |
+| `media.generateImage`                   | `true`, `false`                         | Generate image/animation screenshots (default: `true`)                                                                                        |
+| `media.imageType`                       | `"static"`, `"avif"`                    | Image type: static screenshot or animated AVIF (default: `"static"`)                                                                          |
+| `media.imageFormat`                     | `"jpg"`, `"png"`, `"webp"`              | Image format (default: `"jpg"`)                                                                                                               |
+| `media.imageQuality`                    | number (1-100)                          | Image quality for JPG/WebP; PNG ignores this (default: `92`)                                                                                  |
+| `media.imageMaxWidth`                   | number (px)                             | Optional max width for static screenshots. Unset keeps source width.                                                                          |
+| `media.imageMaxHeight`                  | number (px)                             | Optional max height for static screenshots. Unset keeps source height.                                                                        |
+| `media.animatedFps`                     | number (1-60)                           | FPS for animated AVIF (default: `10`)                                                                                                         |
+| `media.animatedMaxWidth`                | number (px)                             | Max width for animated AVIF (default: `640`)                                                                                                  |
+| `media.animatedMaxHeight`               | number (px)                             | Optional max height for animated AVIF. Unset keeps source aspect-constrained height.                                                          |
+| `media.animatedCrf`                     | number (0-63)                           | CRF quality for AVIF; lower = higher quality (default: `35`)                                                                                  |
+| `media.audioPadding`                    | number (seconds)                        | Padding around audio clip timing (default: `0.5`)                                                                                             |
+| `media.fallbackDuration`                | number (seconds)                        | Default duration if timing unavailable (default: `3.0`)                                                                                       |
+| `media.maxMediaDuration`                | number (seconds)                        | Max duration for generated media from multi-line copy (default: `30`, `0` to disable)                                                         |
+| `behavior.overwriteAudio`               | `true`, `false`                         | Replace existing audio on updates; when `false`, new audio is appended/prepended per `behavior.mediaInsertMode` (default: `true`)             |
+| `behavior.overwriteImage`               | `true`, `false`                         | Replace existing images on updates; when `false`, new images are appended/prepended per `behavior.mediaInsertMode` (default: `true`)          |
+| `behavior.mediaInsertMode`              | `"append"`, `"prepend"`                 | Where to insert new media when overwrite is off (default: `"append"`)                                                                         |
+| `behavior.highlightWord`                | `true`, `false`                         | Highlight the word in sentence context (default: `true`)                                                                                      |
+| `ankiConnect.nPlusOne.highlightEnabled` | `true`, `false`                         | Enable fast local highlighting for words already known in Anki (default: `false`)                                                             |
+| `ankiConnect.nPlusOne.nPlusOne`         | hex color string                        | Text color for the single target token to study when exactly one unknown candidate exists in a sentence (default: `"#c6a0f6"`).               |
+| `ankiConnect.nPlusOne.knownWord`        | hex color string                        | Legacy known-word color kept for backward compatibility (default: `"#a6da95"`).                                                               |
+| `ankiConnect.nPlusOne.matchMode`        | `"headword"`, `"surface"`               | Matching strategy for known-word highlighting (default: `"headword"`). `headword` uses token headwords; `surface` uses visible subtitle text. |
+| `ankiConnect.nPlusOne.minSentenceWords` | number                                  | Minimum number of words required in a sentence before single unknown-word N+1 highlighting can trigger (default: `3`).                        |
+| `ankiConnect.nPlusOne.refreshMinutes`   | number                                  | Minutes between known-word cache refreshes (default: `1440`)                                                                                  |
+| `ankiConnect.nPlusOne.decks`            | array of strings                        | Decks used by known-word cache refresh. Leave empty for compatibility with legacy `deck` scope.                                               |
+| `behavior.notificationType`             | `"osd"`, `"system"`, `"both"`, `"none"` | Notification type on card update (default: `"osd"`)                                                                                           |
+| `behavior.autoUpdateNewCards`           | `true`, `false`                         | Automatically update cards on creation (default: `true`)                                                                                      |
+| `metadata.pattern`                      | string                                  | Format pattern for metadata: `%f`=filename, `%F`=filename+ext, `%t`=time                                                                      |
+| `isLapis`                               | object                                  | Lapis/shared sentence-card config: `{ enabled, sentenceCardModel }`. Sentence/audio field names are fixed to `Sentence` and `SentenceAudio`.  |
+| `isKiku`                                | object                                  | Kiku-only config: `{ enabled, fieldGrouping, deleteDuplicateInAuto }` (shared sentence/audio/model settings are inherited from `isLapis`)     |
+
+**Kiku / Lapis Note Type Support:**
+
+SubMiner supports the [Lapis](https://github.com/donkuri/lapis) and [Kiku](https://kiku.youyoumu.my.id/) note types. Both `isLapis.enabled` and `isKiku.enabled` can be true; Kiku takes precedence for grouping behavior, while sentence-card model/field settings come from `isLapis`.
+
+When enabled, sentence cards automatically set `IsSentenceCard` to `"x"` and populate the `Expression` field. Audio cards set `IsAudioCard` to `"x"`.
+
+Kiku extends Lapis with **field grouping** — when a duplicate card is detected (same Word/Expression), SubMiner merges the two cards' content into one using Kiku's `data-group-id` HTML structure, organizing each mining instance into separate pages within the note.
+
+### N+1 Word Highlighting
+
+When `ankiConnect.nPlusOne.highlightEnabled` is enabled, SubMiner builds a local cache of known words from Anki to highlight already learned tokens in subtitle rendering.
+
+Known-word cache policy:
+
+- Initial sync runs when the integration starts if the cache is missing or stale.
+- `ankiConnect.nPlusOne.refreshMinutes` controls the minimum time between refreshes; between refreshes, cached words are reused without querying Anki.
+- `ankiConnect.nPlusOne.nPlusOne` sets the color for the single target token when exactly one eligible unknown word exists.
+- `ankiConnect.nPlusOne.minSentenceWords` sets the minimum token count required in a sentence for N+1 highlighting (default: `3`).
+- `ankiConnect.nPlusOne.knownWord` sets the legacy known-word highlight color for tokens already in Anki.
+- `ankiConnect.nPlusOne.decks` accepts one or more decks. If empty, it uses the legacy single `ankiConnect.deck` value as scope.
+- Cache state is persisted to `known-words-cache.json` under the app `userData` directory.
+- The cache is automatically invalidated when the configured scope changes (for example, when deck changes).
+- Cache lookups are in-memory. By default, token headwords are matched against cached `Expression` / `Word` values; set `ankiConnect.nPlusOne.matchMode` to `"surface"` for raw subtitle text matching.
+- `ankiConnect.behavior.nPlusOne*` legacy keys (`nPlusOneHighlightEnabled`, `nPlusOneRefreshMinutes`, `nPlusOneMatchMode`) are deprecated and only kept for backward compatibility.
+- Legacy top-level `ankiConnect` migration keys (for example `audioField`, `generateAudio`, `imageType`) are compatibility-only, validated before mapping, and ignored with a warning when invalid.
+- If AnkiConnect is unreachable, the cache remains in its previous state and an on-screen/system status message is shown.
+- Known-word sync activity is logged at `INFO`/`DEBUG` level with the `anki` logger scope and includes scope, notes returned, and word counts.
+
+To refresh roughly once per day, set:
+
+```json
+{
+  "ankiConnect": {
+    "nPlusOne": {
+      "highlightEnabled": true,
+      "refreshMinutes": 1440
+    }
+  }
+}
+```
+
+### Field Grouping Modes
+
+| Mode       | Behavior                                                                                                                   |
+| ---------- | -------------------------------------------------------------------------------------------------------------------------- |
+| `auto`     | Automatically merges the new card's content into the original; duplicate deletion is controlled by `deleteDuplicateInAuto` |
+| `manual`   | Shows an overlay popup to choose which card to keep and whether to delete the duplicate after merge                        |
+| `disabled` | No field grouping; duplicate cards are left as-is                                                                          |
+
+`deleteDuplicateInAuto` controls whether `auto` mode deletes the duplicate after merge (default: `true`). In `manual` mode, the popup asks each time whether to delete the duplicate.
+
+<video controls playsinline preload="metadata" poster="/assets/kiku-integration-poster.jpg" style="width: 100%; max-width: 960px;">
+  <source :src="'/assets/kiku-integration.webm'" type="video/webm" />
+  Your browser does not support the video tag.
+</video>
+
+<a :href="'/assets/kiku-integration.webm'" target="_blank" rel="noreferrer">Open demo in a new tab</a>
+
+**Image Quality Notes:**
+
+- `imageQuality` affects JPG and WebP only; PNG is lossless and ignores this setting
+- JPG quality is mapped to FFmpeg's scale (2-31, lower = better)
+- WebP quality uses FFmpeg's native 0-100 scale
+
+### Manual Card Update Shortcuts
+
+When `behavior.autoUpdateNewCards` is set to `false`, new cards are detected but not automatically updated. Use these keyboard shortcuts for manual control:
+
+| Shortcut       | Action                                                                                                             |
+| -------------- | ------------------------------------------------------------------------------------------------------------------ |
+| `Ctrl+C`       | Copy the current subtitle line to clipboard (preserves line breaks)                                                |
+| `Ctrl+Shift+C` | Enter multi-copy mode. Press `1-9` to copy that many recent lines, or `Esc` to cancel. Timeout: 3 seconds          |
+| `Ctrl+V`       | Update the last added Anki card using subtitles from clipboard                                                     |
+| `Ctrl+G`       | Trigger Kiku duplicate field grouping for the last added card (only when `behavior.autoUpdateNewCards` is `false`) |
+| `Ctrl+S`       | Create a sentence card from the current subtitle line                                                              |
+| `Ctrl+Shift+S` | Enter multi-mine mode. Press `1-9` to create a sentence card from that many recent lines, or `Esc` to cancel       |
+| `Ctrl+Shift+V` | Cycle secondary subtitle display mode (hidden → visible → hover)                                                   |
+| `Ctrl+Shift+A` | Mark the last added Anki card as an audio card (sets IsAudioCard, SentenceAudio, Sentence, Picture)                |
+| `Ctrl+Shift+O` | Open runtime options palette (session-only live toggles)                                                           |
+| `Ctrl/Cmd+A`   | Append clipboard video path to MPV playlist (fixed, not currently configurable)                                    |
+
+**Multi-line copy workflow:**
+
+1. Press `Ctrl+Shift+C`
+2. Press a number key (`1-9`) within 3 seconds
+3. The specified number of most recent subtitle lines are copied
+4. Press `Ctrl+V` to update the last added card with the copied lines
+
+These shortcuts are only active when the overlay window is visible and automatically disabled when hidden.
+
+### Session help modal
+
+The session help modal is opened with `Y-H` by default (falls back to `Y-K` if needed) and shows the current session keybindings and color legend.
+
+You can filter the modal quickly with `/`:
+
+- Type any part of the action name or shortcut in the search bar.
+- Search is case-insensitive and ignores spaces/punctuation (`+`, `-`, `_`, `/`) so `ctrl w`, `ctrl+w`, and `ctrl+s` all match.
+- Results are filtered across active MPV shortcuts, configured overlay shortcuts, and color legend items.
+
+While the modal is open:
+
+- `Esc`: close the modal (or clear the filter when text is entered)
+- `↑/↓`, `j/k`: move selection
+- Mouse/trackpad: click to select and activate rows
+
+The list is generated at runtime from:
+
+- Your active mpv keybindings (`keybindings`).
+- Your configured overlay shortcuts (`shortcuts`, including runtime-loaded config values).
+- Current subtitle color settings from `subtitleStyle`.
+
+When config hot-reload updates shortcut/keybinding/style values, close and reopen the help modal to refresh the displayed entries.
+
+### Auto-Start Overlay
+
+Control whether the overlay automatically becomes visible when it connects to mpv:
+
+```json
+{
+  "auto_start_overlay": false
+}
+```
+
+| Option               | Values          | Description                                            |
+| -------------------- | --------------- | ------------------------------------------------------ |
+| `auto_start_overlay` | `true`, `false` | Auto-show overlay on mpv connection (default: `false`) |
+
+The mpv plugin controls startup per layer via `auto_start_visible_overlay` and `auto_start_invisible_overlay` in `subminer.conf` (`platform-default` for invisible means hidden on Linux, visible on macOS/Windows).
+
+### Visible Overlay Subtitle Binding
+
+Control whether toggling the visible overlay also toggles MPV subtitle visibility:
+
+```json
+{
+  "bind_visible_overlay_to_mpv_sub_visibility": true
+}
+```
+
+| Option                                       | Values          | Description                                                                                                                                                                              |
+| -------------------------------------------- | --------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
+| `bind_visible_overlay_to_mpv_sub_visibility` | `true`, `false` | When `true` (default), visible overlay hides MPV primary/secondary subtitles and restores them when hidden. When `false`, visible overlay toggles do not change MPV subtitle visibility. |
+
+### Auto Subtitle Sync
+
+Sync the active subtitle track using `alass` (preferred) or `ffsubsync`:
+
+```json
+{
+  "subsync": {
+    "defaultMode": "auto",
+    "alass_path": "",
+    "ffsubsync_path": "",
+    "ffmpeg_path": ""
+  }
+}
+```
+
+| Option           | Values               | Description                                                                                                 |
+| ---------------- | -------------------- | ----------------------------------------------------------------------------------------------------------- |
+| `defaultMode`    | `"auto"`, `"manual"` | `auto`: try `alass` against secondary subtitle, then fallback to `ffsubsync`; `manual`: open overlay picker |
+| `alass_path`     | string path          | Path to `alass` executable. Empty or `null` falls back to `/usr/bin/alass`.                                 |
+| `ffsubsync_path` | string path          | Path to `ffsubsync` executable. Empty or `null` falls back to `/usr/bin/ffsubsync`.                         |
+| `ffmpeg_path`    | string path          | Path to `ffmpeg` (used for internal subtitle extraction). Empty or `null` falls back to `/usr/bin/ffmpeg`.  |
+
+Default trigger is `Ctrl+Alt+S` via `shortcuts.triggerSubsync`.
+Customize it there, or set it to `null` to disable.
+
+### Invisible Overlay
+
+SubMiner includes a second subtitle mining layer that can be visually invisible while still interactive for Yomitan lookups.
+
+- `invisibleOverlay.startupVisibility` values:
+
+1. `"platform-default"`: hidden on Wayland, visible on Windows/macOS/other sessions.
+2. `"visible"`: always shown on startup.
+3. `"hidden"`: always hidden on startup.
+
+Invisible subtitle positioning can be adjusted directly in the invisible layer:
+
+- `Ctrl/Cmd+Shift+P` toggles position edit mode.
+- Use arrow keys to move the invisible subtitle text.
+- Press `Enter` or `Ctrl/Cmd+S` to save, or `Esc` to cancel.
+- This edit-mode shortcut is fixed (not currently configurable in `shortcuts`/`keybindings`).
+
+### Jimaku
+
+Configure Jimaku API access and defaults:
+
+```json
+{
+  "jimaku": {
+    "apiKey": "YOUR_API_KEY",
+    "apiKeyCommand": "cat ~/.jimaku_key",
+    "apiBaseUrl": "https://jimaku.cc",
+    "languagePreference": "ja",
+    "maxEntryResults": 10
+  }
+}
+```
+
+Jimaku is rate limited; if you hit a limit, SubMiner will surface the retry delay from the API response.
+
+Set `openBrowser` to `false` to only print the URL without opening a browser.
+
+### AniList
+
+AniList integration is opt-in and disabled by default. Enable it to allow SubMiner to update watched episode progress after playback.
+
+```json
+{
+  "anilist": {
+    "enabled": true,
+    "accessToken": ""
+  }
+}
+```
+
+| Option        | Values          | Description                                                             |
+| ------------- | --------------- | ----------------------------------------------------------------------- |
+| `enabled`     | `true`, `false` | Enable AniList post-watch progress updates (default: `false`)           |
+| `accessToken` | string          | Optional explicit AniList access token override (default: empty string) |
+
+When `enabled` is `true` and `accessToken` is empty, SubMiner opens an AniList setup helper window. Keep `enabled` as `false` to disable all AniList setup/update behavior.
+
+Current post-watch behavior:
+
+- SubMiner attempts an update near episode completion (`>=85%` watched and at least `10` minutes watched).
+- Episode/title detection is `guessit`-first with fallback to SubMiner's filename parser.
+- If `guessit` is unavailable, updates still work via fallback parsing but title matching can be less accurate.
+- If embedded AniList auth UI fails to render, SubMiner opens the authorize URL in your default browser and shows fallback instructions in-app.
+- Failed updates are retried with a persistent backoff queue in the background.
+
+Setup flow details:
+
+1. Set `anilist.enabled` to `true`.
+2. Leave `anilist.accessToken` empty and restart SubMiner (or run `--anilist-setup`) to trigger setup.
+3. Approve access in AniList.
+4. Callback flow returns to SubMiner via `subminer://anilist-setup?...`, and SubMiner stores the token automatically.
+
+Token + detection notes:
+
+- `anilist.accessToken` can be set directly in config; when blank, SubMiner uses the locally stored encrypted token from setup.
+- Detection quality is best when `guessit` is installed and available on `PATH`.
+- When `guessit` cannot parse or is missing, SubMiner falls back automatically to internal filename parsing.
+
+AniList CLI commands:
+
+- `--anilist-status`: print current AniList token resolution state and retry queue counters.
+- `--anilist-logout`: clear stored AniList token from local persisted state.
+- `--anilist-setup`: open AniList setup/auth flow helper window.
+- `--anilist-retry-queue`: process one ready retry queue item immediately.
+
+### Jellyfin
+
+Jellyfin integration is optional and disabled by default. When enabled, SubMiner can authenticate, list libraries/items, and resolve direct/transcoded playback URLs for mpv launch.
+
+```json
+{
+  "jellyfin": {
+    "enabled": true,
+    "serverUrl": "http://127.0.0.1:8096",
+    "username": "",
+    "remoteControlEnabled": true,
+    "remoteControlAutoConnect": true,
+    "autoAnnounce": false,
+    "remoteControlDeviceName": "SubMiner",
+    "defaultLibraryId": "",
+    "directPlayPreferred": true,
+    "directPlayContainers": ["mkv", "mp4", "webm", "mov", "flac", "mp3", "aac"],
+    "transcodeVideoCodec": "h264"
+  }
+}
+```
+
+| Option                     | Values          | Description                                                                                                  |
+| -------------------------- | --------------- | ------------------------------------------------------------------------------------------------------------ |
+| `enabled`                  | `true`, `false` | Enable Jellyfin integration and CLI commands (default: `false`)                                              |
+| `serverUrl`                | string (URL)    | Jellyfin server base URL                                                                                     |
+| `username`                 | string          | Default username used by `--jellyfin-login`                                                                  |
+| `deviceId`                 | string          | Client device id sent in auth headers (default: `subminer`)                                                  |
+| `clientName`               | string          | Client name sent in auth headers (default: `SubMiner`)                                                       |
+| `clientVersion`            | string          | Client version sent in auth headers (default: `0.1.0`)                                                       |
+| `defaultLibraryId`         | string          | Default library id for `--jellyfin-items` when CLI value is omitted                                          |
+| `remoteControlEnabled`     | `true`, `false` | Enable Jellyfin cast/remote-control session support                                                          |
+| `remoteControlAutoConnect` | `true`, `false` | Auto-connect Jellyfin remote session on app startup (requires `jellyfin.enabled` and `remoteControlEnabled`) |
+| `autoAnnounce`             | `true`, `false` | Auto-run cast-target visibility announce check on connect (default: `false`)                                 |
+| `remoteControlDeviceName`  | string          | Device name shown in Jellyfin cast/device lists                                                              |
+| `pullPictures`             | `true`, `false` | Enable poster/icon fetching for launcher Jellyfin pickers                                                    |
+| `iconCacheDir`             | string          | Cache directory for launcher-fetched Jellyfin poster icons                                                   |
+| `directPlayPreferred`      | `true`, `false` | Prefer direct stream URLs before transcoding                                                                 |
+| `directPlayContainers`     | string[]        | Container allowlist for direct play decisions                                                                |
+| `transcodeVideoCodec`      | string          | Preferred transcode video codec fallback (default: `h264`)                                                   |
+
+Jellyfin auth session (`accessToken` + `userId`) is stored in local encrypted storage after login/setup.
+
+Launcher subcommands:
+
+- `subminer jellyfin` (or `subminer jf`) opens setup.
+- `subminer jellyfin -l --server ... --username ... --password ...` logs in.
+- `subminer jellyfin --logout` clears stored credentials.
+- `subminer jellyfin -p` opens play picker.
+- `subminer jellyfin -d` starts cast discovery mode.
+
+See [Jellyfin Integration](/jellyfin-integration) for the full setup and cast-to-device guide.
+
+Jellyfin remote auto-connect runs only when all three are `true`: `jellyfin.enabled`, `jellyfin.remoteControlEnabled`, and `jellyfin.remoteControlAutoConnect`.
+
+### Discord Rich Presence
+
+Discord Rich Presence is optional and disabled by default. When enabled, SubMiner publishes a polished activity card that reflects current media title, playback state, and session timer.
+
+```json
+{
+  "discordPresence": {
+    "enabled": true,
+    "updateIntervalMs": 3000,
+    "debounceMs": 750
+  }
+}
+```
+
+| Option             | Values          | Description                                                |
+| ------------------ | --------------- | ---------------------------------------------------------- |
+| `enabled`          | `true`, `false` | Enable Discord Rich Presence updates (default: `false`)    |
+| `updateIntervalMs` | number          | Minimum interval between activity updates in milliseconds  |
+| `debounceMs`       | number          | Debounce window for bursty playback events in milliseconds |
+
+Setup steps:
+
+1. Set `discordPresence.enabled` to `true`.
+2. Restart SubMiner.
+
+SubMiner uses a fixed official activity card style for all users:
+
+- Details: current media title while playing (fallback: `Mining and crafting (Anki cards)` when idle/disconnected)
+- State: `Playing mm:ss / mm:ss` or `Paused mm:ss / mm:ss` (fallback: `Idle`)
+- Large image key/text: `subminer-logo` / `SubMiner`
+- Small image key/text: `study` / `Sentence Mining`
+- No activity button by default
+
+Troubleshooting:
+
+- If the card does not appear, verify Discord desktop app is running.
+- If images do not render, confirm asset keys exactly match uploaded Discord asset names.
+- If Discord is closed/not installed/disconnects, SubMiner continues running and quietly skips presence updates.
+
+### Keybindings
+
+Add a `keybindings` array to configure keyboard shortcuts that send commands to mpv:
+
+See `config.example.jsonc` for detailed configuration options and more examples.
+
+**Default keybindings:**
+
+| Key               | Command                    | Description                           |
+| ----------------- | -------------------------- | ------------------------------------- |
+| `Space`           | `["cycle", "pause"]`       | Toggle pause                          |
+| `ArrowRight`      | `["seek", 5]`              | Seek forward 5 seconds                |
+| `ArrowLeft`       | `["seek", -5]`             | Seek backward 5 seconds               |
+| `ArrowUp`         | `["seek", 60]`             | Seek forward 60 seconds               |
+| `ArrowDown`       | `["seek", -60]`            | Seek backward 60 seconds              |
+| `Shift+KeyH`      | `["sub-seek", -1]`         | Jump to previous subtitle             |
+| `Shift+KeyL`      | `["sub-seek", 1]`          | Jump to next subtitle                 |
+| `Ctrl+Shift+KeyH` | `["__replay-subtitle"]`    | Replay current subtitle, pause at end |
+| `Ctrl+Shift+KeyL` | `["__play-next-subtitle"]` | Play next subtitle, pause at end      |
+| `KeyQ`            | `["quit"]`                 | Quit mpv                              |
+| `Ctrl+KeyW`       | `["quit"]`                 | Quit mpv                              |
+
+**Custom keybindings example:**
+
+```json
+{
+  "keybindings": [
+    { "key": "ArrowRight", "command": ["seek", 5] },
+    { "key": "ArrowLeft", "command": ["seek", -5] },
+    { "key": "Shift+ArrowRight", "command": ["seek", 30] },
+    { "key": "KeyR", "command": ["script-binding", "immersive/auto-replay"] },
+    { "key": "KeyA", "command": ["script-message", "ankiconnect-add-note"] }
+  ]
+}
+```
+
+**Key format:** Use `KeyboardEvent.code` values (`Space`, `ArrowRight`, `KeyR`, etc.) with optional modifiers (`Ctrl+`, `Alt+`, `Shift+`, `Meta+`).
+
+**Disable a default binding:** Set command to `null`:
+
+```json
+{ "key": "Space", "command": null }
+```
+
+**Special commands:** Commands prefixed with `__` are handled internally by the overlay rather than sent to mpv. `__replay-subtitle` replays the current subtitle and pauses at its end. `__play-next-subtitle` seeks to the next subtitle, plays it, and pauses at its end. `__runtime-options-open` opens the runtime options palette. `__runtime-option-cycle:<id>[:next|prev]` cycles a runtime option value.
+
+**Supported commands:** Any valid mpv JSON IPC command array (`["cycle", "pause"]`, `["seek", 5]`, `["script-binding", "..."]`, etc.)
+
+**See `config.example.jsonc`** for more keybinding examples and configuration options.
+
+### Runtime Option Palette
+
+Use the runtime options palette to toggle settings live while SubMiner is running. These changes are session-only and reset on restart.
+
+Current runtime options:
+
+- `ankiConnect.behavior.autoUpdateNewCards` (`On` / `Off`)
+- `ankiConnect.isKiku.fieldGrouping` (`auto` / `manual` / `disabled`)
+
+Default shortcut: `Ctrl+Shift+O`
+
+Palette controls:
+
+- `Arrow Up/Down`: select option
+- `Arrow Left/Right`: change selected value
+- `Enter`: apply selected value
+- `Esc`: close
+
+### Secondary Subtitles
+
+Display a second subtitle track (e.g., English alongside Japanese) in the overlay:
+
+See `config.example.jsonc` for detailed configuration options.
+
+```json
+{
+  "secondarySub": {
+    "secondarySubLanguages": ["eng", "en"],
+    "autoLoadSecondarySub": true,
+    "defaultMode": "hover"
+  }
+}
+```
+
+| Option                  | Values                             | Description                                            |
+| ----------------------- | ---------------------------------- | ------------------------------------------------------ |
+| `secondarySubLanguages` | string[]                           | Language codes to auto-load (e.g., `["eng", "en"]`)    |
+| `autoLoadSecondarySub`  | `true`, `false`                    | Auto-detect and load matching secondary subtitle track |
+| `defaultMode`           | `"hidden"`, `"visible"`, `"hover"` | Initial display mode (default: `"hover"`)              |
+
+**Display modes:**
+
+- **hidden** — Secondary subtitles not shown
+- **visible** — Always visible at top of overlay
+- **hover** — Only visible when hovering over the subtitle area (default)
+
+**See `config.example.jsonc`** for additional secondary subtitle configuration options.
+
+### Shortcuts Configuration
+
+Customize or disable the overlay keyboard shortcuts:
+
+See `config.example.jsonc` for detailed configuration options.
+
+```json
+{
+  "shortcuts": {
+    "toggleVisibleOverlayGlobal": "Alt+Shift+O",
+    "toggleInvisibleOverlayGlobal": "Alt+Shift+I",
+    "copySubtitle": "CommandOrControl+C",
+    "copySubtitleMultiple": "CommandOrControl+Shift+C",
+    "updateLastCardFromClipboard": "CommandOrControl+V",
+    "triggerFieldGrouping": "CommandOrControl+G",
+    "triggerSubsync": "Ctrl+Alt+S",
+    "mineSentence": "CommandOrControl+S",
+    "mineSentenceMultiple": "CommandOrControl+Shift+S",
+    "markAudioCard": "CommandOrControl+Shift+A",
+    "openRuntimeOptions": "CommandOrControl+Shift+O",
+    "openJimaku": "Ctrl+Shift+J",
+    "multiCopyTimeoutMs": 3000
+  }
+}
+```
+
+| Option                         | Values           | Description                                                                                                                                   |
+| ------------------------------ | ---------------- | --------------------------------------------------------------------------------------------------------------------------------------------- |
+| `toggleVisibleOverlayGlobal`   | string \| `null` | Global accelerator for toggling visible subtitle overlay (default: `"Alt+Shift+O"`)                                                           |
+| `toggleInvisibleOverlayGlobal` | string \| `null` | Global accelerator for toggling invisible interactive overlay (default: `"Alt+Shift+I"`)                                                      |
+| `copySubtitle`                 | string \| `null` | Accelerator for copying current subtitle (default: `"CommandOrControl+C"`)                                                                    |
+| `copySubtitleMultiple`         | string \| `null` | Accelerator for multi-copy mode (default: `"CommandOrControl+Shift+C"`)                                                                       |
+| `updateLastCardFromClipboard`  | string \| `null` | Accelerator for updating card from clipboard (default: `"CommandOrControl+V"`)                                                                |
+| `triggerFieldGrouping`         | string \| `null` | Accelerator for Kiku field grouping on last card (default: `"CommandOrControl+G"`; only active when `behavior.autoUpdateNewCards` is `false`) |
+| `triggerSubsync`               | string \| `null` | Accelerator for running Subsync (default: `"Ctrl+Alt+S"`)                                                                                     |
+| `mineSentence`                 | string \| `null` | Accelerator for creating sentence card from current subtitle (default: `"CommandOrControl+S"`)                                                |
+| `mineSentenceMultiple`         | string \| `null` | Accelerator for multi-mine sentence card mode (default: `"CommandOrControl+Shift+S"`)                                                         |
+| `multiCopyTimeoutMs`           | number           | Timeout in ms for multi-copy/mine digit input (default: `3000`)                                                                               |
+| `toggleSecondarySub`           | string \| `null` | Accelerator for cycling secondary subtitle mode (default: `"CommandOrControl+Shift+V"`)                                                       |
+| `markAudioCard`                | string \| `null` | Accelerator for marking last card as audio card (default: `"CommandOrControl+Shift+A"`)                                                       |
+| `openRuntimeOptions`           | string \| `null` | Opens runtime options palette for live session-only toggles (default: `"CommandOrControl+Shift+O"`)                                           |
+| `openJimaku`                   | string \| `null` | Opens the Jimaku search modal (default: `"Ctrl+Shift+J"`)                                                                                     |
+
+**See `config.example.jsonc`** for the complete list of shortcut configuration options.
+
+Set any shortcut to `null` to disable it.
+
+Feature-dependent shortcuts/keybindings only run when their related integration is enabled. For example, Anki/Kiku shortcuts require `ankiConnect.enabled` (and Kiku-specific behavior where applicable), and Jellyfin remote startup behavior requires Jellyfin to be enabled.
+
+### Subtitle Position
+
+Set the initial vertical subtitle position (measured from the bottom of the screen):
+
+```json
+{
+  "subtitlePosition": {
+    "yPercent": 10
+  }
+}
+```
+
+| Option     | Values           | Description                                                            |
+| ---------- | ---------------- | ---------------------------------------------------------------------- |
+| `yPercent` | number (0 - 100) | Distance from the bottom as a percent of screen height (default: `10`) |
+
+### Subtitle Style
+
+Customize the appearance of primary and secondary subtitles:
+
+See `config.example.jsonc` for detailed configuration options.
+
+```json
+{
+  "subtitleStyle": {
+    "fontFamily": "Noto Sans CJK JP Regular, Noto Sans CJK JP, Arial Unicode MS, Arial, sans-serif",
+    "fontSize": 35,
+    "fontColor": "#cad3f5",
+    "fontWeight": "normal",
+    "fontStyle": "normal",
+    "backgroundColor": "rgb(30, 32, 48, 0.88)",
+    "secondary": {
+      "fontSize": 24,
+      "fontColor": "#ffffff",
+      "backgroundColor": "transparent"
+    }
+  }
+}
+```
+
+| Option                             | Values      | Description                                                                                                         |
+| ---------------------------------- | ----------- | ------------------------------------------------------------------------------------------------------------------- |
+| `fontFamily`                       | string      | CSS font-family value (default: `"Noto Sans CJK JP Regular, ..."`)                                                  |
+| `fontSize`                         | number (px) | Font size in pixels (default: `35`)                                                                                 |
+| `fontColor`                        | string      | Any CSS color value (default: `"#cad3f5"`)                                                                          |
+| `fontWeight`                       | string      | CSS font-weight, e.g. `"bold"`, `"normal"`, `"600"` (default: `"normal"`)                                           |
+| `fontStyle`                        | string      | `"normal"` or `"italic"` (default: `"normal"`)                                                                      |
+| `backgroundColor`                  | string      | Any CSS color, including `"transparent"` (default: `"rgb(30, 32, 48, 0.88)"`)                                       |
+| `enableJlpt`                       | boolean     | Enable JLPT level underline styling (`false` by default)                                                            |
+| `preserveLineBreaks`               | boolean     | Preserve line breaks in visible overlay subtitle rendering (`false` by default). Enable to mirror mpv line layout.  |
+| `frequencyDictionary.enabled`      | boolean     | Enable frequency highlighting from dictionary lookups (`false` by default)                                          |
+| `frequencyDictionary.sourcePath`   | string      | Path to a local frequency dictionary root. Leave empty or omit to use the built-in bundled dictionary search paths. |
+| `frequencyDictionary.topX`         | number      | Only color tokens whose frequency rank is `<= topX` (`1000` by default)                                             |
+| `frequencyDictionary.mode`         | string      | `"single"` or `"banded"` (`"single"` by default)                                                                    |
+| `frequencyDictionary.singleColor`  | string      | Color used for all highlighted tokens in single mode                                                                |
+| `frequencyDictionary.bandedColors` | string[]    | Array of five hex colors used for ranked bands in banded mode                                                       |
+| `nPlusOneColor`                    | string      | Existing n+1 highlight color (default: `#c6a0f6`)                                                                   |
+| `knownWordColor`                   | string      | Existing known-word highlight color (default: `#a6da95`)                                                            |
+| `jlptColors`                       | object      | JLPT level underline colors object (`N1`..`N5`)                                                                     |
+| `secondary`                        | object      | Override any of the above for secondary subtitles (optional)                                                        |
+
+JLPT underlining is powered by offline term-meta bank files at runtime. See [`docs/jlpt-vocab-bundle.md`](jlpt-vocab-bundle.md) for required files, source/version refresh steps, and deterministic fallback behavior.
+
+Frequency dictionary highlighting uses the same dictionary file format as JLPT bundle lookups (`term_meta_bank_*.json` under discovered dictionary directories). A token is highlighted when it has a positive integer `frequencyRank` (lower is more common) and the rank is within `topX`.
+
+Lookup behavior:
+
+- Set `frequencyDictionary.sourcePath` to a directory containing `term_meta_bank_*.json` for a fully custom source.
+- If `sourcePath` is missing or empty, SubMiner uses bundled defaults from `vendor/jiten_freq_global` (packaged under `<resources>/jiten_freq_global` in distribution builds).
+- In both cases, only terms with a valid `frequencyRank` are used; everything else falls back to no highlighting.
+
+In `single` mode all highlights use `singleColor`; in `banded` mode tokens map to five ascending color bands from most common to least common inside the topX window.
+
+Secondary subtitle defaults: `fontSize: 24`, `fontColor: "#ffffff"`, `backgroundColor: "transparent"`. Any property not set in `secondary` falls back to the CSS defaults.
+
+**See `config.example.jsonc`** for the complete list of subtitle style configuration options.
+
+`jlptColors` keys are:
+
+| Key  | Default   | Description             |
+| ---- | --------- | ----------------------- |
+| `N1` | `#ed8796` | JLPT N1 underline color |
+| `N2` | `#f5a97f` | JLPT N2 underline color |
+| `N3` | `#f9e2af` | JLPT N3 underline color |
+| `N4` | `#a6e3a1` | JLPT N4 underline color |
+| `N5` | `#8aadf4` | JLPT N5 underline color |
+
+### Texthooker
+
+Control whether the browser opens automatically when texthooker starts:
+
+See `config.example.jsonc` for detailed configuration options.
+
+```json
+{
+  "texthooker": {
+    "openBrowser": true
+  }
+}
+```
+
+### WebSocket Server
+
+The overlay includes a built-in WebSocket server that broadcasts subtitle text to connected clients (such as texthooker-ui) for external processing.
+
+By default, the server uses "auto" mode: it starts automatically unless [mpv_websocket](https://github.com/kuroahna/mpv_websocket) is detected at `~/.config/mpv/mpv_websocket`. If you have mpv_websocket installed, the built-in server is skipped to avoid conflicts.
+
+See `config.example.jsonc` for detailed configuration options.
+
+```json
+{
+  "websocket": {
+    "enabled": "auto",
+    "port": 6677
+  }
+}
+```
+
+| Option    | Values                    | Description                                              |
+| --------- | ------------------------- | -------------------------------------------------------- |
+| `enabled` | `true`, `false`, `"auto"` | `"auto"` (default) disables if mpv_websocket is detected |
+| `port`    | number                    | WebSocket server port (default: 6677)                    |
+
+### Immersion Tracking
+
+Enable or disable local immersion analytics stored in SQLite for mined subtitles and media sessions:
+
+```json
+{
+  "immersionTracking": {
+    "enabled": true,
+    "dbPath": "",
+    "batchSize": 25,
+    "flushIntervalMs": 500,
+    "queueCap": 1000,
+    "payloadCapBytes": 256,
+    "maintenanceIntervalMs": 86400000,
+    "retention": {
+      "eventsDays": 7,
+      "telemetryDays": 30,
+      "dailyRollupsDays": 365,
+      "monthlyRollupsDays": 1825,
+      "vacuumIntervalDays": 7
+    }
+  }
+}
+```
+
+| Option                         | Values                        | Description                                                                                                 |
+| ------------------------------ | ----------------------------- | ----------------------------------------------------------------------------------------------------------- |
+| `enabled`                      | `true`, `false`               | Enable immersion tracking. Defaults to `true`.                                                              |
+| `dbPath`                       | string                        | Optional SQLite database path. Leave empty to use default app-data path at `<config dir>/immersion.sqlite`. |
+| `batchSize`                    | integer (`1`-`10000`)         | Buffered writes per transaction. Default `25`.                                                              |
+| `flushIntervalMs`              | integer (`50`-`60000`)        | Maximum queue delay before flush. Default `500ms`.                                                          |
+| `queueCap`                     | integer (`100`-`100000`)      | In-memory queue cap. Overflow drops oldest writes. Default `1000`.                                          |
+| `payloadCapBytes`              | integer (`64`-`8192`)         | Event payload byte cap before truncation marker. Default `256`.                                             |
+| `maintenanceIntervalMs`        | integer (`60000`-`604800000`) | Prune + rollup maintenance cadence. Default `86400000` (24h).                                               |
+| `retention.eventsDays`         | integer (`1`-`3650`)          | Raw event retention window. Default `7` days.                                                               |
+| `retention.telemetryDays`      | integer (`1`-`3650`)          | Telemetry retention window. Default `30` days.                                                              |
+| `retention.dailyRollupsDays`   | integer (`1`-`36500`)         | Daily rollup retention window. Default `365` days.                                                          |
+| `retention.monthlyRollupsDays` | integer (`1`-`36500`)         | Monthly rollup retention window. Default `1825` days (~5 years).                                            |
+| `retention.vacuumIntervalDays` | integer (`1`-`3650`)          | Minimum spacing between `VACUUM` passes. Default `7` days.                                                  |
+
+When `dbPath` is blank or omitted, SubMiner writes telemetry and session summaries to the default app-data location:
+
+```text
+<config directory>/immersion.sqlite
+```
+
+Set `dbPath` only if you want to relocate the database (for backup, syncing, or inspection workflows). The database is created when tracking starts for the first time.
+
+See [Immersion Tracking Storage](/immersion-tracking) for schema details, query templates, retention/rollup behavior, and backend portability notes.
+
+### YouTube Subtitle Generation
+
+Set defaults used by the `subminer` launcher for YouTube subtitle extraction/transcription:
+
+```json
+{
+  "youtubeSubgen": {
+    "mode": "automatic",
+    "whisperBin": "/path/to/whisper-cli",
+    "whisperModel": "/path/to/ggml-model.bin",
+    "primarySubLanguages": ["ja", "jpn"]
+  }
+}
+```
+
+| Option                | Values                                 | Description                                                                                                                                           |
+| --------------------- | -------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------- |
+| `mode`                | `"automatic"`, `"preprocess"`, `"off"` | `automatic`: play immediately and load generated subtitles in background; `preprocess`: generate before playback; `off`: disable launcher generation. |
+| `whisperBin`          | string path                            | Path to `whisper.cpp` CLI binary used as fallback transcription engine.                                                                               |
+| `whisperModel`        | string path                            | Path to whisper model used by fallback transcription.                                                                                                 |
+| `primarySubLanguages` | string[]                               | Primary subtitle language priority for YouTube subtitle generation (default `["ja", "jpn"]`).                                                         |
+
+YouTube language targets are derived from subtitle config:
+
+- primary track: `youtubeSubgen.primarySubLanguages` (falls back to `["ja","jpn"]`)
+- secondary track: `secondarySub.secondarySubLanguages` (falls back to English when empty)
+
+Precedence for launcher defaults is: CLI flag > environment variable > `config.jsonc` > built-in default.
diff --git a/docs/development.md b/docs/development.md
new file mode 100644
index 0000000..1a8b3ba
--- /dev/null
+++ b/docs/development.md
@@ -0,0 +1,170 @@
+# Development
+
+## Prerequisites
+
+- [Bun](https://bun.sh)
+
+## Setup
+
+```bash
+git clone --recurse-submodules https://github.com/ksyasuda/SubMiner.git
+cd SubMiner
+# if you cloned without --recurse-submodules:
+git submodule update --init --recursive
+
+make deps
+# or manually:
+bun install
+(cd vendor/texthooker-ui && bun install --frozen-lockfile)
+```
+
+## Building
+
+```bash
+# TypeScript compile (fast, for development)
+bun run build
+
+# Generate launcher wrapper artifact
+make build-launcher
+# output: dist/launcher/subminer
+
+# Full platform build (includes texthooker-ui + AppImage/DMG)
+make build
+
+# Platform-specific builds
+make build-linux          # Linux AppImage
+make build-macos          # macOS DMG + ZIP (signed)
+make build-macos-unsigned # macOS DMG + ZIP (unsigned)
+```
+
+## Launcher Artifact Workflow
+
+- Source of truth: `launcher/*.ts`
+- Generated output: `dist/launcher/subminer`
+- Do not hand-edit generated launcher output.
+- Repo-root `./subminer` is a stale artifact path and is rejected by verification checks.
+- Install targets (`make install-linux`, `make install-macos`) copy from `dist/launcher/subminer`.
+
+Verify the workflow:
+
+```bash
+make build-launcher
+dist/launcher/subminer --help >/dev/null
+bash scripts/verify-generated-launcher.sh
+```
+
+## Running Locally
+
+```bash
+bun run dev    # builds + launches with --start --dev
+electron . --start --dev --log-level debug   # equivalent Electron launch with verbose logging
+electron . --background                       # tray/background mode, minimal default logging
+make dev-start                                # build + launch via Makefile
+```
+
+## Testing
+
+CI-equivalent local gate:
+
+```bash
+bun run tsc --noEmit
+bun run test:fast
+bun run test:launcher:smoke:src
+bun run build
+bun run test:smoke:dist
+bun run docs:build
+```
+
+Common focused commands:
+
+```bash
+bun run test:config       # Source-level config schema/validation tests
+bun run test:launcher     # Launcher regression tests (config discovery + command routing)
+bun run test:launcher:smoke:src # Launcher e2e smoke: launcher -> mpv IPC -> overlay start/stop wiring
+bun run test:core         # Source-level core regression tests (default lane)
+bun run test:fast         # Source-level config + core lane (no build prerequisite)
+```
+
+Dist-level tests are now an explicit smoke lane used to validate compiled/runtime assumptions.
+
+Launcher smoke artifacts are written to `.tmp/launcher-smoke` locally and uploaded by CI/release workflows when the smoke step fails.
+
+Smoke and optional deep dist commands:
+
+```bash
+bun run build                 # compile dist artifacts
+bun run test:smoke:dist       # explicit smoke scope for compiled runtime
+bun run test:config:dist      # optional full dist config suite
+bun run test:core:dist        # optional full dist core suite
+```
+
+`bun run test:subtitle` and `bun run test:subtitle:dist` are currently placeholders and do not run an active suite.
+
+## Config Generation
+
+```bash
+# Generate default config to ~/.config/SubMiner/config.jsonc
+make generate-config
+
+# Regenerate the repo's config.example.jsonc from centralized defaults
+make generate-example-config
+# or: bun run generate:config-example
+```
+
+## Documentation Site
+
+The docs use [VitePress](https://vitepress.dev/):
+
+```bash
+make docs-dev     # Dev server at http://localhost:5173
+make docs         # Build static output
+make docs-preview # Preview built site at http://localhost:4173
+```
+
+## Makefile Reference
+
+Run `make help` for a full list of targets. Key ones:
+
+| Target                 | Description                                                      |
+| ---------------------- | ---------------------------------------------------------------- |
+| `make build`           | Build platform package for detected OS                           |
+| `make build-launcher`  | Generate Bun launcher wrapper at `dist/launcher/subminer`        |
+| `make install`         | Install platform artifacts (wrapper, theme, AppImage/app bundle) |
+| `make install-plugin`  | Install mpv Lua plugin and config                                |
+| `make deps`            | Install JS dependencies (root + texthooker-ui)                   |
+| `make generate-config` | Generate default config from centralized registry                |
+| `make docs-dev`        | Run VitePress dev server                                         |
+
+## Contributor Notes
+
+- To add/change a config default, edit the matching domain file in `src/config/definitions/defaults-*.ts`.
+- To add/change config option metadata, edit the matching domain file in `src/config/definitions/options-*.ts`.
+- To add/change generated config template blocks/comments, update `src/config/definitions/template-sections.ts`.
+- Keep `src/config/definitions.ts` as the composed public API (`DEFAULT_CONFIG`, registries, template export) that wires domain modules together.
+- Overlay window/visibility state is owned by `src/core/services/overlay-manager.ts`.
+- Runtime architecture/module-boundary conventions are documented in [Architecture](/architecture); keep contributor changes aligned with that canonical guide.
+- Linux packaged desktop launches pass `--background` using electron-builder `build.linux.executableArgs` in `package.json`.
+- Prefer direct inline deps objects in `src/main/` modules for simple pass-through wiring.
+- Add a helper/adapter service only when it performs meaningful adaptation, validation, or reuse (not identity mapping).
+
+## Environment Variables
+
+| Variable                           | Description                                                                    |
+| ---------------------------------- | ------------------------------------------------------------------------------ |
+| `SUBMINER_APPIMAGE_PATH`           | Override SubMiner app binary path for launcher playback commands               |
+| `SUBMINER_BINARY_PATH`             | Alias for `SUBMINER_APPIMAGE_PATH`                                             |
+| `SUBMINER_ROFI_THEME`              | Override rofi theme path for launcher picker                                   |
+| `SUBMINER_LOG_LEVEL`               | Override app logger level (`debug`, `info`, `warn`, `error`)                   |
+| `SUBMINER_MPV_LOG`                 | Override mpv/app shared log file path                                          |
+| `SUBMINER_YT_SUBGEN_MODE`          | Override `youtubeSubgen.mode` for launcher                                     |
+| `SUBMINER_WHISPER_BIN`             | Override `youtubeSubgen.whisperBin` for launcher                               |
+| `SUBMINER_WHISPER_MODEL`           | Override `youtubeSubgen.whisperModel` for launcher                             |
+| `SUBMINER_YT_SUBGEN_OUT_DIR`       | Override generated subtitle output directory                                   |
+| `SUBMINER_YT_SUBGEN_AUDIO_FORMAT`  | Override extraction format used for whisper fallback                           |
+| `SUBMINER_YT_SUBGEN_KEEP_TEMP`     | Set to `1` to keep temporary subtitle-generation workspace                     |
+| `SUBMINER_JIMAKU_API_KEY`          | Override Jimaku API key for launcher subtitle downloads                        |
+| `SUBMINER_JIMAKU_API_KEY_COMMAND`  | Command used to resolve Jimaku API key at runtime                              |
+| `SUBMINER_JIMAKU_API_BASE_URL`     | Override Jimaku API base URL                                                   |
+| `SUBMINER_JELLYFIN_ACCESS_TOKEN`   | Override Jellyfin access token (used before stored encrypted session fallback) |
+| `SUBMINER_JELLYFIN_USER_ID`        | Optional Jellyfin user ID override                                             |
+| `SUBMINER_SKIP_MACOS_HELPER_BUILD` | Set to `1` to skip building the macOS helper binary during `bun run build`     |
diff --git a/docs/immersion-tracking.md b/docs/immersion-tracking.md
new file mode 100644
index 0000000..3c23166
--- /dev/null
+++ b/docs/immersion-tracking.md
@@ -0,0 +1,150 @@
+# Immersion Tracking Storage
+
+SubMiner stores immersion analytics in local SQLite (`immersion.sqlite`) by default.
+
+## Runtime Model
+
+- Write path is asynchronous and queue-backed.
+- Hot paths (subtitle parsing/render/token flows) enqueue telemetry/events and never await SQLite writes.
+- Queue overflow policy is deterministic: drop oldest queued writes, keep newest.
+- Flush policy defaults to `25` writes or `500ms` max delay.
+- SQLite pragmas: `journal_mode=WAL`, `synchronous=NORMAL`, `foreign_keys=ON`, `busy_timeout=2500`.
+
+## Schema (v1)
+
+Schema versioning table:
+
+- `imm_schema_version(schema_version PK, applied_at_ms)`
+
+Core entities:
+
+- `imm_videos`: video key/title/source metadata + optional media metadata fields
+- `imm_sessions`: session UUID, video reference, timing/status fields
+- `imm_session_telemetry`: high-frequency session aggregates over time
+- `imm_session_events`: event stream with compact numeric event types
+
+Rollups:
+
+- `imm_daily_rollups`
+- `imm_monthly_rollups`
+
+Primary index coverage:
+
+- session-by-video/time: `idx_sessions_video_started`
+- session-by-status/time: `idx_sessions_status_started`
+- timeline reads: `idx_telemetry_session_sample`
+- event timeline/type reads: `idx_events_session_ts`, `idx_events_type_ts`
+- rollup reads: `idx_rollups_day_video`, `idx_rollups_month_video`
+
+## Retention and Maintenance Defaults
+
+- Raw events: `7d`
+- Telemetry: `30d`
+- Daily rollups: `365d`
+- Monthly rollups: `5y`
+- Maintenance cadence: startup + every `24h`
+- Vacuum cadence: idle weekly (`7d` minimum spacing)
+
+Retention cleanup and rollup refresh stay in service maintenance orchestration + `src/core/services/immersion-tracker/maintenance.ts`.
+
+## Configurable Policy Knobs
+
+All knobs are under `immersionTracking` in config:
+
+- `batchSize`
+- `flushIntervalMs`
+- `queueCap`
+- `payloadCapBytes`
+- `maintenanceIntervalMs`
+- `retention.eventsDays`
+- `retention.telemetryDays`
+- `retention.dailyRollupsDays`
+- `retention.monthlyRollupsDays`
+- `retention.vacuumIntervalDays`
+
+These map directly to runtime tracker policy and allow tuning without code changes.
+
+## Query Templates
+
+Timeline for one session:
+
+```sql
+SELECT
+  sample_ms,
+  total_watched_ms,
+  active_watched_ms,
+  lines_seen,
+  words_seen,
+  tokens_seen,
+  cards_mined
+FROM imm_session_telemetry
+WHERE session_id = ?
+ORDER BY sample_ms DESC
+LIMIT ?;
+```
+
+Session throughput summary:
+
+```sql
+SELECT
+  s.session_id,
+  s.video_id,
+  s.started_at_ms,
+  s.ended_at_ms,
+  COALESCE(SUM(t.active_watched_ms), 0) AS active_watched_ms,
+  COALESCE(SUM(t.words_seen), 0) AS words_seen,
+  COALESCE(SUM(t.cards_mined), 0) AS cards_mined,
+  CASE
+    WHEN COALESCE(SUM(t.active_watched_ms), 0) > 0
+      THEN COALESCE(SUM(t.words_seen), 0) / (COALESCE(SUM(t.active_watched_ms), 0) / 60000.0)
+    ELSE NULL
+  END AS words_per_min,
+  CASE
+    WHEN COALESCE(SUM(t.active_watched_ms), 0) > 0
+      THEN (COALESCE(SUM(t.cards_mined), 0) * 60.0) / (COALESCE(SUM(t.active_watched_ms), 0) / 60000.0)
+    ELSE NULL
+  END AS cards_per_hour
+FROM imm_sessions s
+LEFT JOIN imm_session_telemetry t ON t.session_id = s.session_id
+GROUP BY s.session_id
+ORDER BY s.started_at_ms DESC
+LIMIT ?;
+```
+
+Daily rollups:
+
+```sql
+SELECT
+  rollup_day,
+  video_id,
+  total_sessions,
+  total_active_min,
+  total_lines_seen,
+  total_words_seen,
+  total_tokens_seen,
+  total_cards,
+  cards_per_hour,
+  words_per_min,
+  lookup_hit_rate
+FROM imm_daily_rollups
+ORDER BY rollup_day DESC, video_id DESC
+LIMIT ?;
+```
+
+Monthly rollups:
+
+```sql
+SELECT
+  rollup_month,
+  video_id,
+  total_sessions,
+  total_active_min,
+  total_lines_seen,
+  total_words_seen,
+  total_tokens_seen,
+  total_cards
+FROM imm_monthly_rollups
+ORDER BY rollup_month DESC, video_id DESC
+LIMIT ?;
+```
+
diff --git a/docs/index.assets.test.ts b/docs/index.assets.test.ts
new file mode 100644
index 0000000..d27bfd4
--- /dev/null
+++ b/docs/index.assets.test.ts
@@ -0,0 +1,14 @@
+import { expect, test } from 'bun:test';
+import { readFileSync } from 'node:fs';
+
+const docsIndexPath = new URL('./index.md', import.meta.url);
+const docsIndexContents = readFileSync(docsIndexPath, 'utf8');
+
+test('docs demo media uses shared cache-busting asset version token', () => {
+  expect(docsIndexContents).toMatch(/const demoAssetVersion = ['"][^'"]+['"]/);
+  expect(docsIndexContents).toContain(':poster="`/assets/minecard-poster.jpg?v=${demoAssetVersion}`"');
+  expect(docsIndexContents).toContain('<source :src="`/assets/minecard.webm?v=${demoAssetVersion}`" type="video/webm" />');
+  expect(docsIndexContents).toContain('<source :src="`/assets/minecard.mp4?v=${demoAssetVersion}`" type="video/mp4" />');
+  expect(docsIndexContents).toContain('<a :href="`/assets/minecard.webm?v=${demoAssetVersion}`" target="_blank" rel="noreferrer">');
+  expect(docsIndexContents).toContain('<img :src="`/assets/minecard.gif?v=${demoAssetVersion}`" alt="SubMiner demo GIF fallback" style="width: 100%; height: auto;" />');
+});
diff --git a/docs/index.md b/docs/index.md
new file mode 100644
index 0000000..335d430
--- /dev/null
+++ b/docs/index.md
@@ -0,0 +1,240 @@
+---
+layout: home
+
+title: SubMiner
+titleTemplate: Immersion Mining Workflow for MPV
+
+hero:
+  name: SubMiner
+  text: Immersion Mining for MPV
+  tagline: Watch media, mine vocabulary, and build cards without leaving the scene.
+  image:
+    src: /assets/SubMiner.png
+    alt: SubMiner logo
+  actions:
+    - theme: brand
+      text: Install
+      link: /installation
+    - theme: alt
+      text: Explore workflow
+      link: /mining-workflow
+
+features:
+  - icon:
+      src: /assets/mpv.svg
+      alt: mpv icon
+    title: Built for mpv
+    details: Tracks subtitles through mpv IPC in real time, with a single launch path and no external bridge services.
+  - icon:
+      src: /assets/yomitan-icon.svg
+      alt: Yomitan logo
+    title: Yomitan Integration
+    details: Keep your flow moving with instant word lookups and context-aware card creation directly from subtitles.
+  - icon:
+      src: /assets/anki-card.svg
+      alt: Anki card icon
+    title: Anki Card Enrichment
+    details: Auto-fills card fields with subtitle sentence, clipping, image, and translation so you can focus on learning.
+  - icon:
+      src: /assets/dual-layer.svg
+      alt: Dual layer icon
+    title: Three-Plane Overlay Stack
+    details: Secondary context plane + visible interactive layer + invisible interaction plane, each with independent behavior and startup state.
+  - icon:
+      src: /assets/highlight.svg
+      alt: Highlight icon
+    title: N+1 Highlighting
+    details: Surfaces known words from your deck so unknown targets stand out during immersion sessions.
+  - icon:
+      src: /assets/tokenization.svg
+      alt: Tokenization icon
+    title: Immersion Tracking
+    details: Captures subtitle and mining telemetry to SQLite, with daily/monthly rollups for progress clarity.
+  - icon:
+      src: /assets/subtitle-download.svg
+      alt: Subtitle download icon
+    title: Subtitle Download & Sync
+    details: Pull and synchronize subtitles with Jimaku plus alass/ffsubsync in one cohesive workflow.
+  - icon:
+      src: /assets/keyboard.svg
+      alt: Keyboard icon
+    title: Keyboard-Driven
+    details: Run lookups, mining actions, clipping, and workflow toggles with one configurable shortcut surface.
+  - icon:
+      src: /assets/texthooker.svg
+      alt: Texthooker icon
+    title: Texthooker & WebSocket
+    details: Stream subtitles in real time to browser tools via local WebSocket and keep your stack integrated.
+---
+
+<script setup>
+const demoAssetVersion = '20260223-2';
+</script>
+
+<div class="landing-shell">
+  <section class="workflow-section">
+    <h2>How it fits together</h2>
+    <div class="workflow-steps">
+      <div class="workflow-step">
+        <div class="step-number">01</div>
+        <div class="step-title">Start</div>
+        <div class="step-desc">Launch with the wrapper or existing mpv setup and keep subtitles in sync.</div>
+      </div>
+      <div class="workflow-step">
+        <div class="step-number">02</div>
+        <div class="step-title">Lookup</div>
+        <div class="step-desc">Hover or click a token in the interactive overlay to open Yomitan context.</div>
+      </div>
+      <div class="workflow-step">
+        <div class="step-number">03</div>
+        <div class="step-title">Mine</div>
+        <div class="step-desc">Create cards from Yomitan or mine sentence cards directly from subtitle lines.</div>
+      </div>
+      <div class="workflow-step">
+        <div class="step-number">04</div>
+        <div class="step-title">Enrich</div>
+        <div class="step-desc">Automatically attach timing-accurate audio, sentence text, and visual evidence.</div>
+      </div>
+      <div class="workflow-step">
+        <div class="step-number">05</div>
+        <div class="step-title">Track</div>
+        <div class="step-desc">Review immersion history and repeat high-value patterns over time.</div>
+      </div>
+    </div>
+  </section>
+
+  <section class="demo-section">
+    <h2>See it in action</h2>
+    <p>Subtitles, lookup flow, and card enrichment from a real playback session.</p>
+    <video controls playsinline preload="metadata" :poster="`/assets/minecard-poster.jpg?v=${demoAssetVersion}`">
+      <source :src="`/assets/minecard.webm?v=${demoAssetVersion}`" type="video/webm" />
+      <source :src="`/assets/minecard.mp4?v=${demoAssetVersion}`" type="video/mp4" />
+      <a :href="`/assets/minecard.webm?v=${demoAssetVersion}`" target="_blank" rel="noreferrer">
+        <img :src="`/assets/minecard.gif?v=${demoAssetVersion}`" alt="SubMiner demo GIF fallback" style="width: 100%; height: auto;" />
+      </a>
+    </video>
+  </section>
+</div>
+
+<style>
+@import url('https://fonts.googleapis.com/css2?family=Manrope:wght@400;500;600;700;800&family=Space+Grotesk:wght@500;600;700&display=swap');
+
+.landing-shell {
+  max-width: 1120px;
+  margin: 0 auto;
+  padding: 0.5rem 1rem 4rem;
+}
+
+.landing-shell,
+.landing-shell .step-title,
+.landing-shell h1,
+.landing-shell h2 {
+  font-family: 'Manrope', 'Arial', sans-serif;
+}
+
+.step-title,
+.step-number {
+  font-family: 'Space Grotesk', 'Manrope', 'Arial', sans-serif;
+  letter-spacing: -0.01em;
+}
+
+.demo-section {
+  max-width: 960px;
+  margin: 0 auto;
+  padding: 2rem 0 0;
+}
+
+.demo-section h2 {
+  font-size: 1.45rem;
+  font-weight: 600;
+  margin-bottom: 0.5rem;
+  letter-spacing: -0.01em;
+}
+
+.demo-section p {
+  color: var(--vp-c-text-2);
+  margin: 0 0 0.9rem;
+  line-height: 1.6;
+}
+
+.demo-section video {
+  width: 100%;
+  border-radius: 12px;
+  border: 1px solid var(--vp-c-divider);
+  box-shadow: 0 18px 44px rgba(0, 0, 0, 0.28);
+  animation: card-enter 380ms ease-out;
+}
+
+.workflow-section {
+  margin: 2.4rem auto 0;
+  padding: 0 0 2.5rem;
+}
+
+.workflow-section h2 {
+  font-size: 1.45rem;
+  font-weight: 600;
+  margin-bottom: 1rem;
+  letter-spacing: -0.01em;
+}
+
+.workflow-steps {
+  display: grid;
+  grid-template-columns: repeat(5, 1fr);
+  gap: 1px;
+  background: var(--vp-c-divider);
+  border-radius: 12px;
+  overflow: hidden;
+}
+
+@media (max-width: 960px) {
+  .workflow-steps {
+    grid-template-columns: repeat(3, 1fr);
+  }
+}
+
+@media (max-width: 640px) {
+  .workflow-steps {
+    grid-template-columns: 1fr;
+  }
+}
+
+.workflow-step {
+  padding: 1.1rem 1.25rem;
+  background: var(--vp-c-bg-soft);
+  animation: card-enter 330ms ease-out;
+}
+
+.workflow-step .step-number {
+  display: inline-block;
+  font-size: 0.7rem;
+  font-weight: 700;
+  letter-spacing: 0.05em;
+  color: var(--vp-c-brand-1);
+  margin-bottom: 0.5rem;
+  font-variant-numeric: tabular-nums;
+}
+
+.workflow-step .step-title {
+  font-weight: 600;
+  font-size: 1rem;
+  margin-bottom: 0.35rem;
+}
+
+.workflow-step .step-desc {
+  font-size: 0.85rem;
+  color: var(--vp-c-text-2);
+  line-height: 1.5;
+}
+
+@keyframes card-enter {
+  from {
+    opacity: 0.8;
+    transform: translateY(8px);
+  }
+
+  to {
+    opacity: 1;
+    transform: translateY(0);
+  }
+}
+</style>
diff --git a/docs/installation.md b/docs/installation.md
new file mode 100644
index 0000000..7061095
--- /dev/null
+++ b/docs/installation.md
@@ -0,0 +1,228 @@
+# Installation
+
+## Requirements
+
+### System Dependencies
+
+| Dependency           | Required   | Notes                                                    |
+| -------------------- | ---------- | -------------------------------------------------------- |
+| Bun                  | Yes        | Required for `subminer` wrapper and source workflows     |
+| mpv                  | Yes        | Must support IPC sockets (`--input-ipc-server`)          |
+| ffmpeg               | For media  | Audio extraction and screenshot generation               |
+| MeCab + mecab-ipadic | No         | Optional fallback tokenizer for Japanese                 |
+| fuse2                | Linux only | Required for AppImage                                    |
+| yt-dlp               | No         | Recommended for YouTube playback and subtitle extraction |
+
+### Platform-Specific
+
+**Linux** — one of the following compositors:
+
+- Hyprland (uses `hyprctl`)
+- Sway (uses `swaymsg`)
+- X11 (uses `xdotool` and `xwininfo`)
+
+**macOS** — macOS 10.13 or later. Accessibility permission required for window tracking.
+
+### Optional Tools
+
+| Tool              | Purpose                                                       |
+| ----------------- | ------------------------------------------------------------- |
+| fzf               | Terminal-based video picker (default)                         |
+| rofi              | GUI-based video picker                                        |
+| chafa             | Thumbnail previews in fzf                                     |
+| ffmpegthumbnailer | Generate video thumbnails for picker                          |
+| guessit           | Better AniSkip title/season/episode parsing for file playback |
+| alass             | Subtitle sync engine (preferred)                              |
+| ffsubsync         | Subtitle sync engine (fallback)                               |
+
+## Linux
+
+### AppImage (Recommended)
+
+Download the latest AppImage from [GitHub Releases](https://github.com/ksyasuda/SubMiner/releases/latest):
+
+```bash
+# Download and install AppImage
+wget https://github.com/ksyasuda/SubMiner/releases/download/v0.1.0/SubMiner-0.1.0.AppImage -O ~/.local/bin/SubMiner.AppImage
+chmod +x ~/.local/bin/SubMiner.AppImage
+
+# Download subminer wrapper script
+wget https://github.com/ksyasuda/SubMiner/releases/download/v0.1.0/subminer -O ~/.local/bin/subminer
+chmod +x ~/.local/bin/subminer
+```
+
+The `subminer` wrapper uses a Bun shebang (`#!/usr/bin/env bun`), so [Bun](https://bun.sh) must be installed and available on `PATH`.
+
+### From Source
+
+```bash
+git clone https://github.com/ksyasuda/SubMiner.git
+cd SubMiner
+make build
+make build-launcher
+
+# Install platform artifacts (wrapper + theme + AppImage)
+make install
+```
+
+`make build-launcher` generates the wrapper at `dist/launcher/subminer`. The checked-in launcher source remains `launcher/*.ts`.
+Do not use a repo-root `./subminer` artifact when building from source; workflow checks enforce `dist/launcher/subminer` as the only generated path.
+
+## macOS
+
+### DMG (Recommended)
+
+Download the **DMG** artifact from [GitHub Releases](https://github.com/ksyasuda/SubMiner/releases/latest). Open it and drag `SubMiner.app` into `/Applications`.
+
+A **ZIP** artifact is also available as a fallback — unzip and drag `SubMiner.app` into `/Applications`.
+
+Install dependencies using Homebrew:
+
+```bash
+brew install mpv mecab mecab-ipadic
+```
+
+### From Source (macOS)
+
+```bash
+git clone https://github.com/ksyasuda/SubMiner.git
+cd SubMiner
+bun install
+cd vendor/texthooker-ui && bun install --frozen-lockfile && bun run build && cd ../..
+bun run build:mac
+```
+
+The built app will be available in the `release` directory (`.dmg` and `.zip`).
+
+For unsigned local builds:
+
+```bash
+bun run build:mac:unsigned
+```
+
+### Accessibility Permission
+
+After launching SubMiner for the first time, grant accessibility permission:
+
+1. Open **System Preferences** → **Security & Privacy** → **Privacy** tab
+2. Select **Accessibility** from the left sidebar
+3. Add SubMiner to the list
+
+Without this permission, window tracking will not work and the overlay won't follow the mpv window.
+
+### macOS Usage Notes
+
+**Launching MPV with IPC:**
+
+```bash
+mpv --input-ipc-server=/tmp/subminer-socket video.mkv
+```
+
+**Config location:** `$XDG_CONFIG_HOME/SubMiner/config.jsonc` (or `~/.config/SubMiner/config.jsonc`).
+
+**MeCab paths (Homebrew):**
+
+- Apple Silicon (M1/M2): `/opt/homebrew/bin/mecab`
+- Intel: `/usr/local/bin/mecab`
+
+Ensure `mecab` is available on your PATH when launching SubMiner.
+
+**Fullscreen:** The overlay should appear correctly in fullscreen. If you encounter issues, check that accessibility permissions are granted.
+
+**mpv plugin binary path:**
+
+```ini
+binary_path=/Applications/SubMiner.app/Contents/MacOS/subminer
+```
+
+## Windows
+
+Windows support is available through the mpv plugin. Set the binary and socket path in `subminer.conf`:
+
+```ini
+binary_path=C:\\Program Files\\subminer\\subminer.exe
+socket_path=\\\\.\\pipe\\subminer-socket
+```
+
+Launch mpv with:
+
+```bash
+mpv --input-ipc-server=\\\\.\\pipe\\subminer-socket video.mkv
+```
+
+## MPV Plugin (Optional)
+
+The Lua plugin provides in-player keybindings to control the overlay from mpv. It communicates with SubMiner by invoking the binary with CLI flags.
+
+::: warning Important
+mpv must be launched with `--input-ipc-server=/tmp/subminer-socket` for SubMiner to connect.
+:::
+
+```bash
+# Option 1: install from release assets bundle
+wget https://github.com/ksyasuda/SubMiner/releases/latest/download/subminer-assets-0.1.0.tar.gz -O /tmp/subminer-assets.tar.gz
+tar -xzf /tmp/subminer-assets.tar.gz -C /tmp
+mkdir -p ~/.config/SubMiner
+cp /tmp/config.example.jsonc ~/.config/SubMiner/config.jsonc
+cp /tmp/plugin/subminer.lua ~/.config/mpv/scripts/
+cp /tmp/plugin/subminer.conf ~/.config/mpv/script-opts/
+
+# Option 2: from source checkout
+# make install-plugin
+```
+
+## Rofi Theme (Optional)
+
+SubMiner ships a default rofi theme at `assets/themes/subminer.rasi`.
+
+Install path (default auto-detected by `subminer`):
+
+- Linux: `~/.local/share/SubMiner/themes/subminer.rasi`
+- macOS: `~/Library/Application Support/SubMiner/themes/subminer.rasi`
+
+```bash
+mkdir -p ~/.local/share/SubMiner/themes
+cp /tmp/assets/themes/subminer.rasi ~/.local/share/SubMiner/themes/subminer.rasi
+```
+
+Override with `SUBMINER_ROFI_THEME=/absolute/path/to/theme.rasi`.
+
+All keybindings use a `y` chord prefix — press `y`, then the second key:
+
+| Chord | Action                                |
+| ----- | ------------------------------------- |
+| `y-y` | Open SubMiner menu (fuzzy-searchable) |
+| `y-s` | Start overlay                         |
+| `y-S` | Stop overlay                          |
+| `y-t` | Toggle visible overlay                |
+| `y-i` | Toggle invisible overlay              |
+| `y-I` | Show invisible overlay                |
+| `y-u` | Hide invisible overlay                |
+| `y-o` | Open Yomitan settings                 |
+| `y-r` | Restart overlay                       |
+| `y-c` | Check overlay status                  |
+
+See [MPV Plugin](/mpv-plugin) for the full configuration reference, script messages, and binary auto-detection details.
+
+## Verify Installation
+
+After installing, confirm SubMiner is working:
+
+```bash
+# Start the overlay (connects to mpv IPC)
+subminer --start video.mkv
+
+# Useful launch modes for troubleshooting
+subminer --log-level debug video.mkv
+SubMiner.AppImage --start --log-level debug
+
+# Or with direct AppImage control
+SubMiner.AppImage --background  # Background tray service mode
+SubMiner.AppImage --start
+SubMiner.AppImage --start --dev
+SubMiner.AppImage --help    # Show all CLI options
+```
+
+You should see the overlay appear over mpv. If subtitles are loaded in the video, they will appear as interactive text in the overlay.
+
+Next: [Usage](/usage) — learn about the `subminer` wrapper, keybindings, and YouTube playback.
diff --git a/docs/jellyfin-integration.md b/docs/jellyfin-integration.md
new file mode 100644
index 0000000..e295020
--- /dev/null
+++ b/docs/jellyfin-integration.md
@@ -0,0 +1,158 @@
+# Jellyfin Integration
+
+SubMiner includes an optional Jellyfin CLI integration for:
+
+- authenticating against a server
+- listing libraries and media items
+- launching item playback in the connected mpv instance
+- receiving Jellyfin remote cast-to-device playback events in-app
+- opening an in-app setup window for server/user/password input
+
+## Requirements
+
+- Jellyfin server URL and user credentials
+- For `--jellyfin-play`: connected mpv IPC socket (`--start` or existing mpv plugin workflow)
+
+## Setup
+
+1. Set base config values (`config.jsonc`):
+
+```jsonc
+{
+  "jellyfin": {
+    "enabled": true,
+    "serverUrl": "http://127.0.0.1:8096",
+    "username": "your-user",
+    "remoteControlEnabled": true,
+    "remoteControlAutoConnect": true,
+    "autoAnnounce": false,
+    "remoteControlDeviceName": "SubMiner",
+    "defaultLibraryId": "",
+    "pullPictures": false,
+    "iconCacheDir": "/tmp/subminer-jellyfin-icons",
+    "directPlayPreferred": true,
+    "directPlayContainers": ["mkv", "mp4", "webm", "mov", "flac", "mp3", "aac"],
+    "transcodeVideoCodec": "h264",
+  },
+}
+```
+
+2. Authenticate:
+
+```bash
+subminer jellyfin
+subminer jellyfin -l \
+  --server http://127.0.0.1:8096 \
+  --username your-user \
+  --password 'your-password'
+```
+
+3. List libraries:
+
+```bash
+SubMiner.AppImage --jellyfin-libraries
+```
+
+Launcher wrapper equivalent for interactive playback flow:
+
+```bash
+subminer jellyfin -p
+```
+
+Launcher wrapper for Jellyfin cast discovery mode (foreground app process):
+
+```bash
+subminer jellyfin -d
+```
+
+`subminer jf ...` is an alias for `subminer jellyfin ...`.
+
+To clear saved session credentials:
+
+```bash
+subminer jellyfin --logout
+```
+
+4. List items in a library:
+
+```bash
+SubMiner.AppImage --jellyfin-items --jellyfin-library-id LIBRARY_ID --jellyfin-search term
+```
+
+5. Start playback:
+
+```bash
+SubMiner.AppImage --start
+SubMiner.AppImage --jellyfin-play --jellyfin-item-id ITEM_ID
+```
+
+Optional stream overrides:
+
+- `--jellyfin-audio-stream-index N`
+- `--jellyfin-subtitle-stream-index N`
+
+## Playback Behavior
+
+- Direct play is attempted first when:
+  - `jellyfin.directPlayPreferred=true`
+  - media source supports direct stream
+  - source container matches `jellyfin.directPlayContainers`
+- If direct play is not selected/available, SubMiner requests a Jellyfin transcoded stream (`master.m3u8`) using `jellyfin.transcodeVideoCodec`.
+- Resume position (`PlaybackPositionTicks`) is applied via mpv seek.
+- Media title is set in mpv as `[Jellyfin/<mode>] <title>`.
+
+## Cast To Device Mode (jellyfin-mpv-shim style)
+
+When SubMiner is running with a valid Jellyfin session, it can appear as a
+remote playback target in Jellyfin's cast-to-device menu.
+
+### Requirements
+
+- `jellyfin.enabled=true`
+- valid `jellyfin.serverUrl` and Jellyfin auth session (env override or stored login session)
+- `jellyfin.remoteControlEnabled=true` (default)
+- `jellyfin.remoteControlAutoConnect=true` (default)
+- `jellyfin.autoAnnounce=false` by default (`true` enables auto announce/visibility check logs on connect)
+
+### Behavior
+
+- SubMiner connects to Jellyfin remote websocket and posts playback capabilities.
+- `Play` events open media in mpv with the same defaults used by `--jellyfin-play`.
+- If mpv IPC is not connected at cast time, SubMiner auto-launches mpv in idle mode with SubMiner defaults and retries playback.
+- `Playstate` events map to mpv pause/resume/seek/stop controls.
+- Stream selection commands (`SetAudioStreamIndex`, `SetSubtitleStreamIndex`) are mapped to mpv track selection.
+- SubMiner reports start/progress/stop timeline updates back to Jellyfin so now-playing and resume state stay synchronized.
+- `--jellyfin-remote-announce` forces an immediate capability re-broadcast and logs whether server sessions can see the device.
+
+### Troubleshooting
+
+- Device not visible in Jellyfin cast menu:
+  - ensure SubMiner is running
+  - ensure session token is valid (`--jellyfin-login` again if needed)
+  - ensure `remoteControlEnabled` and `remoteControlAutoConnect` are true
+- Cast command received but playback does not start:
+  - verify mpv IPC can connect (`--start` flow)
+  - verify item is playable from normal `--jellyfin-play --jellyfin-item-id ...`
+- Frequent reconnects:
+  - check Jellyfin server/network stability and token expiration
+
+## Failure Handling
+
+User-visible errors are shown through CLI logs and mpv OSD for:
+
+- invalid credentials
+- expired/invalid token
+- server/network errors
+- missing library/item identifiers
+- no playable source
+- mpv not connected for playback
+
+## Security Notes and Limitations
+
+- Jellyfin auth session (`accessToken` + `userId`) is stored in local encrypted token storage after login/setup.
+- Optional environment overrides are supported: `SUBMINER_JELLYFIN_ACCESS_TOKEN` and `SUBMINER_JELLYFIN_USER_ID`.
+- Treat both token storage and config files as secrets and avoid committing them.
+- Password is used only for login and is not stored.
+- Optional setup UI is available via `--jellyfin`; all actions are also available via CLI flags.
+- `subminer` wrapper uses Jellyfin subcommands (`subminer jellyfin ...`, alias `subminer jf ...`). Use `SubMiner.AppImage` for direct `--jellyfin-libraries` and `--jellyfin-items`.
+- For direct app CLI usage (`SubMiner.AppImage ...`), `--jellyfin-server` can override server URL for login/play flows without editing config.
diff --git a/docs/jlpt-vocab-bundle.md b/docs/jlpt-vocab-bundle.md
new file mode 100644
index 0000000..a24c59a
--- /dev/null
+++ b/docs/jlpt-vocab-bundle.md
@@ -0,0 +1,45 @@
+# JLPT Vocabulary Bundle (Offline)
+
+## Bundle location
+
+SubMiner expects the JLPT term-meta bank files to be available locally at:
+
+- `vendor/yomitan-jlpt-vocab`
+
+At runtime, SubMiner also searches these derived locations:
+
+- `vendor/yomitan-jlpt-vocab`
+- `vendor/yomitan-jlpt-vocab/vendor/yomitan-jlpt-vocab`
+- `vendor/yomitan-jlpt-vocab/yomitan-jlpt-vocab`
+
+and user-data/config fallback paths (see `getJlptDictionarySearchPaths` in `src/main.ts`).
+
+## Required files
+
+The expected files are:
+
+- `term_meta_bank_1.json`
+- `term_meta_bank_2.json`
+- `term_meta_bank_3.json`
+- `term_meta_bank_4.json`
+- `term_meta_bank_5.json`
+
+Each bank maps terms to frequency metadata; only entries with a `frequency.displayValue` are considered for JLPT tagging.
+
+SubMiner also reuses the same `term_meta_bank_*.json` format for frequency-based subtitle highlighting. The default frequency source is now bundled as `vendor/jiten_freq_global`, so users can enable `subtitleStyle.frequencyDictionary` without extra setup.
+
+## Source and update process
+
+For reproducible updates:
+
+1. Obtain the JLPT term-meta bank archive from the same upstream source that supplies the bundled Yomitan dictionary data.
+2. Extract the five `term_meta_bank_*.json` files.
+3. Place them into `vendor/yomitan-jlpt-vocab/`.
+4. Commit the update with the source URL/version in the task notes.
+
+This repository currently ships the folder path in `electron-builder` `extraResources` as:
+`vendor/yomitan-jlpt-vocab -> yomitan-jlpt-vocab`.
+
+## Fallback Behavior
+
+If bank files are missing, malformed, or lack expected metadata, SubMiner skips them gracefully. When no usable entries are found, JLPT underlining is silently disabled and subtitle rendering remains unchanged.
diff --git a/docs/launcher-script.md b/docs/launcher-script.md
new file mode 100644
index 0000000..0b74d2a
--- /dev/null
+++ b/docs/launcher-script.md
@@ -0,0 +1,98 @@
+# Launcher Script
+
+The `subminer` wrapper script is an all-in-one launcher that handles video selection, mpv startup, and overlay management. It's a Bun script distributed alongside the AppImage.
+
+## Video Picker
+
+When you run `subminer` without specifying a file, it opens an interactive video picker. By default it uses **fzf** in the terminal; pass `-R` to use **rofi** instead.
+
+### fzf (default)
+
+```bash
+subminer                        # pick from current directory
+subminer -d ~/Videos            # pick from a specific directory
+subminer -r -d ~/Anime          # recursive search
+```
+
+fzf shows video files in a fuzzy-searchable list. If `chafa` is installed, you get thumbnail previews in the right pane. Thumbnails are sourced from the freedesktop thumbnail cache first, then generated on the fly with `ffmpegthumbnailer` or `ffmpeg` as fallback.
+
+| Optional tool         | Purpose                          |
+| --------------------- | -------------------------------- |
+| `chafa`               | Render thumbnails in the terminal |
+| `ffmpegthumbnailer`   | Generate thumbnails on the fly   |
+
+### rofi
+
+```bash
+subminer -R                     # rofi picker, current directory
+subminer -R -d ~/Videos         # rofi picker, specific directory
+subminer -R -r -d ~/Anime       # rofi picker, recursive
+```
+
+rofi shows a GUI menu with icon thumbnails when available. SubMiner ships a custom rofi theme that can be installed from the release assets:
+
+```bash
+mkdir -p ~/.local/share/SubMiner/themes
+cp /tmp/assets/themes/subminer.rasi ~/.local/share/SubMiner/themes/subminer.rasi
+```
+
+The theme is auto-detected from these paths (first match wins):
+
+- `$SUBMINER_ROFI_THEME` environment variable (absolute path)
+- `$XDG_DATA_HOME/SubMiner/themes/subminer.rasi` (default: `~/.local/share/SubMiner/themes/subminer.rasi`)
+- `/usr/local/share/SubMiner/themes/subminer.rasi`
+- `/usr/share/SubMiner/themes/subminer.rasi`
+- macOS: `~/Library/Application Support/SubMiner/themes/subminer.rasi`
+
+Override with the `SUBMINER_ROFI_THEME` environment variable:
+
+```bash
+SUBMINER_ROFI_THEME=/path/to/custom-theme.rasi subminer -R
+```
+
+## Common Commands
+
+```bash
+subminer video.mkv              # play a specific file
+subminer --start video.mkv      # play + explicitly start overlay
+subminer https://youtu.be/...   # YouTube playback (requires yt-dlp)
+subminer ytsearch:"jp news"     # YouTube search
+```
+
+## Subcommands
+
+| Subcommand                | Purpose                                        |
+| ------------------------- | ---------------------------------------------- |
+| `subminer jellyfin` / `jf` | Jellyfin workflows (`-d` discovery, `-p` play, `-l` login) |
+| `subminer yt` / `youtube` | YouTube shorthand (`-o`, `-m`)                  |
+| `subminer doctor`         | Dependency + config + socket diagnostics        |
+| `subminer config path`    | Print active config file path                   |
+| `subminer config show`    | Print active config contents                    |
+| `subminer mpv status`     | Check mpv socket readiness                      |
+| `subminer mpv socket`     | Print active socket path                        |
+| `subminer mpv idle`       | Launch detached idle mpv instance               |
+| `subminer texthooker`     | Launch texthooker-only mode                     |
+| `subminer app`            | Pass arguments directly to SubMiner binary      |
+
+Use `subminer <subcommand> -h` for command-specific help.
+
+## Options
+
+| Flag                 | Description                                  |
+| -------------------- | -------------------------------------------- |
+| `-d, --directory`    | Video search directory (default: cwd)        |
+| `-r, --recursive`    | Search directories recursively               |
+| `-R, --rofi`         | Use rofi instead of fzf                      |
+| `-S, --start`        | Start overlay after mpv launches             |
+| `-T, --no-texthooker`| Disable texthooker server                    |
+| `-p, --profile`      | mpv profile name (default: `subminer`)       |
+| `-b, --backend`      | Force window backend (`hyprland`, `sway`, `x11`) |
+| `--log-level`        | Logger verbosity (`debug`, `info`, `warn`, `error`) |
+| `--dev`, `--debug`   | Enable app dev-mode (not tied to log level)  |
+
+## Logging
+
+- Default log level is `info`
+- `--background` mode defaults to `warn` unless `--log-level` is explicitly set
+- `--dev` / `--debug` control app behavior, not logging verbosity — use `--log-level` for that
+
diff --git a/docs/mining-workflow.md b/docs/mining-workflow.md
new file mode 100644
index 0000000..b156dc2
--- /dev/null
+++ b/docs/mining-workflow.md
@@ -0,0 +1,252 @@
+# Mining Workflow
+
+This guide walks through the sentence mining loop — from watching a video to creating Anki cards with audio, screenshots, and context.
+
+## Overview
+
+SubMiner runs as a transparent overlay on top of mpv. As subtitles play, the overlay displays them as interactive text. You click a word to look it up with Yomitan, then create an Anki card with a single action. SubMiner automatically attaches the sentence, audio clip, and screenshot.
+
+```text
+Watch video → See subtitle → Click word → Yomitan lookup → Add to Anki
+                                                              ↓
+                                              SubMiner auto-fills:
+                                              sentence, audio, image, translation
+```
+
+## Subtitle Delivery Path (Startup + Runtime)
+
+SubMiner now prioritizes subtitle responsiveness over heavy initialization:
+
+1. The first subtitle render is **plain text first** (no tokenization wait).
+2. Tokenized enrichment (word spans, known-word flags, JLPT/frequency metadata) is applied right after parsing completes.
+3. Under rapid subtitle churn, SubMiner uses a **latest-only tokenization queue** so stale lines are dropped instead of building lag.
+4. MeCab, Yomitan extension load, and dictionary prewarm run as background warmups after overlay initialization.
+
+This keeps early playback snappy and avoids mpv-side sluggishness while startup work completes.
+
+## The Three Overlay Planes
+
+SubMiner uses three overlay planes, each serving a different purpose.
+
+### Visible Overlay
+
+The visible overlay renders subtitles as tokenized, clickable word spans. Each word is a separate element with reading and headword data attached. This plane is styled independently from mpv subtitles and supports:
+
+- Word-level click targets for Yomitan lookup
+- Right-click to pause/resume
+- Right-click + drag to reposition subtitles
+- Modal dialogs for Jimaku search, field grouping, subsync, and runtime options
+- **N+1 highlighting** — known words from your Anki deck are visually highlighted
+
+Toggle with `Alt+Shift+O` (global) or `y-t` (mpv plugin).
+
+### Secondary Subtitle Plane
+
+The secondary plane is a compact top-strip layer for translation and context visibility while keeping primary reading flow below. It mirrors your configured secondary subtitle preference and can be independently shown or hidden.
+
+It is controlled by `secondarySub` configuration and shares lifecycle with the overlay stack.
+
+### Invisible Overlay
+
+The invisible overlay is a transparent layer aligned with mpv's own subtitle rendering. It uses mpv's subtitle metrics (font size, margins, position, scaling) to map click targets accurately.
+
+This layer still supports:
+
+- Word-level click-through lookups over the text region
+- Optional manual position fine-tuning in pixel mode
+- Independent toggle behavior with global shortcuts
+
+Position edit mode is available via `Ctrl/Cmd+Shift+P`, then arrow keys / `hjkl` to nudge position; `Shift` moves faster. Save with `Enter` or `Ctrl+S`, cancel with `Esc`.
+
+Toggle controls:
+
+- `Alt+Shift+O` / `y-t`: visible overlay
+- `Alt+Shift+I` / `y-i`: invisible overlay
+- Secondary plane visibility is controlled via `secondarySub` config and matching global shortcuts.
+
+## Looking Up Words
+
+### On the Visible Overlay
+
+1. Hover over the subtitle area — the overlay activates pointer events.
+2. Click a word. SubMiner selects it using Unicode-aware word boundary detection (`Intl.Segmenter`).
+3. Yomitan detects the text selection and opens its popup with dictionary results.
+4. From the Yomitan popup, you can add the word directly to Anki.
+
+### On the Invisible Overlay
+
+1. The invisible layer sits over mpv's own subtitle text.
+2. Click on any word in the subtitle — SubMiner maps your click position to the underlying text.
+3. On macOS, word selection happens automatically on hover.
+4. Yomitan popup appears for lookup and card creation.
+
+## Creating Anki Cards
+
+There are three ways to create cards, depending on your workflow.
+
+### 1. Auto-Update from Yomitan
+
+This is the most common flow. Yomitan creates a card in Anki, and SubMiner detects it via polling and enriches it automatically.
+
+1. Click a word → Yomitan popup appears.
+2. Click the Anki icon in Yomitan to add the word.
+3. SubMiner detects the new card (polls AnkiConnect every 3 seconds by default).
+4. SubMiner updates the card with:
+   - **Sentence**: The current subtitle line.
+   - **Audio**: Extracted from the video using the subtitle's start/end timing (plus configurable padding).
+   - **Image**: A screenshot or animated clip from the current playback position.
+   - **Translation**: From the secondary subtitle track, or generated via AI if configured.
+   - **MiscInfo**: Metadata like filename and timestamp.
+
+Configure which fields to fill in `ankiConnect.fields`. See [Anki Integration](/anki-integration) for details.
+
+### 2. Manual Update from Clipboard
+
+If you prefer a hands-on approach (animecards-style), you can copy the current subtitle to the clipboard and then paste it onto the last-added Anki card:
+
+1. Add a word via Yomitan as usual.
+2. Press `Ctrl/Cmd+C` to copy the current subtitle line to the clipboard.
+   - For multiple lines: press `Ctrl/Cmd+Shift+C`, then a digit `1`–`9` to select how many recent subtitle lines to combine. The combined text is copied to the clipboard.
+3. Press `Ctrl/Cmd+V` to update the last-added card with the clipboard contents plus audio, image, and translation — the same fields auto-update would fill.
+
+This is useful when auto-update polling is disabled or when you want explicit control over which subtitle line gets attached to the card.
+
+| Shortcut                    | Action                                    | Config key                            |
+| --------------------------- | ----------------------------------------- | ------------------------------------- |
+| `Ctrl/Cmd+C`               | Copy current subtitle                     | `shortcuts.copySubtitle`              |
+| `Ctrl/Cmd+Shift+C` + digit | Copy multiple recent lines                | `shortcuts.copySubtitleMultiple`      |
+| `Ctrl/Cmd+V`               | Update last card from clipboard           | `shortcuts.updateLastCardFromClipboard` |
+
+### 3. Mine Sentence (Hotkey)
+
+Create a standalone sentence card without going through Yomitan:
+
+- **Mine current sentence**: `Ctrl/Cmd+S` (configurable via `shortcuts.mineSentence`)
+- **Mine multiple lines**: `Ctrl/Cmd+Shift+S` followed by a digit 1–9 to select how many recent subtitle lines to combine.
+
+The sentence card uses the note type configured in `isLapis.sentenceCardModel` and always maps sentence/audio to `Sentence` and `SentenceAudio`.
+
+### 4. Mark as Audio Card
+
+After adding a word via Yomitan, press the audio card shortcut to overwrite the audio with a longer clip spanning the full subtitle timing.
+
+## Secondary Subtitles
+
+SubMiner can display a secondary subtitle track (typically English) alongside the primary Japanese subtitles. This is useful for:
+
+- Quick comprehension checks without leaving the mining flow.
+- Auto-populating the translation field on mined cards.
+
+### Display Modes
+
+Cycle through modes with the configured shortcut:
+
+- **Hidden**: Secondary subtitle not shown.
+- **Visible**: Always displayed below the primary subtitle.
+- **Hover**: Only shown when you hover over the primary subtitle.
+
+When a card is created, SubMiner uses the secondary subtitle text as the translation field value (unless AI translation is configured to override it).
+
+## Field Grouping (Kiku)
+
+If you mine the same word from different sentences, SubMiner can merge the cards instead of creating duplicates. This feature is designed for use with [Kiku](https://github.com/youyoumu/kiku) and similar note types that support grouped fields.
+
+### How It Works
+
+1. You add a word via Yomitan.
+2. SubMiner detects the new card and checks if a card with the same expression already exists.
+3. If a duplicate is found:
+   - **Auto mode** (`fieldGrouping: "auto"`): Merges automatically. Both sentences, audio clips, and images are combined into the existing card. The duplicate is optionally deleted.
+   - **Manual mode** (`fieldGrouping: "manual"`): A modal appears showing both cards side by side. You choose which card to keep and preview the merged result before confirming.
+
+### What Gets Merged
+
+- **Sentence fields**: Both sentences kept, marked with `[Original]` and `[Duplicate]`.
+- **Audio fields**: Both audio clips preserved as separate `[sound:...]` entries.
+- **Image fields**: Both images preserved.
+
+Configure in `ankiConnect.isKiku`. See [Anki Integration](/anki-integration#field-grouping-kiku) for the full reference.
+
+## Jimaku Subtitle Search
+
+SubMiner integrates with [Jimaku](https://jimaku.cc) to search and download subtitle files for anime directly from the overlay.
+
+1. Open the Jimaku modal via the configured shortcut (`Ctrl+Shift+J` by default).
+2. SubMiner auto-fills the search from the current video filename (title, season, episode).
+3. Browse matching entries and select a subtitle file to download.
+4. The subtitle is loaded into mpv as a new track.
+
+Requires an internet connection. An API key (`jimaku.apiKey`) is optional but recommended for higher rate limits.
+
+## Texthooker
+
+SubMiner runs a local HTTP server at `http://127.0.0.1:5174` (configurable port) that serves a texthooker UI. This allows external tools — such as a browser-based Yomitan instance — to receive subtitle text in real time.
+
+The texthooker page displays the current subtitle and updates as new lines arrive. This is useful if you prefer to do lookups in a browser rather than through the overlay's built-in Yomitan.
+
+## Subtitle Sync (Subsync)
+
+If your subtitle file is out of sync with the audio, SubMiner can resynchronize it using [alass](https://github.com/kaegi/alass) or [ffsubsync](https://github.com/smacke/ffsubsync).
+
+1. Open the subsync modal from the overlay.
+2. Select the sync engine (alass or ffsubsync).
+3. For alass, select a reference subtitle track from the video.
+4. SubMiner runs the sync and reloads the corrected subtitle.
+
+Install the sync tools separately — see [Troubleshooting](/troubleshooting#subtitle-sync-subsync) if the tools are not found.
+
+## N+1 Word Highlighting
+
+When enabled, SubMiner highlights words you already know in your Anki deck, making it easier to spot new (N+1) vocabulary during immersion.
+
+### How It Works
+
+1. SubMiner periodically syncs with Anki to build a local cache of known words (expressions/headwords from your configured decks)
+2. As subtitles appear, known words are visually highlighted in the visible overlay
+3. Unknown words remain unhighlighted — these are your potential mining targets
+
+### Enabling N+1 Mode
+
+```json
+{
+  "ankiConnect": {
+    "nPlusOne": {
+      "highlightEnabled": true,
+      "refreshMinutes": 1440,
+      "matchMode": "headword",
+      "minSentenceWords": 3,
+      "decks": ["Learning::Japanese"]
+    }
+  }
+}
+```
+
+| Option             | Description                                                                         |
+| ------------------ | ----------------------------------------------------------------------------------- |
+| `highlightEnabled` | Turn on/off the highlighting feature                                                |
+| `refreshMinutes`   | How often to refresh the known-word cache (default: 1440 = daily)                   |
+| `matchMode`        | `"headword"` (dictionary form) or `"surface"` (exact text match)                    |
+| `minSentenceWords` | Minimum sentence length in tokens required to allow N+1 highlighting (default: `3`) |
+| `decks`            | Which Anki decks to consider "known" (empty = uses `ankiConnect.deck`)              |
+
+### Use Cases
+
+- **Immersion tracking**: Quickly identify which sentences contain only known words vs. those with new vocabulary
+- **Mining focus**: Target sentences with exactly one unknown word (true N+1)
+- **Progress visualization**: See your growing vocabulary visually represented in real content
+
+### Immersion Tracking Storage
+
+Immersion data is persisted to SQLite when enabled in `immersionTracking`:
+
+```json
+{
+  "immersionTracking": {
+    "enabled": true,
+    "dbPath": ""
+  }
+}
+```
+
+- `dbPath` can be empty (default) to use SubMiner’s app-data `immersion.sqlite`.
+- Set an explicit path to move the database (for backups, cloud syncing, or easier inspection).
diff --git a/docs/mpv-plugin.md b/docs/mpv-plugin.md
new file mode 100644
index 0000000..bb37208
--- /dev/null
+++ b/docs/mpv-plugin.md
@@ -0,0 +1,229 @@
+# MPV Plugin
+
+The SubMiner mpv plugin (`subminer.lua`) provides in-player keybindings to control the overlay without leaving mpv. It communicates with SubMiner by invoking the AppImage (or binary) with CLI flags.
+
+## Installation
+
+```bash
+# From release bundle:
+wget https://github.com/ksyasuda/SubMiner/releases/latest/download/subminer-assets-0.1.0.tar.gz -O /tmp/subminer-assets.tar.gz
+tar -xzf /tmp/subminer-assets.tar.gz -C /tmp
+mkdir -p ~/.config/SubMiner
+cp /tmp/config.example.jsonc ~/.config/SubMiner/config.jsonc
+cp /tmp/plugin/subminer.lua ~/.config/mpv/scripts/
+cp /tmp/plugin/subminer.conf ~/.config/mpv/script-opts/
+# Or from source checkout: make install-plugin
+```
+
+mpv must have IPC enabled for SubMiner to connect:
+
+```ini
+# ~/.config/mpv/mpv.conf
+input-ipc-server=/tmp/subminer-socket
+```
+
+## Keybindings
+
+All keybindings use a `y` chord prefix — press `y`, then the second key:
+
+| Chord | Action                   |
+| ----- | ------------------------ |
+| `y-y` | Open menu                |
+| `y-s` | Start overlay            |
+| `y-S` | Stop overlay             |
+| `y-t` | Toggle visible overlay   |
+| `y-i` | Toggle invisible overlay |
+| `y-I` | Show invisible overlay   |
+| `y-u` | Hide invisible overlay   |
+| `y-o` | Open settings window     |
+| `y-r` | Restart overlay          |
+| `y-c` | Check status             |
+| `y-k` | Skip intro (AniSkip)     |
+
+## Menu
+
+Press `y-y` to open an interactive menu in mpv's OSD:
+
+```text
+SubMiner:
+1. Start overlay
+2. Stop overlay
+3. Toggle overlay
+4. Toggle invisible overlay
+5. Open options
+6. Restart overlay
+7. Check status
+```
+
+Select an item by pressing its number.
+
+## Configuration
+
+Create or edit `~/.config/mpv/script-opts/subminer.conf`:
+
+```ini
+# Path to SubMiner binary. Leave empty for auto-detection.
+binary_path=
+
+# MPV IPC socket path. Must match input-ipc-server in mpv.conf.
+socket_path=/tmp/subminer-socket
+
+# Enable the texthooker WebSocket server.
+texthooker_enabled=yes
+
+# Port for the texthooker server.
+texthooker_port=5174
+
+# Window manager backend: auto, hyprland, sway, x11, macos.
+backend=auto
+
+# Start the overlay automatically when a file is loaded.
+auto_start=no
+
+# Show the visible overlay on auto-start.
+auto_start_visible_overlay=no
+
+# Invisible overlay startup: platform-default, visible, hidden.
+# platform-default = hidden on Linux, visible on macOS/Windows.
+auto_start_invisible_overlay=platform-default
+
+# Show OSD messages for overlay status changes.
+osd_messages=yes
+
+# Logging level: debug, info, warn, error.
+log_level=info
+
+# Enable AniSkip intro detection/markers.
+aniskip_enabled=yes
+
+# Optional title override (launcher fills from guessit when available).
+aniskip_title=
+
+# Optional season override (launcher fills from guessit when available).
+aniskip_season=
+
+# Optional MAL ID override. Leave blank to resolve from media title.
+aniskip_mal_id=
+
+# Optional episode override. Leave blank to detect from filename/title.
+aniskip_episode=
+
+# Show OSD skip button while inside intro range.
+aniskip_show_button=yes
+
+# OSD label + keybinding for intro skip action.
+aniskip_button_text=You can skip by pressing %s
+aniskip_button_key=y-k
+aniskip_button_duration=3
+```
+
+### Option Reference
+
+| Option                         | Default                | Values                                     | Description                      |
+| ------------------------------ | ---------------------- | ------------------------------------------ | -------------------------------- |
+| `binary_path`                  | `""` (auto-detect)     | file path                                  | Path to SubMiner binary          |
+| `socket_path`                  | `/tmp/subminer-socket` | file path                                  | MPV IPC socket path              |
+| `texthooker_enabled`           | `yes`                  | `yes` / `no`                               | Enable texthooker server         |
+| `texthooker_port`              | `5174`                 | 1–65535                                    | Texthooker server port           |
+| `backend`                      | `auto`                 | `auto`, `hyprland`, `sway`, `x11`, `macos` | Window manager backend           |
+| `auto_start`                   | `no`                   | `yes` / `no`                               | Auto-start overlay on file load  |
+| `auto_start_visible_overlay`   | `no`                   | `yes` / `no`                               | Show visible layer on auto-start |
+| `auto_start_invisible_overlay` | `platform-default`     | `platform-default`, `visible`, `hidden`    | Invisible layer on auto-start    |
+| `osd_messages`                 | `yes`                  | `yes` / `no`                               | Show OSD status messages         |
+| `log_level`                    | `info`                 | `debug`, `info`, `warn`, `error`           | Log verbosity                    |
+| `aniskip_enabled`              | `yes`                  | `yes` / `no`                               | Enable AniSkip intro detection   |
+| `aniskip_title`                | `""`                   | string                                     | Override title used for lookup   |
+| `aniskip_season`               | `""`                   | numeric season                             | Optional season hint             |
+| `aniskip_mal_id`               | `""`                   | numeric MAL id                             | Skip title lookup; use fixed id  |
+| `aniskip_episode`              | `""`                   | numeric episode                            | Skip episode parsing; use fixed  |
+| `aniskip_show_button`          | `yes`                  | `yes` / `no`                               | Show in-range intro skip prompt  |
+| `aniskip_button_text`          | `You can skip by pressing %s` | string                              | OSD prompt format (`%s`=key)     |
+| `aniskip_button_key`           | `y-k`                  | mpv key chord                              | Primary key for intro skip action (`y-k` always works as fallback) |
+| `aniskip_button_duration`      | `3`                    | float seconds                              | OSD hint duration                |
+
+## Binary Auto-Detection
+
+When `binary_path` is empty, the plugin searches platform-specific locations:
+
+**Linux:**
+
+1. `~/.local/bin/SubMiner.AppImage`
+2. `/opt/SubMiner/SubMiner.AppImage`
+3. `/usr/local/bin/SubMiner`
+4. `/usr/bin/SubMiner`
+
+**macOS:**
+
+1. `/Applications/SubMiner.app/Contents/MacOS/SubMiner`
+2. `~/Applications/SubMiner.app/Contents/MacOS/SubMiner`
+
+**Windows:**
+
+1. `C:\Program Files\SubMiner\SubMiner.exe`
+2. `C:\Program Files (x86)\SubMiner\SubMiner.exe`
+3. `C:\SubMiner\SubMiner.exe`
+
+## Backend Detection
+
+When `backend=auto`, the plugin detects the window manager:
+
+1. **macOS** — detected via platform or `OSTYPE`.
+2. **Hyprland** — detected via `HYPRLAND_INSTANCE_SIGNATURE`.
+3. **Sway** — detected via `SWAYSOCK`.
+4. **X11** — detected via `XDG_SESSION_TYPE=x11` or `DISPLAY`.
+5. **Fallback** — defaults to X11 with a warning.
+
+## Script Messages
+
+The plugin can be controlled from other mpv scripts or the mpv command line using script messages:
+
+```
+script-message subminer-start
+script-message subminer-stop
+script-message subminer-toggle
+script-message subminer-toggle-invisible
+script-message subminer-show-invisible
+script-message subminer-hide-invisible
+script-message subminer-menu
+script-message subminer-options
+script-message subminer-restart
+script-message subminer-status
+script-message subminer-aniskip-refresh
+script-message subminer-skip-intro
+```
+
+The `subminer-start` message accepts overrides:
+
+```
+script-message subminer-start backend=hyprland socket=/custom/path texthooker=no log-level=debug
+```
+
+`log-level` here controls only logging verbosity passed to SubMiner.
+`--debug` is a separate app/dev-mode flag in the main CLI and should not be used here for logging.
+
+## AniSkip Intro Skip
+
+- On file load, plugin resolves title + episode, resolves MAL id, then calls AniSkip API.
+- When launched via `subminer`, launcher runs `guessit` first (file targets) and passes title/season/episode to the plugin; fallback is filename-derived title.
+- Install `guessit` for best detection quality (`python3 -m pip install --user guessit`).
+- If OP interval exists, plugin adds `AniSkip Intro Start` and `AniSkip Intro End` chapters.
+- At intro start, plugin shows an OSD hint for the first 3 seconds (`You can skip by pressing y-k` by default).
+- Use `script-message subminer-aniskip-refresh` after changing media metadata/options to retry lookup.
+
+## Lifecycle
+
+- **File loaded**: If `auto_start=yes`, the plugin starts the overlay and applies visibility preferences after a short delay.
+- **MPV shutdown**: The plugin sends a stop command to gracefully shut down both the overlay and the texthooker server.
+- **Texthooker**: Starts as a separate subprocess before the overlay to ensure the app lock is acquired first.
+
+## Using with the `subminer` Wrapper
+
+The `subminer` wrapper script handles mpv launch, socket setup, and overlay lifecycle automatically. You do not need the plugin if you always use the wrapper.
+
+The plugin is useful when you:
+
+- Launch mpv from other tools (file managers, media centers).
+- Want on-demand overlay control without the wrapper.
+- Use mpv's built-in file browser or playlist features.
+
+You can install both — the plugin provides chord keybindings for convenience, while the wrapper handles the full lifecycle.
diff --git a/docs/public/apple-touch-icon.png b/docs/public/apple-touch-icon.png
new file mode 100644
index 0000000..7d70768
Binary files /dev/null and b/docs/public/apple-touch-icon.png differ
diff --git a/docs/public/assets/SubMiner.png b/docs/public/assets/SubMiner.png
new file mode 100644
index 0000000..ed163b0
Binary files /dev/null and b/docs/public/assets/SubMiner.png differ
diff --git a/docs/public/assets/anki-card.svg b/docs/public/assets/anki-card.svg
new file mode 100644
index 0000000..bf9d4aa
--- /dev/null
+++ b/docs/public/assets/anki-card.svg
@@ -0,0 +1,15 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="48" height="48" viewBox="0 0 48 48" fill="none">
+  <defs>
+    <linearGradient id="ac" x1="6" y1="6" x2="36" y2="42" gradientUnits="userSpaceOnUse">
+      <stop stop-color="#34d399"/>
+      <stop offset="1" stop-color="#059669"/>
+    </linearGradient>
+  </defs>
+  <rect x="12" y="5" width="24" height="34" rx="3" fill="#059669" opacity="0.18"/>
+  <rect x="8" y="9" width="24" height="34" rx="3" fill="url(#ac)"/>
+  <rect x="13" y="18" width="14" height="2.5" rx="1.25" fill="white" opacity="0.85"/>
+  <rect x="13" y="24" width="10" height="2.5" rx="1.25" fill="white" opacity="0.4"/>
+  <rect x="13" y="30" width="12" height="2.5" rx="1.25" fill="white" opacity="0.4"/>
+  <path d="M39.5 8l1.8 4.2 4.2 1.8-4.2 1.8L39.5 20l-1.8-4.2L33.5 14l4.2-1.8z" fill="#34d399"/>
+  <path d="M36 27l1 2.3 2.3 1-2.3 1L36 33.5l-1-2.2-2.3-1 2.3-1z" fill="#34d399" opacity="0.45"/>
+</svg>
diff --git a/docs/public/assets/demo-poster.jpg b/docs/public/assets/demo-poster.jpg
new file mode 100644
index 0000000..ad030fd
Binary files /dev/null and b/docs/public/assets/demo-poster.jpg differ
diff --git a/docs/public/assets/dual-layer.svg b/docs/public/assets/dual-layer.svg
new file mode 100644
index 0000000..c1ba38c
--- /dev/null
+++ b/docs/public/assets/dual-layer.svg
@@ -0,0 +1,15 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="48" height="48" viewBox="0 0 48 48" fill="none">
+  <defs>
+    <linearGradient id="dl" x1="4" y1="24" x2="44" y2="24" gradientUnits="userSpaceOnUse">
+      <stop stop-color="#818cf8"/>
+      <stop offset="1" stop-color="#6366f1"/>
+    </linearGradient>
+  </defs>
+  <rect x="4" y="6" width="40" height="14" rx="4" fill="#818cf8" opacity="0.12"/>
+  <rect x="4" y="6" width="40" height="14" rx="4" stroke="#818cf8" stroke-width="1.5" stroke-dasharray="4 3" fill="none" opacity="0.55"/>
+  <rect x="10" y="11" width="20" height="3" rx="1.5" fill="#818cf8" opacity="0.35"/>
+  <line x1="24" y1="22" x2="24" y2="26" stroke="#a5b4fc" stroke-width="1.5" stroke-linecap="round" opacity="0.5"/>
+  <path d="M21.5 24.5L24 27l2.5-2.5" stroke="#a5b4fc" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round" fill="none" opacity="0.5"/>
+  <rect x="4" y="28" width="40" height="14" rx="4" fill="url(#dl)"/>
+  <rect x="10" y="33" width="20" height="3" rx="1.5" fill="white" opacity="0.85"/>
+</svg>
diff --git a/docs/public/assets/highlight.svg b/docs/public/assets/highlight.svg
new file mode 100644
index 0000000..98edbaa
--- /dev/null
+++ b/docs/public/assets/highlight.svg
@@ -0,0 +1,13 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="48" height="48" viewBox="0 0 48 48" fill="none">
+  <defs>
+    <linearGradient id="hl" x1="20" y1="14" x2="38" y2="34" gradientUnits="userSpaceOnUse">
+      <stop stop-color="#fbbf24"/>
+      <stop offset="1" stop-color="#f59e0b"/>
+    </linearGradient>
+  </defs>
+  <rect x="2" y="17" width="10" height="14" rx="3" fill="#fbbf24" opacity="0.3"/>
+  <rect x="14" y="17" width="7" height="14" rx="3" fill="#fbbf24" opacity="0.3"/>
+  <rect x="23" y="13" width="13" height="22" rx="3.5" fill="url(#hl)"/>
+  <rect x="38" y="17" width="8" height="14" rx="3" fill="#fbbf24" opacity="0.3"/>
+  <path d="M28.2 4l1 2.4 2.4 1-2.4 1-1 2.4-1-2.4-2.4-1 2.4-1z" fill="#fbbf24" opacity="0.7"/>
+</svg>
diff --git a/docs/public/assets/keyboard.svg b/docs/public/assets/keyboard.svg
new file mode 100644
index 0000000..8148d13
--- /dev/null
+++ b/docs/public/assets/keyboard.svg
@@ -0,0 +1,21 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="48" height="48" viewBox="0 0 48 48" fill="none">
+  <defs>
+    <linearGradient id="kb" x1="2" y1="10" x2="46" y2="42" gradientUnits="userSpaceOnUse">
+      <stop stop-color="#c084fc"/>
+      <stop offset="1" stop-color="#7c3aed"/>
+    </linearGradient>
+  </defs>
+  <rect x="2" y="12" width="44" height="30" rx="5" fill="url(#kb)" opacity="0.12"/>
+  <rect x="2" y="12" width="44" height="30" rx="5" stroke="url(#kb)" stroke-width="1.5" fill="none"/>
+  <rect x="6" y="16" width="8" height="6" rx="2" fill="url(#kb)"/>
+  <rect x="16" y="16" width="8" height="6" rx="2" fill="url(#kb)" opacity="0.35"/>
+  <rect x="26" y="16" width="8" height="6" rx="2" fill="url(#kb)" opacity="0.35"/>
+  <rect x="36" y="16" width="8" height="6" rx="2" fill="url(#kb)" opacity="0.35"/>
+  <rect x="6" y="24" width="8" height="6" rx="2" fill="url(#kb)" opacity="0.35"/>
+  <rect x="16" y="24" width="8" height="6" rx="2" fill="url(#kb)" opacity="0.35"/>
+  <rect x="26" y="24" width="8" height="6" rx="2" fill="url(#kb)" opacity="0.35"/>
+  <rect x="36" y="24" width="8" height="6" rx="2" fill="url(#kb)"/>
+  <rect x="6" y="32" width="8" height="6" rx="2" fill="url(#kb)" opacity="0.35"/>
+  <rect x="16" y="32" width="16" height="6" rx="2" fill="url(#kb)" opacity="0.35"/>
+  <rect x="34" y="32" width="10" height="6" rx="2" fill="url(#kb)" opacity="0.35"/>
+</svg>
diff --git a/docs/public/assets/kiku-integration-poster.jpg b/docs/public/assets/kiku-integration-poster.jpg
new file mode 100644
index 0000000..9f23cd0
Binary files /dev/null and b/docs/public/assets/kiku-integration-poster.jpg differ
diff --git a/docs/public/assets/kiku-integration.webm b/docs/public/assets/kiku-integration.webm
new file mode 100644
index 0000000..bb995f0
Binary files /dev/null and b/docs/public/assets/kiku-integration.webm differ
diff --git a/docs/public/assets/minecard-poster.jpg b/docs/public/assets/minecard-poster.jpg
new file mode 100644
index 0000000..a1e8139
Binary files /dev/null and b/docs/public/assets/minecard-poster.jpg differ
diff --git a/docs/public/assets/minecard.gif b/docs/public/assets/minecard.gif
new file mode 100644
index 0000000..a288825
Binary files /dev/null and b/docs/public/assets/minecard.gif differ
diff --git a/docs/public/assets/minecard.mkv b/docs/public/assets/minecard.mkv
new file mode 100644
index 0000000..6b1cff6
Binary files /dev/null and b/docs/public/assets/minecard.mkv differ
diff --git a/docs/public/assets/minecard.mp4 b/docs/public/assets/minecard.mp4
new file mode 100644
index 0000000..3017ec2
Binary files /dev/null and b/docs/public/assets/minecard.mp4 differ
diff --git a/docs/public/assets/minecard.png b/docs/public/assets/minecard.png
new file mode 100644
index 0000000..3d8c767
Binary files /dev/null and b/docs/public/assets/minecard.png differ
diff --git a/docs/public/assets/minecard.webm b/docs/public/assets/minecard.webm
new file mode 100644
index 0000000..ae930fe
Binary files /dev/null and b/docs/public/assets/minecard.webm differ
diff --git a/docs/public/assets/mpv.svg b/docs/public/assets/mpv.svg
new file mode 100644
index 0000000..5e7355e
--- /dev/null
+++ b/docs/public/assets/mpv.svg
@@ -0,0 +1,86 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg
+   xmlns:dc="http://purl.org/dc/elements/1.1/"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   width="64"
+   height="64"
+   viewBox="0 0 63.999999 63.999999"
+   id="svg2"
+   version="1.1"
+   inkscape:version="0.91 r13725"
+   sodipodi:docname="mpv.svg">
+  <defs
+     id="defs4" />
+  <sodipodi:namedview
+     id="base"
+     pagecolor="#ffffff"
+     bordercolor="#666666"
+     borderopacity="1.0"
+     inkscape:pageopacity="0.0"
+     inkscape:pageshadow="2"
+     inkscape:zoom="5.3710484"
+     inkscape:cx="10.112865"
+     inkscape:cy="18.643164"
+     inkscape:document-units="px"
+     inkscape:current-layer="layer1"
+     showgrid="false"
+     units="px"
+     inkscape:window-width="1920"
+     inkscape:window-height="1016"
+     inkscape:window-x="0"
+     inkscape:window-y="27"
+     inkscape:window-maximized="1" />
+  <metadata
+     id="metadata7">
+    <rdf:RDF>
+      <cc:Work
+         rdf:about="">
+        <dc:format>image/svg+xml</dc:format>
+        <dc:type
+           rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
+        <dc:title></dc:title>
+      </cc:Work>
+    </rdf:RDF>
+  </metadata>
+  <g
+     inkscape:label="Layer 1"
+     inkscape:groupmode="layer"
+     id="layer1"
+     transform="translate(0,-988.3622)">
+    <circle
+       style="opacity:1;fill:#e5e5e5;fill-opacity:1;fill-rule:nonzero;stroke:none;stroke-width:0.10161044;stroke-linecap:round;stroke-linejoin:bevel;stroke-miterlimit:1;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:0.99215686"
+       id="path4380"
+       cx="32"
+       cy="1020.3622"
+       r="27.949194" />
+    <circle
+       style="opacity:1;fill:#672168;fill-opacity:1;fill-rule:nonzero;stroke:none;stroke-width:0.0988237;stroke-linecap:round;stroke-linejoin:bevel;stroke-miterlimit:1;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:0.99215686"
+       id="path4390"
+       cx="32.727058"
+       cy="1019.5079"
+       r="25.950588" />
+    <circle
+       style="opacity:1;fill:#420143;fill-opacity:1;fill-rule:nonzero;stroke:none;stroke-width:0.1;stroke-linecap:round;stroke-linejoin:bevel;stroke-miterlimit:1;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:0.99215686"
+       id="path4400"
+       cx="34.224396"
+       cy="1017.7957"
+       r="20" />
+    <path
+       style="fill:#dddbdd;fill-opacity:1;fill-rule:evenodd;stroke:none;stroke-width:0.1;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
+       d="m 44.481446,1020.4807 a 12.848894,12.848894 0 0 1 -12.84889,12.8489 12.848894,12.848894 0 0 1 -12.8489,-12.8489 12.848894,12.848894 0 0 1 12.8489,-12.8489 12.848894,12.848894 0 0 1 12.84889,12.8489 z"
+       id="path4412"
+       inkscape:connector-curvature="0" />
+    <path
+       style="fill:#691f69;fill-opacity:1;fill-rule:evenodd;stroke:none;stroke-width:0.1;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
+       d="m 28.374316,1014.709 0,11.4502 9.21608,-5.8647 z"
+       id="path4426"
+       inkscape:connector-curvature="0" />
+  </g>
+</svg>
diff --git a/docs/public/assets/subtitle-download.svg b/docs/public/assets/subtitle-download.svg
new file mode 100644
index 0000000..76f7dc9
--- /dev/null
+++ b/docs/public/assets/subtitle-download.svg
@@ -0,0 +1,16 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="48" height="48" viewBox="0 0 48 48" fill="none">
+  <defs>
+    <linearGradient id="sd" x1="4" y1="4" x2="44" y2="44" gradientUnits="userSpaceOnUse">
+      <stop stop-color="#22d3ee"/>
+      <stop offset="1" stop-color="#0891b2"/>
+    </linearGradient>
+  </defs>
+  <rect x="8" y="4" width="24" height="32" rx="3" fill="url(#sd)" opacity="0.15"/>
+  <rect x="8" y="4" width="24" height="32" rx="3" stroke="url(#sd)" stroke-width="1.5" fill="none"/>
+  <rect x="13" y="12" width="14" height="2.5" rx="1.25" fill="#22d3ee" opacity="0.5"/>
+  <rect x="13" y="18" width="10" height="2.5" rx="1.25" fill="#22d3ee" opacity="0.35"/>
+  <rect x="13" y="24" width="12" height="2.5" rx="1.25" fill="#22d3ee" opacity="0.35"/>
+  <line x1="38" y1="16" x2="38" y2="32" stroke="url(#sd)" stroke-width="2.5" stroke-linecap="round"/>
+  <path d="M33 28l5 5 5-5" stroke="url(#sd)" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round" fill="none"/>
+  <line x1="33" y1="40" x2="43" y2="40" stroke="url(#sd)" stroke-width="2" stroke-linecap="round" opacity="0.5"/>
+</svg>
diff --git a/docs/public/assets/texthooker.svg b/docs/public/assets/texthooker.svg
new file mode 100644
index 0000000..4da1998
--- /dev/null
+++ b/docs/public/assets/texthooker.svg
@@ -0,0 +1,19 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="48" height="48" viewBox="0 0 48 48" fill="none">
+  <defs>
+    <linearGradient id="th" x1="4" y1="6" x2="44" y2="42" gradientUnits="userSpaceOnUse">
+      <stop stop-color="#f97316"/>
+      <stop offset="1" stop-color="#c2410c"/>
+    </linearGradient>
+  </defs>
+  <rect x="4" y="6" width="30" height="36" rx="4" fill="url(#th)" opacity="0.12"/>
+  <rect x="4" y="6" width="30" height="36" rx="4" stroke="url(#th)" stroke-width="1.5" fill="none"/>
+  <rect x="9" y="14" width="14" height="2.5" rx="1.25" fill="#f97316" opacity="0.6"/>
+  <rect x="9" y="20" width="18" height="2.5" rx="1.25" fill="#f97316" opacity="0.4"/>
+  <rect x="9" y="26" width="12" height="2.5" rx="1.25" fill="#f97316" opacity="0.4"/>
+  <rect x="9" y="32" width="16" height="2.5" rx="1.25" fill="#f97316" opacity="0.4"/>
+  <circle cx="40" cy="18" r="3.5" fill="url(#th)" opacity="0.8"/>
+  <circle cx="40" cy="30" r="3.5" fill="url(#th)" opacity="0.8"/>
+  <line x1="36" y1="18" x2="34" y2="18" stroke="url(#th)" stroke-width="1.5" stroke-linecap="round" opacity="0.6"/>
+  <line x1="36" y1="30" x2="34" y2="30" stroke="url(#th)" stroke-width="1.5" stroke-linecap="round" opacity="0.6"/>
+  <line x1="40" y1="21.5" x2="40" y2="26.5" stroke="url(#th)" stroke-width="1.5" stroke-linecap="round" opacity="0.5"/>
+</svg>
diff --git a/docs/public/assets/tokenization.svg b/docs/public/assets/tokenization.svg
new file mode 100644
index 0000000..b74b8db
--- /dev/null
+++ b/docs/public/assets/tokenization.svg
@@ -0,0 +1,16 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="48" height="48" viewBox="0 0 48 48" fill="none">
+  <defs>
+    <linearGradient id="tk" x1="0" y1="14" x2="48" y2="34" gradientUnits="userSpaceOnUse">
+      <stop stop-color="#22d3ee"/>
+      <stop offset="1" stop-color="#0891b2"/>
+    </linearGradient>
+  </defs>
+  <rect x="2" y="12" width="12" height="24" rx="3.5" fill="url(#tk)"/>
+  <rect x="18" y="12" width="12" height="24" rx="3.5" fill="url(#tk)"/>
+  <rect x="34" y="12" width="12" height="24" rx="3.5" fill="url(#tk)"/>
+  <line x1="15.5" y1="10" x2="15.5" y2="38" stroke="#22d3ee" stroke-width="1.5" stroke-linecap="round" stroke-dasharray="3 3" opacity="0.45"/>
+  <line x1="32.5" y1="10" x2="32.5" y2="38" stroke="#22d3ee" stroke-width="1.5" stroke-linecap="round" stroke-dasharray="3 3" opacity="0.45"/>
+  <rect x="5" y="22" width="6" height="2.5" rx="1.25" fill="white" opacity="0.7"/>
+  <rect x="21" y="22" width="6" height="2.5" rx="1.25" fill="white" opacity="0.7"/>
+  <rect x="37" y="22" width="6" height="2.5" rx="1.25" fill="white" opacity="0.7"/>
+</svg>
diff --git a/docs/public/assets/video.svg b/docs/public/assets/video.svg
new file mode 100644
index 0000000..8436c6e
--- /dev/null
+++ b/docs/public/assets/video.svg
@@ -0,0 +1,12 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="48" height="48" viewBox="0 0 48 48" fill="none">
+  <defs>
+    <linearGradient id="vd" x1="4" y1="10" x2="44" y2="38" gradientUnits="userSpaceOnUse">
+      <stop stop-color="#fb7185"/>
+      <stop offset="1" stop-color="#e11d48"/>
+    </linearGradient>
+  </defs>
+  <rect x="4" y="10" width="40" height="28" rx="4" fill="url(#vd)" opacity="0.15"/>
+  <rect x="4" y="10" width="40" height="28" rx="4" stroke="url(#vd)" stroke-width="1.5" fill="none"/>
+  <path d="M20 18l12 6-12 6z" fill="url(#vd)"/>
+  <rect x="10" y="32" width="22" height="2.5" rx="1.25" fill="white" opacity="0.4"/>
+</svg>
diff --git a/docs/public/assets/yomitan-icon.svg b/docs/public/assets/yomitan-icon.svg
new file mode 100644
index 0000000..3756901
--- /dev/null
+++ b/docs/public/assets/yomitan-icon.svg
@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16"><defs><linearGradient id="a" x1="11.876" x2="4.014" y1="4.073" y2="11.935" gradientUnits="userSpaceOnUse"><stop offset="0" stop-color="#bc00ff" stop-opacity=".941" style="stop-color:#bc00ff;stop-opacity:1"/><stop offset="1" stop-color="#00b9fe"/></linearGradient></defs><rect width="16" height="16" fill="url(#a)" rx="1.625" ry="1.625"/><path d="M2 2v2h3v3H2v2h3v3H2v2h5V2Zm7 0v2h5V2Zm0 5v2h5V7Zm0 5v2h5v-2z" shape-rendering="crispEdges" style="fill:#fff"/></svg>
diff --git a/docs/public/config.example.jsonc b/docs/public/config.example.jsonc
new file mode 100644
index 0000000..f7f4926
--- /dev/null
+++ b/docs/public/config.example.jsonc
@@ -0,0 +1,340 @@
+/**
+ * SubMiner Example Configuration File
+ *
+ * This file is auto-generated from src/config/definitions.ts.
+ * Copy to $XDG_CONFIG_HOME/SubMiner/config.jsonc (or ~/.config/SubMiner/config.jsonc) and edit as needed.
+ */
+{
+
+  // ==========================================
+  // Overlay Auto-Start
+  // When overlay connects to mpv, automatically show overlay and hide mpv subtitles.
+  // ==========================================
+  "auto_start_overlay": false, // When overlay connects to mpv, automatically show overlay and hide mpv subtitles. Values: true | false
+
+  // ==========================================
+  // Visible Overlay Subtitle Binding
+  // Control whether visible overlay toggles also toggle MPV subtitle visibility.
+  // When enabled, visible overlay hides MPV subtitles; when disabled, MPV subtitles are left unchanged.
+  // ==========================================
+  "bind_visible_overlay_to_mpv_sub_visibility": true, // Link visible overlay toggles to MPV subtitle visibility (primary and secondary). Values: true | false
+
+  // ==========================================
+  // Texthooker Server
+  // Control whether browser opens automatically for texthooker.
+  // ==========================================
+  "texthooker": {
+    "openBrowser": true // Open browser setting. Values: true | false
+  }, // Control whether browser opens automatically for texthooker.
+
+  // ==========================================
+  // WebSocket Server
+  // Built-in WebSocket server broadcasts subtitle text to connected clients.
+  // Auto mode disables built-in server if mpv_websocket is detected.
+  // ==========================================
+  "websocket": {
+    "enabled": "auto", // Built-in subtitle websocket server mode. Values: auto | true | false
+    "port": 6677 // Built-in subtitle websocket server port.
+  }, // Built-in WebSocket server broadcasts subtitle text to connected clients.
+
+  // ==========================================
+  // Logging
+  // Controls logging verbosity.
+  // Set to debug for full runtime diagnostics.
+  // ==========================================
+  "logging": {
+    "level": "info" // Minimum log level for runtime logging. Values: debug | info | warn | error
+  }, // Controls logging verbosity.
+
+  // ==========================================
+  // Keyboard Shortcuts
+  // Overlay keyboard shortcuts. Set a shortcut to null to disable.
+  // Hot-reload: shortcut changes apply live and update the session help modal on reopen.
+  // ==========================================
+  "shortcuts": {
+    "toggleVisibleOverlayGlobal": "Alt+Shift+O", // Toggle visible overlay global setting.
+    "toggleInvisibleOverlayGlobal": "Alt+Shift+I", // Toggle invisible overlay global setting.
+    "copySubtitle": "CommandOrControl+C", // Copy subtitle setting.
+    "copySubtitleMultiple": "CommandOrControl+Shift+C", // Copy subtitle multiple setting.
+    "updateLastCardFromClipboard": "CommandOrControl+V", // Update last card from clipboard setting.
+    "triggerFieldGrouping": "CommandOrControl+G", // Trigger field grouping setting.
+    "triggerSubsync": "Ctrl+Alt+S", // Trigger subsync setting.
+    "mineSentence": "CommandOrControl+S", // Mine sentence setting.
+    "mineSentenceMultiple": "CommandOrControl+Shift+S", // Mine sentence multiple setting.
+    "multiCopyTimeoutMs": 3000, // Timeout for multi-copy/mine modes.
+    "toggleSecondarySub": "CommandOrControl+Shift+V", // Toggle secondary sub setting.
+    "markAudioCard": "CommandOrControl+Shift+A", // Mark audio card setting.
+    "openRuntimeOptions": "CommandOrControl+Shift+O", // Open runtime options setting.
+    "openJimaku": "Ctrl+Shift+J" // Open jimaku setting.
+  }, // Overlay keyboard shortcuts. Set a shortcut to null to disable.
+
+  // ==========================================
+  // Invisible Overlay
+  // Startup behavior for the invisible interactive subtitle mining layer.
+  // Invisible subtitle position edit mode: Ctrl/Cmd+Shift+P to toggle, arrow keys to move, Enter or Ctrl/Cmd+S to save, Esc to cancel.
+  // This edit-mode shortcut is fixed and is not currently configurable.
+  // ==========================================
+  "invisibleOverlay": {
+    "startupVisibility": "platform-default" // Startup visibility setting.
+  }, // Startup behavior for the invisible interactive subtitle mining layer.
+
+  // ==========================================
+  // Keybindings (MPV Commands)
+  // Extra keybindings that are merged with built-in defaults.
+  // Set command to null to disable a default keybinding.
+  // Hot-reload: keybinding changes apply live and update the session help modal on reopen.
+  // ==========================================
+  "keybindings": [], // Extra keybindings that are merged with built-in defaults.
+
+  // ==========================================
+  // Secondary Subtitles
+  // Dual subtitle track options.
+  // Used by subminer YouTube subtitle generation as secondary language preferences.
+  // Hot-reload: defaultMode updates live while SubMiner is running.
+  // ==========================================
+  "secondarySub": {
+    "secondarySubLanguages": [], // Secondary sub languages setting.
+    "autoLoadSecondarySub": false, // Auto load secondary sub setting. Values: true | false
+    "defaultMode": "hover" // Default mode setting.
+  }, // Dual subtitle track options.
+
+  // ==========================================
+  // Auto Subtitle Sync
+  // Subsync engine and executable paths.
+  // ==========================================
+  "subsync": {
+    "defaultMode": "auto", // Subsync default mode. Values: auto | manual
+    "alass_path": "", // Alass path setting.
+    "ffsubsync_path": "", // Ffsubsync path setting.
+    "ffmpeg_path": "" // Ffmpeg path setting.
+  }, // Subsync engine and executable paths.
+
+  // ==========================================
+  // Subtitle Position
+  // Initial vertical subtitle position from the bottom.
+  // ==========================================
+  "subtitlePosition": {
+    "yPercent": 10 // Y percent setting.
+  }, // Initial vertical subtitle position from the bottom.
+
+  // ==========================================
+  // Subtitle Appearance
+  // Primary and secondary subtitle styling.
+  // Hot-reload: subtitle style changes apply live without restarting SubMiner.
+  // ==========================================
+  "subtitleStyle": {
+    "enableJlpt": false, // Enable JLPT vocabulary level underlines. When disabled, JLPT tagging lookup and underlines are skipped. Values: true | false
+    "preserveLineBreaks": false, // Preserve line breaks in visible overlay subtitle rendering. When false, line breaks are flattened to spaces for a single-line flow. Values: true | false
+    "hoverTokenColor": "#c6a0f6", // Hex color used for hovered subtitle token highlight in mpv.
+    "fontFamily": "M PLUS 1, Noto Sans CJK JP Regular, Noto Sans CJK JP, Hiragino Sans, Hiragino Kaku Gothic ProN, Yu Gothic, Arial Unicode MS, Arial, sans-serif", // Font family setting.
+    "fontSize": 35, // Font size setting.
+    "fontColor": "#cad3f5", // Font color setting.
+    "fontWeight": "normal", // Font weight setting.
+    "fontStyle": "normal", // Font style setting.
+    "backgroundColor": "rgb(30, 32, 48, 0.88)", // Background color setting.
+    "nPlusOneColor": "#c6a0f6", // N plus one color setting.
+    "knownWordColor": "#a6da95", // Known word color setting.
+    "jlptColors": {
+      "N1": "#ed8796", // N1 setting.
+      "N2": "#f5a97f", // N2 setting.
+      "N3": "#f9e2af", // N3 setting.
+      "N4": "#a6e3a1", // N4 setting.
+      "N5": "#8aadf4" // N5 setting.
+    }, // Jlpt colors setting.
+    "frequencyDictionary": {
+      "enabled": false, // Enable frequency-dictionary-based highlighting based on token rank. Values: true | false
+      "sourcePath": "", // Optional absolute path to a frequency dictionary directory. If empty, built-in discovery search paths are used.
+      "topX": 1000, // Only color tokens with frequency rank <= topX (default: 1000).
+      "mode": "single", // single: use one color for all matching tokens. banded: use color ramp by frequency band. Values: single | banded
+      "singleColor": "#f5a97f", // Color used when frequencyDictionary.mode is `single`.
+      "bandedColors": [
+        "#ed8796",
+        "#f5a97f",
+        "#f9e2af",
+        "#a6e3a1",
+        "#8aadf4"
+      ] // Five colors used for rank bands when mode is `banded` (from most common to least within topX).
+    }, // Frequency dictionary setting.
+    "secondary": {
+      "fontSize": 24, // Font size setting.
+      "fontColor": "#ffffff", // Font color setting.
+      "backgroundColor": "transparent", // Background color setting.
+      "fontWeight": "normal", // Font weight setting.
+      "fontStyle": "normal", // Font style setting.
+      "fontFamily": "M PLUS 1, Noto Sans CJK JP Regular, Noto Sans CJK JP, Hiragino Sans, Hiragino Kaku Gothic ProN, Yu Gothic, Arial Unicode MS, Arial, sans-serif" // Font family setting.
+    } // Secondary setting.
+  }, // Primary and secondary subtitle styling.
+
+  // ==========================================
+  // AnkiConnect Integration
+  // Automatic Anki updates and media generation options.
+  // Hot-reload: AI translation settings update live while SubMiner is running.
+  // Most other AnkiConnect settings still require restart.
+  // ==========================================
+  "ankiConnect": {
+    "enabled": false, // Enable AnkiConnect integration. Values: true | false
+    "url": "http://127.0.0.1:8765", // Url setting.
+    "pollingRate": 3000, // Polling interval in milliseconds.
+    "tags": [
+      "SubMiner"
+    ], // Tags to add to cards mined or updated by SubMiner. Provide an empty array to disable automatic tagging.
+    "fields": {
+      "audio": "ExpressionAudio", // Audio setting.
+      "image": "Picture", // Image setting.
+      "sentence": "Sentence", // Sentence setting.
+      "miscInfo": "MiscInfo", // Misc info setting.
+      "translation": "SelectionText" // Translation setting.
+    }, // Fields setting.
+    "ai": {
+      "enabled": false, // Enabled setting. Values: true | false
+      "alwaysUseAiTranslation": false, // Always use ai translation setting. Values: true | false
+      "apiKey": "", // Api key setting.
+      "model": "openai/gpt-4o-mini", // Model setting.
+      "baseUrl": "https://openrouter.ai/api", // Base url setting.
+      "targetLanguage": "English", // Target language setting.
+      "systemPrompt": "You are a translation engine. Return only the translated text with no explanations." // System prompt setting.
+    }, // Ai setting.
+    "media": {
+      "generateAudio": true, // Generate audio setting. Values: true | false
+      "generateImage": true, // Generate image setting. Values: true | false
+      "imageType": "static", // Image type setting.
+      "imageFormat": "jpg", // Image format setting.
+      "imageQuality": 92, // Image quality setting.
+      "animatedFps": 10, // Animated fps setting.
+      "animatedMaxWidth": 640, // Animated max width setting.
+      "animatedCrf": 35, // Animated crf setting.
+      "audioPadding": 0.5, // Audio padding setting.
+      "fallbackDuration": 3, // Fallback duration setting.
+      "maxMediaDuration": 30 // Max media duration setting.
+    }, // Media setting.
+    "behavior": {
+      "overwriteAudio": true, // Overwrite audio setting. Values: true | false
+      "overwriteImage": true, // Overwrite image setting. Values: true | false
+      "mediaInsertMode": "append", // Media insert mode setting.
+      "highlightWord": true, // Highlight word setting. Values: true | false
+      "notificationType": "osd", // Notification type setting.
+      "autoUpdateNewCards": true // Automatically update newly added cards. Values: true | false
+    }, // Behavior setting.
+    "nPlusOne": {
+      "highlightEnabled": false, // Enable fast local highlighting for words already known in Anki. Values: true | false
+      "refreshMinutes": 1440, // Minutes between known-word cache refreshes.
+      "matchMode": "headword", // Known-word matching strategy for N+1 highlighting. Values: headword | surface
+      "decks": [], // Decks used for N+1 known-word cache scope. Supports one or more deck names.
+      "minSentenceWords": 3, // Minimum sentence word count required for N+1 targeting (default: 3).
+      "nPlusOne": "#c6a0f6", // Color used for the single N+1 target token highlight.
+      "knownWord": "#a6da95" // Color used for legacy known-word highlights.
+    }, // N plus one setting.
+    "metadata": {
+      "pattern": "[SubMiner] %f (%t)" // Pattern setting.
+    }, // Metadata setting.
+    "isLapis": {
+      "enabled": false, // Enabled setting. Values: true | false
+      "sentenceCardModel": "Japanese sentences" // Sentence card model setting.
+    }, // Is lapis setting.
+    "isKiku": {
+      "enabled": false, // Enabled setting. Values: true | false
+      "fieldGrouping": "disabled", // Kiku duplicate-card field grouping mode. Values: auto | manual | disabled
+      "deleteDuplicateInAuto": true // Delete duplicate in auto setting. Values: true | false
+    } // Is kiku setting.
+  }, // Automatic Anki updates and media generation options.
+
+  // ==========================================
+  // Jimaku
+  // Jimaku API configuration and defaults.
+  // ==========================================
+  "jimaku": {
+    "apiBaseUrl": "https://jimaku.cc", // Api base url setting.
+    "languagePreference": "ja", // Preferred language used in Jimaku search. Values: ja | en | none
+    "maxEntryResults": 10 // Maximum Jimaku search results returned.
+  }, // Jimaku API configuration and defaults.
+
+  // ==========================================
+  // YouTube Subtitle Generation
+  // Defaults for subminer YouTube subtitle extraction/transcription mode.
+  // ==========================================
+  "youtubeSubgen": {
+    "mode": "automatic", // YouTube subtitle generation mode for the launcher script. Values: automatic | preprocess | off
+    "whisperBin": "", // Path to whisper.cpp CLI used as fallback transcription engine.
+    "whisperModel": "", // Path to whisper model used for fallback transcription.
+    "primarySubLanguages": [
+      "ja",
+      "jpn"
+    ] // Comma-separated primary subtitle language priority used by the launcher.
+  }, // Defaults for subminer YouTube subtitle extraction/transcription mode.
+
+  // ==========================================
+  // Anilist
+  // Anilist API credentials and update behavior.
+  // ==========================================
+  "anilist": {
+    "enabled": false, // Enable AniList post-watch progress updates. Values: true | false
+    "accessToken": "" // Optional explicit AniList access token override; leave empty to use locally stored token from setup.
+  }, // Anilist API credentials and update behavior.
+
+  // ==========================================
+  // Jellyfin
+  // Optional Jellyfin integration for auth, browsing, and playback launch.
+  // Access token is stored in local encrypted token storage after login/setup.
+  // jellyfin.accessToken remains an optional explicit override in config.
+  // ==========================================
+  "jellyfin": {
+    "enabled": false, // Enable optional Jellyfin integration and CLI control commands. Values: true | false
+    "serverUrl": "", // Base Jellyfin server URL (for example: http://localhost:8096).
+    "username": "", // Default Jellyfin username used during CLI login.
+    "deviceId": "subminer", // Device id setting.
+    "clientName": "SubMiner", // Client name setting.
+    "clientVersion": "0.1.0", // Client version setting.
+    "defaultLibraryId": "", // Optional default Jellyfin library ID for item listing.
+    "remoteControlEnabled": true, // Enable Jellyfin remote cast control mode. Values: true | false
+    "remoteControlAutoConnect": true, // Auto-connect to the configured remote control target. Values: true | false
+    "autoAnnounce": false, // When enabled, automatically trigger remote announce/visibility check on websocket connect. Values: true | false
+    "remoteControlDeviceName": "SubMiner", // Device name reported for Jellyfin remote control sessions.
+    "pullPictures": false, // Enable Jellyfin poster/icon fetching for launcher menus. Values: true | false
+    "iconCacheDir": "/tmp/subminer-jellyfin-icons", // Directory used by launcher for cached Jellyfin poster icons.
+    "directPlayPreferred": true, // Try direct play before server-managed transcoding when possible. Values: true | false
+    "directPlayContainers": [
+      "mkv",
+      "mp4",
+      "webm",
+      "mov",
+      "flac",
+      "mp3",
+      "aac"
+    ], // Container allowlist for direct play decisions.
+    "transcodeVideoCodec": "h264" // Preferred transcode video codec when direct play is unavailable.
+  }, // Optional Jellyfin integration for auth, browsing, and playback launch.
+
+  // ==========================================
+  // Discord Rich Presence
+  // Optional Discord Rich Presence activity card updates for current playback/study session.
+  // Uses official SubMiner Discord app assets for polished card visuals.
+  // ==========================================
+  "discordPresence": {
+    "enabled": false, // Enable optional Discord Rich Presence updates. Values: true | false
+    "updateIntervalMs": 3000, // Minimum interval between presence payload updates.
+    "debounceMs": 750 // Debounce delay used to collapse bursty presence updates.
+  }, // Optional Discord Rich Presence activity card updates for current playback/study session.
+
+  // ==========================================
+  // Immersion Tracking
+  // Enable/disable immersion tracking.
+  // Set dbPath to override the default sqlite database location.
+  // Policy tuning is available for queue, flush, and retention values.
+  // ==========================================
+  "immersionTracking": {
+    "enabled": true, // Enable immersion tracking for mined subtitle metadata. Values: true | false
+    "dbPath": "", // Optional SQLite database path for immersion tracking. Empty value uses the default app data path.
+    "batchSize": 25, // Buffered telemetry/event writes per SQLite transaction.
+    "flushIntervalMs": 500, // Max delay before queue flush in milliseconds.
+    "queueCap": 1000, // In-memory write queue cap before overflow policy applies.
+    "payloadCapBytes": 256, // Max JSON payload size per event before truncation.
+    "maintenanceIntervalMs": 86400000, // Maintenance cadence (prune + rollup + vacuum checks).
+    "retention": {
+      "eventsDays": 7, // Raw event retention window in days.
+      "telemetryDays": 30, // Telemetry retention window in days.
+      "dailyRollupsDays": 365, // Daily rollup retention window in days.
+      "monthlyRollupsDays": 1825, // Monthly rollup retention window in days.
+      "vacuumIntervalDays": 7 // Minimum days between VACUUM runs.
+    } // Retention setting.
+  } // Enable/disable immersion tracking.
+}
diff --git a/docs/public/favicon-16x16.png b/docs/public/favicon-16x16.png
new file mode 100644
index 0000000..213e5f2
Binary files /dev/null and b/docs/public/favicon-16x16.png differ
diff --git a/docs/public/favicon-32x32.png b/docs/public/favicon-32x32.png
new file mode 100644
index 0000000..b576da5
Binary files /dev/null and b/docs/public/favicon-32x32.png differ
diff --git a/docs/public/favicon.ico b/docs/public/favicon.ico
new file mode 100644
index 0000000..dcdbe5d
Binary files /dev/null and b/docs/public/favicon.ico differ
diff --git a/docs/reports/2026-02-22-task-100-dead-code-report.md b/docs/reports/2026-02-22-task-100-dead-code-report.md
new file mode 100644
index 0000000..daf3a6d
--- /dev/null
+++ b/docs/reports/2026-02-22-task-100-dead-code-report.md
@@ -0,0 +1,54 @@
+# TASK-100 Dead Code Report (2026-02-22)
+
+## Baseline Verification
+
+- `bun run build` -> PASS
+- `bun run test:fast` -> PASS
+
+## Discovery Commands
+
+- `tsc --noEmit --noUnusedLocals --noUnusedParameters`
+- `bunx ts-prune -p tsconfig.json`
+
+## Triage
+
+### Remove
+
+- `src/anki-connect.ts` - removed unused `url` instance field.
+- `src/anki-integration.ts` - removed unused wrappers: `poll`, `showProgressTick`, `refreshMiscInfoField`.
+- `src/anki-integration/card-creation.ts` - removed unused `MediaGenerator` import.
+- `src/anki-integration/ui-feedback.ts` - removed unused callback parameter in `withUpdateProgress`.
+- `src/core/services/anki-jimaku-ipc.ts` - removed unused `JimakuDownloadQuery` import.
+- `src/core/services/immersion-tracker-service.ts` - removed unused fields `lastMaintenanceMs`, `lastQueueWriteAtMs`; removed unused `runRollupMaintenance` wrapper.
+- `src/core/services/ipc-command.ts` - removed unused `RuntimeOptionValue` import.
+- `src/renderer/positioning/position-state.ts` - removed unused `ctx` parameter from `getPersistedOffset`.
+- `src/tokenizers/index.ts` - removed unused exported helpers `getRegisteredTokenizerProviderIds`, `createTokenizerProvider`.
+- `src/token-mergers/index.ts` - removed unused exported helpers `getRegisteredTokenMergerProviderIds`, `createTokenMergerProvider`.
+- `src/core/utils/index.ts` - removed unused barrel re-exports `asBoolean`, `asFiniteNumber`, `asString`.
+
+### Keep (intentional / out-of-scope)
+
+- `src/main/runtime/composers/composer-contracts.type-test.ts` private `_` type aliases remain; they are compile-time contract assertions.
+- `src/main.ts` large unused-import cluster from ongoing composer/runtime decomposition kept for separate focused task to avoid behavior risk.
+- Broad `ts-prune` type-export findings in `src/types.ts` and multiple domain modules kept; many are declaration-surface exports and module-local false positives.
+
+## Complexity Delta
+
+- Removed 13 confirmed dead declarations/imports/helpers.
+- Removed 4 unused exported entrypoints from provider registries/util barrel.
+- `tsc --noEmit --noUnusedLocals --noUnusedParameters` diagnostics reduced to `39` lines; remaining diagnostics are concentrated in `src/main.ts` plus intentional type-test aliases.
+
+## Regression Safety / Tests
+
+- `bun test src/anki-integration.test.ts src/core/services/mining.test.ts src/core/services/anki-jimaku-ipc.test.ts src/core/services/immersion-tracker-service.test.ts src/core/services/ipc.test.ts`
+  - partial pass; direct IPC test invocation hit Electron ESM test harness issue (`Export named 'ipcMain' not found`) unrelated to cleanup.
+- Required task gates:
+  - `bun run build` -> PASS
+  - `bun run test:core:src` -> PASS
+  - `bun run test:config:src` -> PASS
+  - `bun run check:file-budgets` -> PASS (warning mode, no strict hotspot violations)
+
+## Remaining Candidates
+
+- Continue with dedicated `src/main.ts` dead-import cleanup once runtime composer migration settles.
+- Revisit `ts-prune` findings with a declaration-aware filter to separate true dead exports from public API type surfaces.
diff --git a/docs/shortcuts.md b/docs/shortcuts.md
new file mode 100644
index 0000000..4ce1285
--- /dev/null
+++ b/docs/shortcuts.md
@@ -0,0 +1,133 @@
+# Keyboard Shortcuts
+
+All shortcuts are configurable in `config.jsonc` under `shortcuts` and `keybindings`. Set any shortcut to `null` to disable it.
+
+## Global Shortcuts
+
+These work system-wide regardless of which window has focus.
+
+| Shortcut      | Action                   | Configurable                             |
+| ------------- | ------------------------ | ---------------------------------------- |
+| `Alt+Shift+O` | Toggle visible overlay   | `shortcuts.toggleVisibleOverlayGlobal`   |
+| `Alt+Shift+I` | Toggle invisible overlay | `shortcuts.toggleInvisibleOverlayGlobal` |
+| `Alt+Shift+Y` | Open Yomitan settings    | Fixed (not configurable)                 |
+
+::: tip
+Global shortcuts are registered with the OS. If they conflict with another application, update them in `shortcuts` config and restart SubMiner.
+:::
+
+## Mining Shortcuts
+
+These work when the overlay window has focus.
+
+| Shortcut           | Action                                          | Config key                              |
+| ------------------ | ----------------------------------------------- | --------------------------------------- |
+| `Ctrl/Cmd+S`       | Mine current subtitle as sentence card          | `shortcuts.mineSentence`                |
+| `Ctrl/Cmd+Shift+S` | Mine multiple lines (press 1–9 to select count) | `shortcuts.mineSentenceMultiple`        |
+| `Ctrl/Cmd+C`       | Copy current subtitle text                      | `shortcuts.copySubtitle`                |
+| `Ctrl/Cmd+Shift+C` | Copy multiple lines (press 1–9 to select count) | `shortcuts.copySubtitleMultiple`        |
+| `Ctrl/Cmd+V`       | Update last Anki card from clipboard text       | `shortcuts.updateLastCardFromClipboard` |
+| `Ctrl/Cmd+G`       | Trigger field grouping (Kiku merge check)       | `shortcuts.triggerFieldGrouping`        |
+| `Ctrl/Cmd+Shift+A` | Mark last card as audio card                    | `shortcuts.markAudioCard`               |
+
+The multi-line shortcuts open a digit selector with a 3-second timeout (`shortcuts.multiCopyTimeoutMs`). Press `1`–`9` to select how many recent subtitle lines to combine.
+
+## Overlay Controls
+
+These control playback and subtitle display. They require overlay window focus.
+
+| Shortcut             | Action                                             |
+| -------------------- | -------------------------------------------------- |
+| `Space`              | Toggle mpv pause                                   |
+| `ArrowRight`         | Seek forward 5 seconds                             |
+| `ArrowLeft`          | Seek backward 5 seconds                            |
+| `ArrowUp`            | Seek forward 60 seconds                            |
+| `ArrowDown`          | Seek backward 60 seconds                           |
+| `Shift+H`            | Jump to previous subtitle                          |
+| `Shift+L`            | Jump to next subtitle                              |
+| `Ctrl+Shift+H`       | Replay current subtitle (play to end, then pause)  |
+| `Ctrl+Shift+L`       | Play next subtitle (jump, play to end, then pause) |
+| `Q`                  | Quit mpv                                           |
+| `Ctrl+W`             | Quit mpv                                           |
+| `Right-click`        | Toggle pause (outside subtitle area)               |
+| `Right-click + drag` | Reposition subtitles (on subtitle area)            |
+| `Ctrl/Cmd+A`         | Append clipboard video path to mpv playlist        |
+
+These keybindings can be overridden or disabled via the `keybindings` config array.
+
+## Subtitle & Feature Shortcuts
+
+| Shortcut           | Action                                                   | Config key                     |
+| ------------------ | -------------------------------------------------------- | ------------------------------ |
+| `Ctrl/Cmd+Shift+V` | Cycle secondary subtitle mode (hidden → visible → hover) | `shortcuts.toggleSecondarySub` |
+| `Ctrl/Cmd+Shift+O` | Open runtime options palette                             | `shortcuts.openRuntimeOptions` |
+| `Ctrl+Shift+J`     | Open Jimaku subtitle search modal                        | `shortcuts.openJimaku`         |
+| `Ctrl+Alt+S`       | Open subtitle sync (subsync) modal                       | `shortcuts.triggerSubsync`     |
+
+## Invisible Subtitle Position Edit Mode
+
+Enter edit mode to fine-tune invisible overlay alignment with mpv's native subtitles.
+
+| Shortcut              | Action                           |
+| --------------------- | -------------------------------- |
+| `Ctrl/Cmd+Shift+P`    | Toggle position edit mode        |
+| `ArrowKeys` or `hjkl` | Nudge position by 1 px           |
+| `Shift+Arrow`         | Nudge position by 4 px           |
+| `Enter` or `Ctrl+S`   | Save position and exit edit mode |
+| `Esc`                 | Cancel and discard changes       |
+
+## MPV Plugin Chords
+
+When the mpv plugin is installed, all commands use a `y` chord prefix — press `y`, then the second key within 1 second.
+
+| Chord | Action                                  |
+| ----- | --------------------------------------- |
+| `y-y` | Open SubMiner menu (OSD)                |
+| `y-s` | Start overlay                           |
+| `y-S` | Stop overlay                            |
+| `y-t` | Toggle visible overlay                  |
+| `y-i` | Toggle invisible overlay                |
+| `y-I` | Show invisible overlay                  |
+| `y-u` | Hide invisible overlay                  |
+| `y-o` | Open Yomitan settings                   |
+| `y-r` | Restart overlay                         |
+| `y-c` | Check overlay status                    |
+
+When the overlay has focus, press `y` then `d` to toggle DevTools (debugging helper).
+
+## Drag-and-Drop
+
+| Gesture                   | Action                                           |
+| ------------------------- | ------------------------------------------------ |
+| Drop file(s) onto overlay | Replace current mpv playlist with dropped files  |
+| `Shift` + drop file(s)    | Append all dropped files to current mpv playlist |
+
+## Customizing Shortcuts
+
+All `shortcuts.*` keys accept [Electron accelerator strings](https://www.electronjs.org/docs/latest/tutorial/keyboard-shortcuts), for example `"CommandOrControl+Shift+M"`. Use `null` to disable a shortcut.
+
+```jsonc
+{
+  "shortcuts": {
+    "mineSentence": "CommandOrControl+S",
+    "copySubtitle": "CommandOrControl+C",
+    "toggleVisibleOverlayGlobal": "Alt+Shift+O",
+    "toggleInvisibleOverlayGlobal": "Alt+Shift+I",
+    "openJimaku": null, // disabled
+  },
+}
+```
+
+The `keybindings` array overrides or extends the overlay's built-in key handling for mpv commands:
+
+```jsonc
+{
+  "keybindings": [
+    { "key": "f", "command": ["cycle", "fullscreen"] },
+    { "key": "m", "command": ["cycle", "mute"] },
+    { "key": "Space", "command": null }, // disable default Space → pause
+  ],
+}
+```
+
+Both `shortcuts` and `keybindings` are [hot-reloadable](/configuration#hot-reload-behavior) — changes take effect without restarting SubMiner.
diff --git a/docs/troubleshooting.md b/docs/troubleshooting.md
new file mode 100644
index 0000000..39ce9ca
--- /dev/null
+++ b/docs/troubleshooting.md
@@ -0,0 +1,202 @@
+# Troubleshooting
+
+Common issues and how to resolve them.
+
+## MPV Connection
+
+**Overlay starts but shows no subtitles**
+
+SubMiner connects to mpv via a Unix socket (or named pipe on Windows). If the socket does not exist or the path does not match, the overlay will appear but subtitles will never arrive.
+
+- Ensure mpv is running with `--input-ipc-server=/tmp/subminer-socket`.
+- If you use a custom socket path, set it in both your mpv config and SubMiner config (`mpvSocketPath`).
+- The `subminer` wrapper script sets the socket automatically when it launches mpv. If you launch mpv yourself, the `--input-ipc-server` flag is required.
+
+SubMiner retries the connection automatically with increasing delays (200 ms, 500 ms, 1 s, 2 s on first connect; 1 s, 2 s, 5 s, 10 s on reconnect). If mpv exits and restarts, the overlay reconnects without needing a restart.
+
+## Logging and App Mode
+
+- Default log output is `info`.
+- Use `--log-level` for more/less output.
+- Use `--dev`/`--debug` only to force app/dev mode (for example to get dev behavior from the overlay/app); they do not change log verbosity.
+- You can combine both, for example `SubMiner.AppImage --start --dev --log-level debug`, when you need maximum diagnostics.
+
+**"Failed to parse MPV message"**
+
+Logged when a malformed JSON line arrives from the mpv socket. Usually harmless — SubMiner skips the bad line and continues. If it happens constantly, check that nothing else is writing to the same socket path.
+
+## AnkiConnect
+
+**"AnkiConnect: unable to connect"**
+
+SubMiner polls AnkiConnect at `http://127.0.0.1:8765` (configurable via `ankiConnect.url`). This error means Anki is not running or the AnkiConnect add-on is not installed.
+
+- Install the [AnkiConnect](https://ankiweb.net/shared/info/2055492159) add-on in Anki.
+- Make sure Anki is running before you start mining.
+- If you changed the AnkiConnect port, update `ankiConnect.url` in your config.
+
+SubMiner retries with exponential backoff (up to 5 s) and suppresses repeated error logs after 5 consecutive failures. When Anki comes back, you will see "AnkiConnect connection restored".
+
+**Cards are created but fields are empty**
+
+Field names in your config must match your Anki note type exactly (case-sensitive). Check `ankiConnect.fields` — for example, if your note type uses `SentenceAudio` but your config says `Audio`, the field will not be populated.
+
+See [Anki Integration](/anki-integration) for the full field mapping reference.
+
+**"Update failed" OSD message**
+
+Shown when SubMiner tries to update a card that no longer exists, or when AnkiConnect rejects the update. Common causes:
+
+- The card was deleted in Anki between polling and update.
+- The note type changed and a mapped field no longer exists.
+
+## Overlay
+
+**Overlay does not appear**
+
+- Confirm SubMiner is running: `SubMiner.AppImage --start` or check for the process.
+- On Linux, the overlay requires a compositor. Hyprland and Sway are supported natively; X11 requires `xdotool` and `xwininfo`.
+- On macOS, grant Accessibility permission to SubMiner in System Settings > Privacy & Security > Accessibility.
+
+**Overlay appears but clicks pass through / cannot interact**
+
+- On Linux, mouse passthrough can be unreliable — this is a known Electron/platform limitation. The overlay keeps pointer events enabled by default on Linux.
+- On macOS/Windows, `setIgnoreMouseEvents` toggles automatically. If clicks stop working, toggle the overlay off and back on (`Alt+Shift+O`).
+- Make sure you are hovering over the subtitle area — the overlay only becomes interactive when the cursor is over subtitle text.
+
+**Overlay briefly freezes after a modal/runtime error**
+
+- Renderer errors now trigger an automatic recovery path. You should see a short toast ("Renderer error recovered. Overlay is still running.").
+- Recovery closes any open modal and restores click-through/shortcuts automatically without interrupting mpv playback.
+- If errors keep recurring, toggle the overlay's DevTools using overlay chord `y` then `d` (or global `F12`) and inspect the `renderer overlay recovery` error payload for stack trace + modal/subtitle context.
+
+**Overlay is on the wrong monitor or position**
+
+SubMiner positions the overlay by tracking the mpv window. If tracking fails:
+
+- Hyprland: Ensure `hyprctl` is available.
+- Sway: Ensure `swaymsg` is available.
+- X11: Ensure `xdotool` and `xwininfo` are installed.
+
+If the overlay position is slightly off, use invisible subtitle position edit mode (`Ctrl/Cmd+Shift+P`) to fine-tune the offset with arrow keys, then save with `Enter` or `Ctrl+S`.
+
+## Yomitan
+
+**"Yomitan extension not found in any search path"**
+
+SubMiner bundles Yomitan and searches for it in these locations (in order):
+
+1. `vendor/yomitan` (relative to executable)
+2. `<resources>/yomitan` (Electron resources path)
+3. `/usr/share/SubMiner/yomitan`
+4. `~/.config/SubMiner/extensions/yomitan`
+
+If you installed from the AppImage and see this error, the package may be incomplete. Re-download the AppImage or place the Yomitan extension manually in `~/.config/SubMiner/extensions/yomitan`.
+
+**Yomitan popup does not appear when clicking words**
+
+- Verify Yomitan loaded successfully — check the terminal output for "Loaded Yomitan extension".
+- Yomitan requires dictionaries to be installed. Open Yomitan settings (`Alt+Shift+Y` or `SubMiner.AppImage --settings`) and confirm at least one dictionary is imported.
+- If the overlay shows subtitles but words are not clickable, the tokenizer may have failed. See the MeCab section below.
+
+## MeCab / Tokenization
+
+**"MeCab not found on system"**
+
+This is informational, not an error. SubMiner tokenization is driven by Yomitan's internal parser. MeCab availability checks may still run for auxiliary token metadata, but MeCab is not used as a tokenization fallback path.
+
+To install MeCab:
+
+- **Arch Linux**: `sudo pacman -S mecab mecab-ipadic`
+- **Ubuntu/Debian**: `sudo apt install mecab libmecab-dev mecab-ipadic-utf8`
+- **macOS**: `brew install mecab mecab-ipadic`
+
+**Words are not segmented correctly**
+
+Japanese word boundaries depend on Yomitan parser output. If segmentation seems wrong:
+
+- Verify Yomitan dictionaries are installed and active.
+- Note that CJK characters without spaces are segmented using parser heuristics, which is not always perfect.
+
+## Media Generation
+
+**"FFmpeg not found"**
+
+SubMiner uses FFmpeg to extract audio clips and generate screenshots. Install it:
+
+- **Arch Linux**: `sudo pacman -S ffmpeg`
+- **Ubuntu/Debian**: `sudo apt install ffmpeg`
+- **macOS**: `brew install ffmpeg`
+
+Without FFmpeg, card creation still works but audio and image fields will be empty.
+
+**Audio or screenshot generation hangs**
+
+Media generation has a 30-second timeout (60 seconds for animated AVIF). If your video file is on a slow network mount or the codec requires software decoding, generation may time out. Try:
+
+- Using a local copy of the video file.
+- Reducing `media.imageQuality` or switching from `avif` to `static` image type.
+- Checking that `media.maxMediaDuration` is not set too high.
+
+## Shortcuts
+
+**"Failed to register global shortcut"**
+
+Global shortcuts (`Alt+Shift+O`, `Alt+Shift+I`, `Alt+Shift+Y`) may conflict with other applications or desktop environment keybindings.
+
+- Check your DE/WM keybinding settings for conflicts.
+- Change the shortcuts in your config under `shortcuts.toggleVisibleOverlayGlobal`, `shortcuts.toggleInvisibleOverlayGlobal`.
+- On Wayland, global shortcut registration has limitations depending on the compositor.
+
+**Overlay keybindings not working**
+
+Overlay-local shortcuts (Space, arrow keys, etc.) only work when the overlay window has focus. Click on the overlay or use the global shortcut to toggle it to give it focus.
+
+## Subtitle Timing
+
+**"Subtitle timing not found; copy again while playing"**
+
+This OSD message appears when you try to mine a sentence but SubMiner has no timing data for the current subtitle. Causes:
+
+- The video is paused and no subtitle has been received yet.
+- The subtitle track changed and timing data was cleared.
+- You are using an external subtitle file that mpv has not fully loaded.
+
+Resume playback and wait for the next subtitle to appear, then try mining again.
+
+## Subtitle Sync (Subsync)
+
+**"Configured alass executable not found"**
+
+Install alass or configure the path:
+
+- **Arch Linux (AUR)**: `yay -S alass-git`
+- Set the path: `subsync.alass_path` in your config.
+
+**"Subtitle synchronization failed"**
+
+SubMiner tries alass first, then falls back to ffsubsync. If both fail:
+
+- Ensure the reference subtitle track exists in the video (alass requires a source track).
+- Check that `ffmpeg` is available (used to extract the internal subtitle track).
+- Try running the sync tool manually to see detailed error output.
+
+## Jimaku
+
+**"Jimaku request failed" or HTTP 429**
+
+The Jimaku API has rate limits. If you see 429 errors, wait for the retry duration shown in the OSD message and try again. If you have a Jimaku API key, set it in `jimaku.apiKey` or `jimaku.apiKeyCommand` to get higher rate limits.
+
+## Platform-Specific
+
+### Linux
+
+- **Wayland (Hyprland/Sway)**: Window tracking uses compositor-specific commands. If `hyprctl` or `swaymsg` are not on `PATH`, tracking will fail silently.
+- **X11**: Requires `xdotool` and `xwininfo`. If missing, the overlay cannot track the mpv window position.
+- **Mouse passthrough**: On Linux, Electron's mouse passthrough is unreliable. SubMiner keeps pointer events enabled, meaning you may need to toggle the overlay off to interact with mpv controls underneath.
+
+### macOS
+
+- **Accessibility permission**: Required for window tracking. Grant it in System Settings > Privacy & Security > Accessibility.
+- **Font rendering**: macOS uses a 0.87x font compensation factor for subtitle alignment between mpv and the overlay. If text alignment looks off, adjust the invisible subtitle offset.
+- **Gatekeeper**: If macOS blocks SubMiner, right-click the app and select "Open" to bypass the warning, or remove the quarantine attribute: `xattr -d com.apple.quarantine /path/to/SubMiner.app`
diff --git a/docs/usage.md b/docs/usage.md
new file mode 100644
index 0000000..38de2e1
--- /dev/null
+++ b/docs/usage.md
@@ -0,0 +1,215 @@
+# Usage
+
+There are two ways to use SubMiner — the `subminer` wrapper script or the mpv plugin:
+
+| Approach            | Best For                                                                                                                                                                                                       |
+| ------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
+| **subminer script** | All-in-one solution. Handles video selection, launches MPV with the correct socket, and manages app commands. Overlay start is explicit (`--start`, `-S`, or `y-s`).                                           |
+| **MPV plugin**      | When you launch MPV yourself or from other tools. Provides in-MPV chord keybindings (e.g. `y-y` for menu) to control visible and invisible overlay layers. Requires `--input-ipc-server=/tmp/subminer-socket`. |
+
+You can use both together—install the plugin for on-demand control, but use `subminer` when you want the streamlined workflow.
+
+`subminer` is implemented as a Bun script and runs directly via shebang (no `bun run` needed), for example: `subminer --start video.mkv`.
+
+## Live Config Reload
+
+While SubMiner is running, it watches your active config file and applies safe updates automatically.
+
+Live-updated settings:
+
+- `subtitleStyle`
+- `keybindings`
+- `shortcuts`
+- `secondarySub.defaultMode`
+- `ankiConnect.ai`
+
+Invalid config edits are rejected; SubMiner keeps the previous valid runtime config and shows an error notification.
+For restart-required sections, SubMiner shows a restart-needed notification.
+
+## Commands
+
+```bash
+# Browse and play videos
+subminer                          # Current directory (uses fzf)
+subminer -R                       # Use rofi instead of fzf
+subminer -d ~/Videos              # Specific directory
+subminer -r -d ~/Anime            # Recursive search
+subminer video.mkv                # Play specific file
+subminer --start video.mkv        # Play + explicitly start overlay
+subminer https://youtu.be/...     # Play a YouTube URL
+subminer ytsearch:"jp news"       # Play first YouTube search result
+subminer --log-level debug video.mkv # Enable verbose logs for launch/debugging
+subminer --log-level warn video.mkv  # Set logging level explicitly
+
+# Options
+subminer -T video.mkv             # Disable texthooker server
+subminer -b x11 video.mkv         # Force X11 backend
+subminer video.mkv                # Uses mpv profile "subminer" by default
+subminer -p gpu-hq video.mkv      # Override mpv profile
+subminer jellyfin                 # Open Jellyfin setup window (subcommand form)
+subminer jellyfin -l --server http://127.0.0.1:8096 --username me --password 'secret'
+subminer jellyfin --logout        # Clear stored Jellyfin token/session data
+subminer jellyfin -p              # Interactive Jellyfin library/item picker + playback
+subminer jellyfin -d              # Jellyfin cast-discovery mode (foreground app)
+subminer doctor                   # Dependency + config + socket diagnostics
+subminer config path              # Print active config path
+subminer config show              # Print active config contents
+subminer mpv socket               # Print active mpv socket path
+subminer mpv status               # Exit 0 if socket is ready, else exit 1
+subminer mpv idle                 # Launch detached idle mpv with SubMiner defaults
+subminer texthooker               # Launch texthooker-only mode
+subminer app --anilist            # Pass args directly to SubMiner binary (example: AniList login flow)
+subminer yt -o ~/subs https://youtu.be/...  # YouTube subcommand: output directory shortcut
+subminer yt --mode preprocess --whisper-bin /path/to/whisper-cli --whisper-model /path/to/model.bin https://youtu.be/...  # Pre-generate subtitle tracks before playback
+
+# Direct AppImage control
+SubMiner.AppImage --background             # Start in background (tray + IPC wait, minimal logs)
+SubMiner.AppImage --start --texthooker   # Start overlay with texthooker
+SubMiner.AppImage --texthooker           # Launch texthooker only (no overlay window)
+SubMiner.AppImage --stop                  # Stop overlay
+SubMiner.AppImage --start --toggle        # Start MPV IPC + toggle visibility
+SubMiner.AppImage --start --toggle-invisible-overlay  # Start MPV IPC + toggle invisible layer
+SubMiner.AppImage --show-visible-overlay              # Force show visible overlay
+SubMiner.AppImage --hide-visible-overlay              # Force hide visible overlay
+SubMiner.AppImage --show-invisible-overlay            # Force show invisible overlay
+SubMiner.AppImage --hide-invisible-overlay            # Force hide invisible overlay
+SubMiner.AppImage --start --dev                         # Enable app/dev mode only
+SubMiner.AppImage --start --debug                       # Alias for --dev
+SubMiner.AppImage --start --log-level debug             # Force verbose logging without app/dev mode
+SubMiner.AppImage --settings              # Open Yomitan settings
+SubMiner.AppImage --jellyfin              # Open Jellyfin setup window
+SubMiner.AppImage --jellyfin-login --jellyfin-server http://127.0.0.1:8096 --jellyfin-username me --jellyfin-password 'secret'
+SubMiner.AppImage --jellyfin-logout       # Clear stored Jellyfin token/session data
+SubMiner.AppImage --jellyfin-libraries
+SubMiner.AppImage --jellyfin-items --jellyfin-library-id LIBRARY_ID --jellyfin-search anime --jellyfin-limit 20
+SubMiner.AppImage --jellyfin-play --jellyfin-item-id ITEM_ID --jellyfin-audio-stream-index 1 --jellyfin-subtitle-stream-index 2  # Requires connected mpv IPC (--start or plugin workflow)
+SubMiner.AppImage --jellyfin-remote-announce  # Force cast-target capability announce + visibility check
+SubMiner.AppImage --help                  # Show all options
+```
+
+### Logging and App Mode
+
+- `--log-level` controls logger verbosity.
+- `--dev` and `--debug` are app/dev-mode switches; they are not log-level aliases.
+- `--background` defaults to quieter logging (`warn`) unless `--log-level` is set.
+- `--background` launched from a terminal detaches and returns the prompt; stop it with tray Quit or `SubMiner.AppImage --stop`.
+- Linux desktop launcher starts SubMiner with `--background` by default (via electron-builder `linux.executableArgs`).
+- Use both when needed, for example `SubMiner.AppImage --start --dev --log-level debug`.
+
+### Launcher Subcommands
+
+- `subminer jellyfin` / `subminer jf`: Jellyfin-focused workflow aliases.
+- `subminer yt` / `subminer youtube`: YouTube-focused shorthand flags (`-o`, `-m`).
+- `subminer doctor`: health checks for core dependencies and runtime paths.
+- `subminer config`: config helpers (`path`, `show`).
+- `subminer mpv`: mpv helpers (`status`, `socket`, `idle`).
+- `subminer texthooker`: texthooker-only shortcut (same behavior as `--texthooker`).
+- `subminer app` / `subminer bin`: direct passthrough to the SubMiner binary/AppImage.
+- Subcommand help pages are available (for example `subminer jellyfin -h`, `subminer yt -h`).
+
+Use subcommands for Jellyfin/YouTube command families (`subminer jellyfin ...`, `subminer yt ...`).
+Top-level launcher flags like `--jellyfin-*` and `--yt-subgen-*` are intentionally rejected.
+
+### MPV Profile Example (mpv.conf)
+
+`subminer` passes the following MPV options directly on launch by default:
+
+- `--input-ipc-server=/tmp/subminer-socket` (or your configured socket path)
+- `--alang=ja,jp,jpn,japanese,en,eng,english,enus,en-us`
+- `--slang=ja,jp,jpn,japanese,en,eng,english,enus,en-us`
+- `--sub-auto=fuzzy`
+- `--sub-file-paths=.;subs;subtitles`
+- `--sid=auto`
+- `--secondary-sid=auto`
+- `--secondary-sub-visibility=no`
+
+You can define a matching profile in `~/.config/mpv/mpv.conf` for consistency when launching `mpv` manually or from other tools. `subminer` launches with `--profile=subminer` by default (or override with `subminer -p <profile> ...`):
+
+```ini
+[subminer]
+# IPC socket (must match SubMiner config)
+input-ipc-server=/tmp/subminer-socket
+
+# Prefer JP/EN audio + subtitle language variants
+alang=ja,jp,jpn,japanese,en,eng,english,enus,en-us
+slang=ja,jp,jpn,japanese,en,eng,english,enus,en-us
+
+# Auto-load external subtitles
+sub-auto=fuzzy
+sub-file-paths=.;subs;subtitles
+
+# Select primary + secondary subtitle tracks automatically
+sid=auto
+secondary-sid=auto
+secondary-sub-visibility=no
+```
+
+`secondary-slang` is not an mpv option; use `slang` with `sid=auto` / `secondary-sid=auto` instead.
+
+### YouTube Playback
+
+`subminer` accepts direct URLs (for example, YouTube links) and `ytsearch:` targets, and forwards them to mpv.
+
+Notes:
+
+- Install `yt-dlp` so mpv can resolve YouTube streams and subtitle tracks reliably.
+- `subminer` supports three subtitle-generation modes for YouTube URLs:
+  - `automatic` (default): starts playback immediately, generates subtitles in the background, and loads them into mpv when ready.
+  - `preprocess`: generates subtitles first, then starts playback with generated `.srt` files attached.
+  - `off`: disables launcher generation and leaves subtitle handling to mpv/yt-dlp.
+- Primary subtitle target languages come from `youtubeSubgen.primarySubLanguages` (defaults to `["ja","jpn"]`).
+- Secondary target languages come from `secondarySub.secondarySubLanguages` (defaults to English if unset).
+- `subminer` prefers subtitle tracks from yt-dlp first, then falls back to local `whisper.cpp` (`whisper-cli`) when tracks are missing.
+- Whisper translation fallback currently only supports English secondary targets; non-English secondary targets rely on yt-dlp subtitle availability.
+- Configure defaults in `$XDG_CONFIG_HOME/SubMiner/config.jsonc` (or `~/.config/SubMiner/config.jsonc`) under `youtubeSubgen` and `secondarySub`, or override mode/tool paths via CLI flags/environment variables.
+
+## Keybindings
+
+### Global Shortcuts
+
+| Keybind       | Action                   |
+| ------------- | ------------------------ |
+| `Alt+Shift+O` | Toggle visible overlay   |
+| `Alt+Shift+I` | Toggle invisible overlay |
+| `Alt+Shift+Y` | Open Yomitan settings    |
+
+`Alt+Shift+Y` is a fixed global shortcut; it is not part of `shortcuts` config.
+
+### Overlay Controls (Configurable)
+
+| Input                | Action                                             |
+| -------------------- | -------------------------------------------------- |
+| `Space`              | Toggle MPV pause                                   |
+| `ArrowRight`         | Seek forward 5 seconds                             |
+| `ArrowLeft`          | Seek backward 5 seconds                            |
+| `ArrowUp`            | Seek forward 60 seconds                            |
+| `ArrowDown`          | Seek backward 60 seconds                           |
+| `Shift+H`            | Jump to previous subtitle                          |
+| `Shift+L`            | Jump to next subtitle                              |
+| `Ctrl+Shift+H`       | Replay current subtitle (play to end, then pause)  |
+| `Ctrl+Shift+L`       | Play next subtitle (jump, play to end, then pause) |
+| `Q`                  | Quit mpv                                           |
+| `Ctrl+W`             | Quit mpv                                           |
+| `Right-click`        | Toggle MPV pause (outside subtitle area)           |
+| `Right-click + drag` | Move subtitle position (on subtitle)               |
+| `Ctrl/Cmd+Shift+P`   | Toggle invisible subtitle position edit mode       |
+| `Arrow keys`         | Move invisible subtitles while edit mode is active |
+| `Enter` / `Ctrl+S`   | Save invisible subtitle position in edit mode      |
+| `Esc`                | Cancel invisible subtitle position edit mode       |
+| `Ctrl/Cmd+A`         | Append clipboard video path to MPV playlist        |
+
+These keybindings only work when the overlay window has focus. See [Configuration](/configuration) for customization.
+
+### Drag-and-drop Queueing
+
+- Drag and drop one or more video files onto the overlay to replace current playback (`loadfile ... replace` for first file, then append remainder).
+- Hold `Shift` while dropping to append all dropped files to the current MPV playlist.
+
+## How It Works
+
+1. MPV runs with an IPC socket at `/tmp/subminer-socket`
+2. The overlay connects and subscribes to subtitle changes
+3. Subtitles are tokenized with Yomitan's internal parser
+4. Words are displayed as clickable spans
+5. Clicking a word triggers Yomitan popup for dictionary lookup
+6. Texthooker server runs at `http://127.0.0.1:5174` for external tools