feat: change render mode in browser demo.

demo/Semi.Avalonia.Demo.Web/Program.cs

@@ -11,7 +11,10 @@ internal sealed partial class Program
 {
     private static Task Main(string[] args) => BuildAvaloniaApp()
         .WithSourceHanSansCNFont()
-        .StartBrowserAppAsync("out");
+        .StartBrowserAppAsync("out", new BrowserPlatformOptions
+        {
+            RenderingMode = [ BrowserRenderingMode.WebGL2, BrowserRenderingMode.WebGL1, BrowserRenderingMode.Software2D],
+        });
 
     public static AppBuilder BuildAvaloniaApp()
         => AppBuilder.Configure<App>();