Add headless mode to desktop

lib/features/system_tray/controller/system_tray_controller.dart

@@ -50,12 +50,10 @@ class SystemTrayController extends _$SystemTrayController
 
   Future<void> _updateTray() async {
     final t = ref.watch(translationsProvider);
-    final isVisible = await windowManager.isVisible();
     final trayMenu = Menu(
       items: [
-        MenuItem.checkbox(
+        MenuItem(
           label: t.tray.dashboard,
-          checked: isVisible,
           onClick: handleClickShowApp,
         ),
         if (mode != null) ...[
@@ -85,6 +83,11 @@ class SystemTrayController extends _$SystemTrayController
     await trayManager.setContextMenu(trayMenu);
   }
 
+  @override
+  Future<void> onTrayIconMouseDown() async {
+    await windowManager.show();
+  }
+
   @override
   Future<void> onTrayIconRightMouseDown() async {
     super.onTrayIconRightMouseDown();
@@ -92,12 +95,9 @@ class SystemTrayController extends _$SystemTrayController
   }
 
   Future<void> handleClickShowApp(MenuItem menuItem) async {
-    if (menuItem.checked == true) {
-      await windowManager.close();
-    } else {
+    if (await windowManager.isVisible()) return;
     await windowManager.show();
   }
-  }
 
   Future<void> handleClickModeItem(
     TunnelMode mode,

lib/services/window_manager_service.dart

@@ -11,9 +11,15 @@ class WindowManagerService with WindowListener {
       center: true,
     );
     await windowManager.waitUntilReadyToShow(windowOptions);
+    await windowManager.setPreventClose(true);
     windowManager.addListener(this);
   }
 
+  @override
+  Future<void> onWindowClose() async {
+    await windowManager.hide();
+  }
+
   void dispose() {
     windowManager.removeListener(this);
   }