feat(stats): add sentence search tab and fix mining card behavior

- Add Search tab with realtime subtitle sentence search, media context, and mining actions
- Persist library card size selection across reloads
- Fix selection text written only for sentence cards, not word/audio cards
- Fix word mining audio routed to SentenceAudio field when present
- Fix sentence card created immediately before slow media generation completes
- Fix Anki config resolved at request time for sentence mining
- Prefer non-Signs/Songs tracks when auto-selecting secondary subtitle language

docs-site/immersion-tracking.md

@@ -18,8 +18,8 @@ Episode completion for local `watched` state uses the shared `DEFAULT_MIN_WATCH_
 {
   "immersionTracking": {
     "enabled": true,
-    "dbPath": ""
-  }
+    "dbPath": "",
+  },
 }
 ```
 
@@ -70,6 +70,10 @@ Top repeated words (click a bar to open the word), new-word timeline, frequency
 
 ![Stats Vocabulary](/screenshots/stats-vocabulary.png)
 
+#### Search
+
+Realtime search across tracked primary subtitle lines and media titles. Results show the source media, session, line number, timing, and sentence text. Secondary subtitle text is not shown or searched here because separate subtitle tracks may not line up sentence-for-sentence. Sentence cards can be mined from any result with a valid local source and timing. Word and audio card buttons appear only when the searched word exactly appears in the primary sentence text; matching text is highlighted in the result.
+
 Stats server config lives under `stats`:
 
 ```jsonc
@@ -78,8 +82,8 @@ Stats server config lives under `stats`:
     "toggleKey": "Backquote",
     "serverPort": 6969,
     "autoStartServer": true,
-    "autoOpenBrowser": false
-  }
+    "autoOpenBrowser": false,
+  },
 }
 ```
 
@@ -96,15 +100,15 @@ Stats server config lives under `stats`:
 
 ## Mining Cards from the Stats Page
 
-The Vocabulary tab's word detail panel shows example lines from your viewing history. Each example line with a valid source file offers three mining buttons:
+The Search tab and the Vocabulary tab's word detail panel both mine from subtitle lines in your viewing history. Each line with a valid source file offers sentence-card mining; word/audio mining is available when the selected word or searched word appears in the sentence:
 
 - **Mine Word** - performs a full Yomitan dictionary lookup for the word (definition, reading, pitch accent, etc.) via a short-lived hidden helper, then enriches the card with sentence audio, a screenshot or animated AVIF clip, the highlighted sentence, and metadata extracted from the source video file. Requires Anki and Yomitan dictionaries to be loaded.
-- **Mine Sentence** - creates a sentence card directly with the `IsSentenceCard` flag set (for Lapis/Kiku workflows), along with audio, image, and translation from the secondary subtitle if available.
+- **Mine Sentence** - creates a sentence card directly with the `IsSentenceCard` flag set (for Lapis/Kiku workflows), along with audio and image from the source video.
 - **Mine Audio** - creates an audio-only card with the `IsAudioCard` flag, attaching only the sentence audio clip.
 
 All three modes respect your `ankiConnect` config: deck, model, field mappings, media settings (static vs AVIF, quality, dimensions), audio padding, metadata pattern, and tags. Media generation runs in parallel for faster card creation.
 
-Secondary subtitle text (typically English translations) is stored alongside primary subtitles during playback and used as the translation field when mining from the stats page.
+Secondary subtitle text (typically English translations) is stored alongside primary subtitles during playback and can be used as the translation field when mining sentence cards from Search or vocabulary occurrences. The Search tab does not use that text for display or matching.
 
 ### Word Exclusion List
 
@@ -114,12 +118,12 @@ The Vocabulary tab toolbar includes an **Exclusions** button for hiding words fr
 
 By default, SubMiner keeps all retention tables and raw data (`0` means keep all) while continuing daily/monthly rollup maintenance:
 
-| Data type      | Retention |
-| -------------- | --------- |
-| Raw events     | 0 (keep all)   |
-| Telemetry      | 0 (keep all)   |
-| Sessions      | 0 (keep all)   |
-| Daily rollups  | 0 (keep all)   |
+| Data type       | Retention    |
+| --------------- | ------------ |
+| Raw events      | 0 (keep all) |
+| Telemetry       | 0 (keep all) |
+| Sessions        | 0 (keep all) |
+| Daily rollups   | 0 (keep all) |
 | Monthly rollups | 0 (keep all) |
 
 Maintenance runs on startup and every 24 hours. Vacuum runs only when `retention.vacuumIntervalDays` is non-zero.
@@ -146,24 +150,24 @@ The tracker is optimized for "keep everything" defaults:
 
 All policy options live under `immersionTracking` in your config:
 
-| Option | Description |
-| ------ | ----------- |
-| `batchSize` | Writes per flush batch |
-| `flushIntervalMs` | Max delay between flushes (default: 500ms) |
-| `queueCap` | Max queued writes before oldest are dropped |
-| `payloadCapBytes` | Max payload size per write |
-| `maintenanceIntervalMs` | How often maintenance runs |
-| `retention.eventsDays` | Raw event retention |
-| `retention.telemetryDays` | Telemetry retention |
-| `retention.sessionsDays` | Session retention |
-| `retention.dailyRollupsDays` | Daily rollup retention |
-| `retention.monthlyRollupsDays` | Monthly rollup retention |
-| `retention.vacuumIntervalDays` | Minimum spacing between vacuums |
-| `retentionMode` | `preset` or `advanced` |
-| `retentionPreset` | `minimal`, `balanced`, or `deep-history` (used by `retentionMode`) |
-| `lifetimeSummaries.global` | Maintain global lifetime totals |
-| `lifetimeSummaries.anime` | Maintain per-anime lifetime totals |
-| `lifetimeSummaries.media` | Maintain per-media lifetime totals |
+| Option                         | Description                                                        |
+| ------------------------------ | ------------------------------------------------------------------ |
+| `batchSize`                    | Writes per flush batch                                             |
+| `flushIntervalMs`              | Max delay between flushes (default: 500ms)                         |
+| `queueCap`                     | Max queued writes before oldest are dropped                        |
+| `payloadCapBytes`              | Max payload size per write                                         |
+| `maintenanceIntervalMs`        | How often maintenance runs                                         |
+| `retention.eventsDays`         | Raw event retention                                                |
+| `retention.telemetryDays`      | Telemetry retention                                                |
+| `retention.sessionsDays`       | Session retention                                                  |
+| `retention.dailyRollupsDays`   | Daily rollup retention                                             |
+| `retention.monthlyRollupsDays` | Monthly rollup retention                                           |
+| `retention.vacuumIntervalDays` | Minimum spacing between vacuums                                    |
+| `retentionMode`                | `preset` or `advanced`                                             |
+| `retentionPreset`              | `minimal`, `balanced`, or `deep-history` (used by `retentionMode`) |
+| `lifetimeSummaries.global`     | Maintain global lifetime totals                                    |
+| `lifetimeSummaries.anime`      | Maintain per-anime lifetime totals                                 |
+| `lifetimeSummaries.media`      | Maintain per-media lifetime totals                                 |
 
 ## Query Templates