fix(jellyfin): show overlay, inject plugin, and fix stats title on playb

- Show visible overlay automatically during Jellyfin playback so subtitleStyle applies
- Inject bundled mpv plugin on auto-launch so keybindings work without overlay focus
- Group Jellyfin playback stats under item metadata (jellyfin://host/item/id) instead of stream URLs so episodes merge with matching local titles
- Mark ffsubsync unavailable in subsync modal for remote media paths
- Drain queued second-instance commands even when onReady throws

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

@@ -50,6 +50,8 @@ test('composeJellyfinRuntimeHandlers returns callable jellyfin runtime handlers'
       getMpvClient: () => null,
       sendMpvCommand: () => {},
       wait: async () => {},
+      cacheSubtitleTrack: async () => ({ path: '/tmp/sub.srt', cleanupDir: '/tmp/subs' }),
+      cleanupCachedSubtitles: () => {},
       logDebug: () => {},
     },
     playJellyfinItemInMpvMainDeps: {
@@ -58,11 +60,16 @@ test('composeJellyfinRuntimeHandlers returns callable jellyfin runtime handlers'
         mode: 'direct',
         url: 'https://example.test/video.m3u8',
         title: 'Episode 1',
+        itemTitle: 'Episode 1',
+        seriesTitle: null,
+        seasonNumber: null,
+        episodeNumber: null,
         startTimeTicks: 0,
         audioStreamIndex: null,
         subtitleStreamIndex: null,
       }),
       applyJellyfinMpvDefaults: () => {},
+      showVisibleOverlay: () => {},
       sendMpvCommand: () => {},
       armQuitOnDisconnect: () => {},
       schedule: () => undefined,
@@ -189,6 +196,7 @@ test('composeJellyfinRuntimeHandlers returns callable jellyfin runtime handlers'
   assert.equal(typeof composed.handleJellyfinRemotePlaystate, 'function');
   assert.equal(typeof composed.handleJellyfinRemoteGeneralCommand, 'function');
   assert.equal(typeof composed.playJellyfinItemInMpv, 'function');
+  assert.equal(typeof composed.cleanupJellyfinSubtitleCache, 'function');
   assert.equal(typeof composed.startJellyfinRemoteSession, 'function');
   assert.equal(typeof composed.stopJellyfinRemoteSession, 'function');
   assert.equal(typeof composed.runJellyfinCommand, 'function');

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

@@ -142,6 +142,7 @@ export type JellyfinRuntimeComposerResult = ComposerOutputs<{
     typeof composeJellyfinRemoteHandlers
   >['handleJellyfinRemoteGeneralCommand'];
   playJellyfinItemInMpv: ReturnType<typeof createPlayJellyfinItemInMpvHandler>;
+  cleanupJellyfinSubtitleCache: () => void;
   startJellyfinRemoteSession: ReturnType<typeof createStartJellyfinRemoteSessionHandler>;
   stopJellyfinRemoteSession: ReturnType<typeof createStopJellyfinRemoteSessionHandler>;
   runJellyfinCommand: ReturnType<typeof createRunJellyfinCommandHandler>;
@@ -280,6 +281,7 @@ export function composeJellyfinRuntimeHandlers(
     handleJellyfinRemotePlaystate,
     handleJellyfinRemoteGeneralCommand,
     playJellyfinItemInMpv,
+    cleanupJellyfinSubtitleCache: () => preloadJellyfinExternalSubtitles.cleanupCachedSubtitles(),
     startJellyfinRemoteSession,
     stopJellyfinRemoteSession,
     runJellyfinCommand,

src/main/runtime/composers/startup-lifecycle-composer.test.ts

@@ -49,6 +49,7 @@ test('composeStartupLifecycleHandlers returns callable startup lifecycle handler
       clearYomitanSettingsWindow: () => {},
       stopJellyfinRemoteSession: async () => {},
       cleanupYoutubeSubtitleTempDirs: () => {},
+      cleanupJellyfinSubtitleCache: () => {},
       stopDiscordPresenceService: () => {},
     },
     shouldRestoreWindowsOnActivateMainDeps: {