feat(overlay): add optional subtitle selection modal

- Add primary and secondary mpv track selection from the overlay
- Support configurable sequence shortcuts with conflict detection and hot reload
- Document settings, shortcuts, and generated config defaults

docs-site/configuration.md

@@ -1117,6 +1117,14 @@ When the manual merge popup opens, SubMiner pauses playback and closes any open
 
 <a :href="withBase('/assets/kiku-integration.webm')" target="_blank" rel="noreferrer">Open demo in a new tab</a>
 
+## Subtitle Selection
+
+Enable **Settings → Behavior → Subtitle Selection → Enabled** to choose mpv's primary and secondary subtitle tracks from a SubMiner modal. The feature is disabled by default. The dialog uses the same overlay focus and subtitle suppression behavior as the other modals.
+
+Press `g` then `s` to open it. Both selectors include **None**. Choose different tracks and click **Apply** to load them into mpv, or close the dialog to keep the current selection. Embedded and already-loaded external subtitle tracks are listed with their title, language, and codec when available.
+
+`subtitleSelection.enabled` controls the feature. `shortcuts.openSubtitleSelection` changes its shortcut, or accepts `null` to unbind it. Enabling the feature overrides mpv's binding for that shortcut when its first key is free; disabling it restores mpv's binding. Existing single-key actions take priority over sequences; see [shortcut conflicts](/shortcuts). Both settings apply immediately. See the [generated configuration example](/config.example.jsonc) for defaults.
+
 ## External integrations
 
 ### Jimaku

docs-site/public/config.example.jsonc

@@ -6,6 +6,15 @@
  */
 {
 
+  // ==========================================
+  // Subtitle Selection
+  // Select primary and secondary mpv subtitle tracks from the overlay.
+  // Hot-reload: enabling or disabling updates the session shortcut immediately.
+  // ==========================================
+  "subtitleSelection": {
+    "enabled": false // Use the SubMiner modal to select primary and secondary subtitle tracks. When enabled, its shortcut overrides mpv subtitle selection. Values: true | false
+  }, // Select primary and secondary mpv subtitle tracks from the overlay.
+
   // ==========================================
   // Japanese Subtitle Generation
   // Generate timed Japanese subtitles from local audio using whisper.cpp.
@@ -223,6 +232,7 @@
     "openRuntimeOptions": "CommandOrControl+Shift+O", // Accelerator that opens the runtime options modal.
     "openJimaku": "Ctrl+Shift+J", // Accelerator that opens the Jimaku subtitle search modal.
     "openTsukihime": "Ctrl+Shift+T", // Accelerator that opens the TsukiHime subtitle search modal (configured secondary/Japanese primary tabs).
+    "openSubtitleSelection": "g-s", // Open subtitle selection when enabled. Use g-s to press g then s. Set null to unbind.
     "openSubtitleGeneration": "Ctrl+Shift+G", // Accelerator that opens the standalone Japanese subtitle generation modal.
     "openSessionHelp": "CommandOrControl+Slash", // Accelerator that opens the session help / keybinding cheatsheet.
     "openControllerSelect": "Alt+C", // Accelerator that opens the controller selection and learn-mode modal.

docs-site/shortcuts.md

@@ -88,6 +88,7 @@ Mouse-hover playback behavior is configured separately from shortcuts: `subtitle
 | `Ctrl+Shift+T`     | Open TsukiHime subtitle search modal (EN/JA tabs)       | `shortcuts.openTsukihime`                 |
 | `Ctrl/Cmd+N`       | Toggle overlay notification history panel                | `shortcuts.toggleNotificationHistory`      |
 | `Ctrl+Alt+C`       | Open the manual YouTube subtitle picker                  | `keybindings`                              |
+| `g` then `s`       | Select primary and secondary subtitles, when enabled     | `shortcuts.openSubtitleSelection`                                                               |
 | `Ctrl+Alt+S`       | Open subtitle sync (subsync) modal                       | `shortcuts.triggerSubsync`                 |
 | `Ctrl/Cmd+A`       | Append clipboard video path to mpv playlist              | `shortcuts.appendClipboardVideoToQueue`    |
 | `\`                | Toggle subtitle sidebar                                  | `subtitleSidebar.toggleKey` (overlay) / `shortcuts.toggleSubtitleSidebar` (mpv session binding) |
@@ -98,6 +99,8 @@ Mouse-hover playback behavior is configured separately from shortcuts: `subtitle
 
 The stats toggle is handled inside the focused visible overlay window. It is configurable through the top-level `stats.toggleKey` setting and defaults to `Backquote`.
 
+Enable the subtitle selector in **Settings → Behavior → Subtitle Selection**. Its shortcut overrides mpv subtitle selection only while enabled. In the focused overlay, press the second key within one second. Single-key bindings take priority: if `g` already has an action in SubMiner or mpv, `g-s` is disabled with a conflict warning, and `g` still runs immediately. Remap the sequence or remove the conflicting single-key binding. The existing `y` prefix is reserved for its built-in commands. mpv bindings are checked on connection, configuration changes, and overlay focus; refresh the overlay after changing another script's bindings. See [subtitle selection](/configuration#subtitle-selection).
+
 The subtitle sidebar toggle is overlay-local and only opens when SubMiner has a parsed cue list for the active subtitle source.
 
 In the sidebar, `Enter` seeks the keyboard-focused cue. `Space` keeps its configured playback action, normally pause/resume, even when a cue has focus.