rework throttle

reuse throttle mechanism for catching global keys

Azaion.Annotator/App.xaml.cs

@@ -9,6 +9,7 @@ using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Hosting;
 using Microsoft.Extensions.Logging;
 using Serilog;
+using Azaion.Annotator.Extensions;
 
 namespace Azaion.Annotator;
 
@@ -71,6 +72,6 @@ public partial class App : Application
     private void GlobalClick(object sender, RoutedEventArgs e)
     {
         var args = (KeyEventArgs)e;
-        _mediator.Publish(new KeyEvent(sender, args));
+        _ = ThrottleExt.Throttle(() => _mediator.Publish(new KeyEvent(sender, args)), TimeSpan.FromMilliseconds(50));
     }
 }