Polish AmiReel UI and improve render workflow

AmiReel.WinUI/MainWindow.xaml.cs

@@ -0,0 +1,27 @@
+using Microsoft.UI.Xaml;
+
+// To learn more about WinUI, the WinUI project structure,
+// and more about our project templates, see: http://aka.ms/winui-project-info.
+
+namespace AmiReel_WinUI;
+
+/// <summary>
+/// The application window. This hosts a Frame that displays pages. Add your
+/// UI and logic to MainPage.xaml / MainPage.xaml.cs instead of here so you
+/// can use Page features such as navigation events and the Loaded lifecycle.
+/// </summary>
+public sealed partial class MainWindow : Window
+{
+    public MainWindow()
+    {
+        InitializeComponent();
+
+        ExtendsContentIntoTitleBar = true;
+        SetTitleBar(AppTitleBar);
+
+        AppWindow.SetIcon("Assets/AppIcon.ico");
+
+        // Navigate the root frame to the main page on startup.
+        RootFrame.Navigate(typeof(MainPage));
+    }
+}