Make the macOS menu bar icon a template image

src/UniGetUI.Avalonia/Infrastructure/TrayService.cs

@@ -38,7 +38,18 @@ public TrayService(MainWindow owner)
             Menu = BuildMenu(owner, _restartComputerItem),
         };
 
+        // macOS tints the menu bar from the wallpaper, not from the system appearance, so no theme
+        // check can pick the right glyph; a template icon is masked and tinted by macOS itself.
+        if (OperatingSystem.IsMacOS())
+        {
+            MacOSProperties.SetIsTemplateIcon(_trayIcon, true);
+        }
+
         PendingRebootStore.Changed += OnPendingRebootStoreChanged;
+        if (Application.Current?.PlatformSettings is { } platformSettings)
+        {
+            platformSettings.ColorValuesChanged += OnPlatformColorValuesChanged;
+        }
 
         _trayIcon.Clicked += (_, _) => Dispatcher.UIThread.Post(() => owner.ShowFromTray());
 
@@ -144,15 +155,30 @@ private static bool IsTaskbarLight()
             return false;
         }
 #else
-        // On Linux (and other platforms), mirror the app's active theme variant so
-        // the icon remains legible regardless of the desktop colour scheme.
-        return Application.Current?.ActualThemeVariant == ThemeVariant.Light;
+        // macOS: the icon is a template (see the constructor), only its alpha is used.
+        if (OperatingSystem.IsMacOS())
+        {
+            return true;
+        }
+
+        // The Linux panel follows the desktop appearance, not UniGetUI's own theme.
+        var app = Application.Current;
+        PlatformThemeVariant? osVariant = app?.PlatformSettings?.GetColorValues().ThemeVariant;
+        if (osVariant is not null)
+        {
+            return osVariant == PlatformThemeVariant.Light;
+        }
+
+        return app?.ActualThemeVariant == ThemeVariant.Light;
 #endif
     }
 
     private void OnPendingRebootStoreChanged(object? sender, EventArgs e)
         => Dispatcher.UIThread.Post(UpdateStatus);
 
+    private void OnPlatformColorValuesChanged(object? sender, PlatformColorValues e)
+        => Dispatcher.UIThread.Post(UpdateStatus);
+
     private static NativeMenu BuildMenu(MainWindow owner, NativeMenuItem restartComputerItem)
     {
         var menu = new NativeMenu();
@@ -194,6 +220,11 @@ public void Dispose()
     {
         PendingRebootStore.Changed -= OnPendingRebootStoreChanged;
         var app = Application.Current;
+        if (app?.PlatformSettings is { } platformSettings)
+        {
+            platformSettings.ColorValuesChanged -= OnPlatformColorValuesChanged;
+        }
+
         if (app is not null)
             TrayIcon.GetIcons(app)?.Remove(_trayIcon);
         _trayIcon.Dispose();