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)

src/main/runtime/composers/jellyfin-runtime-composer.ts

@@ -130,6 +130,9 @@ export type JellyfinRuntimeComposerOptions = ComposerInputs<{
 export type JellyfinRuntimeComposerResult = ComposerOutputs<{
   getResolvedJellyfinConfig: ReturnType<typeof createGetResolvedJellyfinConfigHandler>;
   getJellyfinClientInfo: ReturnType<typeof createGetJellyfinClientInfoHandler>;
+  ensureMpvConnectedForPlayback: ReturnType<
+    typeof createEnsureMpvConnectedForJellyfinPlaybackHandler
+  >;
   reportJellyfinRemoteProgress: ReturnType<
     typeof composeJellyfinRemoteHandlers
   >['reportJellyfinRemoteProgress'];
@@ -297,6 +300,9 @@ export function composeJellyfinRuntimeHandlers(
   return {
     getResolvedJellyfinConfig,
     getJellyfinClientInfo,
+    // Shared so other playback sources (the anime browser) reuse the same
+    // auto-launch in-flight guard instead of racing a second mpv launch.
+    ensureMpvConnectedForPlayback: ensureMpvConnectedForJellyfinPlayback,
     reportJellyfinRemoteProgress,
     reportJellyfinRemoteStopped,
     handleJellyfinRemotePlay,