feat(launcher): Campaign LA add Avalonia desktop shell

src/AcDream.Launcher/MainWindow.axaml.cs

@@ -0,0 +1,41 @@
+using AcDream.Launcher.ViewModels;
+using Avalonia.Controls;
+using Avalonia.Markup.Xaml;
+using Avalonia.Threading;
+
+namespace AcDream.Launcher;
+
+public sealed partial class MainWindow : Window
+{
+    private readonly DispatcherTimer _statusTimer;
+
+    public MainWindow()
+    {
+        AvaloniaXamlLoader.Load(this);
+        _statusTimer = new DispatcherTimer
+        {
+            Interval = TimeSpan.FromMilliseconds(250),
+        };
+        _statusTimer.Tick += OnStatusTimerTick;
+        Opened += OnOpened;
+        Closed += OnClosed;
+    }
+
+    private void OnOpened(object? sender, EventArgs e) => _statusTimer.Start();
+
+    private void OnClosed(object? sender, EventArgs e)
+    {
+        _statusTimer.Stop();
+        _statusTimer.Tick -= OnStatusTimerTick;
+        Opened -= OnOpened;
+        Closed -= OnClosed;
+    }
+
+    private void OnStatusTimerTick(object? sender, EventArgs e)
+    {
+        if (DataContext is LauncherWindowViewModel viewModel)
+        {
+            viewModel.PollStatus();
+        }
+    }
+}