fix: resolve macOS tray click crash

lib/app.dart

@@ -9,6 +9,7 @@ import 'application/providers/credentials_provider.dart';
 import 'application/providers/locale_provider.dart';
 import 'application/providers/navigation_provider.dart';
 import 'application/providers/playback_provider.dart';
+import 'domain/entities/playback_state.dart';
 import 'core/services/system_tray_service.dart';
 import 'presentation/screens/home_screen.dart';
 import 'presentation/screens/login_screen.dart';
@@ -55,6 +56,7 @@ class _AppShellState extends ConsumerState<_AppShell> with WindowListener {
   final _systemTray = SystemTrayService();
   final _navigatorKey = GlobalKey<NavigatorState>();
   bool _isExiting = false;
+  ProviderSubscription? _playbackSubscription;
 
   @override
   void initState() {
@@ -80,6 +82,7 @@ class _AppShellState extends ConsumerState<_AppShell> with WindowListener {
 
   @override
   void dispose() {
+    _playbackSubscription?.close();
     windowManager.removeListener(this);
     _systemTray.dispose();
     super.dispose();
@@ -124,11 +127,12 @@ class _AppShellState extends ConsumerState<_AppShell> with WindowListener {
     );
 
     // Listen to playback state changes to update tray
-    ref.listenManual(playbackProvider, (previous, next) {
+    _playbackSubscription = ref.listenManual(playbackProvider, (previous, next) {
+      final state = next as PlaybackState;
       _systemTray.updatePlaybackState(
-        isPlaying: next.isPlaying,
-        trackName: next.currentTrack?.name,
-        artistName: next.currentTrack?.artistNames,
+        isPlaying: state.isPlaying,
+        trackName: state.currentTrack?.name,
+        artistName: state.currentTrack?.artistNames,
       );
     });
   }

lib/core/services/system_tray_service.dart

@@ -50,6 +50,7 @@ class SystemTrayService {
   SystemTrayService._internal();
 
   final SystemTray _systemTray = SystemTray();
+  final AppWindow _appWindow = AppWindow();
 
   bool _isInitialized = false;
   TrayCallback? _onShowWindow;
@@ -275,18 +276,29 @@ class SystemTrayService {
   /// Show the main window
   /// Uses opacity trick to prevent transparent window flash on restore
   Future<void> showWindow() async {
-    // Set opacity to 0 before showing to prevent transparent flash
-    await windowManager.setOpacity(0);
-    await windowManager.show();
-    await windowManager.focus();
-    // Small delay to let Flutter render, then restore opacity
-    await Future<void>.delayed(const Duration(milliseconds: 50));
-    await windowManager.setOpacity(1);
+    if (Platform.isMacOS) {
+      // On macOS, use system_tray's AppWindow to avoid window_manager nil crash
+      await _appWindow.show();
+    } else {
+      // On Windows/Linux, use window_manager with opacity trick
+      await windowManager.setOpacity(0);
+      await windowManager.show();
+      await windowManager.focus();
+      // Small delay to let Flutter render, then restore opacity
+      await Future<void>.delayed(const Duration(milliseconds: 50));
+      await windowManager.setOpacity(1);
+    }
   }
 
   /// Hide the window to tray
   Future<void> hideToTray() async {
-    await windowManager.hide();
+    try {
+      await windowManager.hide();
+    } catch (e) {
+      // Fallback: use AppWindow.hide() which minimizes on macOS
+      AppLogger.warning('windowManager.hide() failed, using fallback', e);
+      await _appWindow.hide();
+    }
   }
 
   /// Dispose of tray resources

macos/Runner/AppDelegate.swift

@@ -16,7 +16,8 @@ class AppDelegate: FlutterAppDelegate {
   }
 
   override func applicationShouldTerminateAfterLastWindowClosed(_ sender: NSApplication) -> Bool {
-    return true
+    // Return false to allow the app to keep running when minimized to tray
+    return false
   }
 
   override func applicationSupportsSecureRestorableState(_ app: NSApplication) -> Bool {