refactor: remove invisible subtitle overlay code

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

@@ -68,12 +68,14 @@ test('composeMpvRuntimeHandlers returns callable handlers and forwards to inject
       scheduleQuitCheck: () => {},
       quitApp: () => {},
       reportJellyfinRemoteStopped: () => {},
+      syncOverlayMpvSubtitleSuppression: () => {},
       maybeRunAnilistPostWatchUpdate: async () => {},
       logSubtitleTimingError: () => {},
       broadcastToOverlayWindows: () => {},
       onSubtitleChange: () => {},
       refreshDiscordPresence: () => {},
       updateCurrentMediaPath: () => {},
+      restoreMpvSubVisibilityForInvisibleOverlay: () => {},
       getCurrentAnilistMediaKey: () => null,
       resetAnilistMediaTracking: () => {},
       maybeProbeAnilistDuration: () => {},