Change order of operations in Window.Destroying to dispose scope after disconnecting handler

Co-authored-by: PureWeen <[email protected]>

Author: Copilot

src/Controls/src/Core/Window/Window.cs

@@ -553,11 +553,11 @@ void IWindow.Destroying()
 			AlertManager.Unsubscribe();
 			Application?.RemoveWindow(this);
 
-			// Dispose the window-scoped service scope
-			if (Handler?.MauiContext is MauiContext mauiContext)
-				mauiContext.DisposeWindowScope();
-			
+			var mauiContext = Handler?.MauiContext as MauiContext;
 			Handler?.DisconnectHandler();
+
+			// Dispose the window-scoped service scope
+			mauiContext?.DisposeWindowScope();
 		}
 
 		void IWindow.Resumed()