Dynamically set tray icon variant (light/dark) based on platform them…

lib/init.dart

@@ -32,9 +32,14 @@ Future<void> init() async {
   // load system accent color
   await SystemTheme.accentColor.load();
 
+  initTrayIcon();
+}
+
+Future<void> initTrayIcon([Brightness platformBrightness = Brightness.light]) async {
   // tray icon init
   try {
-    await trayManager.setIcon(Platform.isWindows ? 'assets/tray/icon.ico' : 'assets/tray/icon.png');
+    final iconName = platformBrightness.isDark ? 'icon_light' : 'icon_dark';
+    await trayManager.setIcon(Platform.isWindows ? 'assets/tray/$iconName.ico' : 'assets/tray/$iconName.png');
     if (Platform.isLinux) {
       // Don't show title on macOS (takes up more space in menu bar)
       // Not supported on Windows

lib/main.dart

@@ -47,6 +47,15 @@ class _MyAppState extends State<MyApp> {
       .toList(growable: false);
   late final _argsMap = {for (final instance in _argsInstances) instance.label: instance};
 
+  @override
+  void initState() {
+    super.initState();
+    WidgetsBinding.instance.addPostFrameCallback((_) {
+      final platformBrightness = MediaQuery.of(context).platformBrightness;
+      initTrayIcon(platformBrightness);
+    });
+  }
+
   @override
   Widget build(BuildContext context) {
     return FutureBuilder(