Native tray icon implementation.

Wino.Mail.WinUI/WelcomeWindow.xaml.cs

@@ -1,13 +1,17 @@
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.UI.Windowing;
+using Microsoft.UI.Xaml;
 using Microsoft.UI.Xaml.Controls;
 using Wino.Core.Domain.Interfaces;
+using Wino.Mail.WinUI.Interfaces;
 using WinUIEx;
 
 namespace Wino.Mail.WinUI;
 
 public sealed partial class WelcomeWindow : WindowEx
 {
+    private bool _allowClose;
+
     public Frame GetRootFrame() => RootFrame;
 
     public WelcomeWindow()
@@ -20,6 +24,7 @@ public sealed partial class WelcomeWindow : WindowEx
         this.SetIcon("Assets/Wino_Icon.ico");
 
         ConfigureWindowChrome();
+        AppWindow.Closing += OnAppWindowClosing;
     }
 
     private void ConfigureWindowChrome()
@@ -34,4 +39,20 @@ public sealed partial class WelcomeWindow : WindowEx
         var themeService = WinoApplication.Current.Services.GetService<INewThemeService>();
         themeService?.UpdateSystemCaptionButtonColors();
     }
+
+    private void OnAppWindowClosing(object sender, AppWindowClosingEventArgs e)
+    {
+        if (_allowClose || (Application.Current as App)?.IsExiting == true)
+            return;
+
+        e.Cancel = true;
+
+        var windowManager = WinoApplication.Current.Services.GetService<IWinoWindowManager>();
+        windowManager?.HideWindow(this);
+    }
+
+    public void AllowClose()
+    {
+        _allowClose = true;
+    }
 }