fix(macos): restore traffic lights on player exit

lib/widgets/video_controls/parts/visibility.dart

@@ -249,10 +249,12 @@ extension _PlexVideoControlsVisibilityMethods on _PlexVideoControlsState {
   }
 
   void _updateTrafficLightVisibility() async {
+    final generation = ++_trafficLightVisibilityGeneration;
     // When maximized or fullscreen, always keep traffic lights visible so the
     // user can reach them without the controls-hide-on-mouse-leave race.
     // In normal windowed mode, toggle with controls as before.
     final isMaximizedOrFullscreen = await windowManager.isMaximized() || await windowManager.isFullScreen();
+    if (!mounted || generation != _trafficLightVisibilityGeneration) return;
     final visible = isMaximizedOrFullscreen || _forceShowControls ? true : _showControls;
     await MacOSWindowService.setTrafficLightsVisible(visible);
   }

lib/widgets/video_controls/video_controls.dart

@@ -362,6 +362,7 @@ class _PlexVideoControlsState extends State<PlexVideoControls> with WindowListen
   Timer? _lockIconTimer;
   bool get _clickVideoTogglesPlayback => _settings.read(SettingsService.clickVideoTogglesPlayback);
   bool _isContentStripVisible = false; // Whether the swipe-up content strip is showing
+  int _trafficLightVisibilityGeneration = 0;
 
   // GlobalKey to access DesktopVideoControls state for focus management
   final GlobalKey<DesktopVideoControlsState> _desktopControlsKey = GlobalKey<DesktopVideoControlsState>();
@@ -524,6 +525,8 @@ class _PlexVideoControlsState extends State<PlexVideoControls> with WindowListen
     }
     if (Platform.isMacOS) {
       _pipService.isPipActive.removeListener(_onMacPipChanged);
+      _trafficLightVisibilityGeneration++;
+      unawaited(MacOSWindowService.setTrafficLightsVisible(true));
     }
     super.dispose();
   }