private async void MarkdownBlock_LinkClicked(object sender, CommunityToolkit.WinUI.UI.Controls.LinkClickedEventArgs e)
 {
     await Launcher.LaunchUriAsync(new Uri(e.Link));
 }
 private void richBlock_LinkClicked(object sender, CommunityToolkit.WinUI.UI.Controls.LinkClickedEventArgs e)
 {
     // App.AppViewModel.HandleUri(e.Link);
 }