feat(anime): add anime browser powered by Aniyomi extensions

- Add `subminer anime` / `--anime` and a tray entry to open a browser that searches installed Aniyomi extension sources, shows cover art and episodes, and plays into mpv with overlay/mining attached
- Add an Extensions tab to add repos and install/update/remove sources, and per-source settings for sources needing config
- Support searching all sources at once with streaming, per-source results and status
- Prefer Japanese audio/subtitle tracks from the source and keep the primary subtitle slot reserved for Japanese
- Fix window/tray/Dock handling so the browser and mpv can be switched between without quitting the app or losing the Dock icon
- Add anime.repos, anime.extensionsDir, anime.preferredQuality config keys (no bundled repos or discovery)

docs-site/aniskip-integration.md

@@ -45,9 +45,9 @@ Results are cached per file for the app session; only definitive "no intro found
 
 You can trigger AniSkip actions from mpv script-messages:
 
-| Command | Effect |
-| ------- | ------ |
-| `script-message subminer-skip-intro` | Skip to the intro end immediately (same as pressing the key) |
+| Command                                   | Effect                                                                  |
+| ----------------------------------------- | ----------------------------------------------------------------------- |
+| `script-message subminer-skip-intro`      | Skip to the intro end immediately (same as pressing the key)            |
 | `script-message subminer-aniskip-refresh` | Force a fresh lookup for the current file, discarding any cached result |
 
 These are handled by the SubMiner app over the IPC socket.