feat: focus dialog after showing modal

src/Ursa/Controls/OverlayShared/OverlayDialogHost.Dialog.cs

@@ -173,6 +173,7 @@ public partial class OverlayDialogHost
         _modalCount++;
         IsInModalStatus = _modalCount > 0;
         control.IsClosed = false;
+        control.Focus();
     }
 
     // Handle dialog layer change event

src/Ursa/Controls/OverlayShared/OverlayDialogHost.Drawer.cs

@@ -67,6 +67,8 @@ public partial class OverlayDialogHost
         {
             await Task.WhenAll(animation.RunAsync(control), _maskAppearAnimation.RunAsync(mask));
         }
+
+        control.Focus();
     }
 
     private void SetDrawerPosition(DrawerControlBase control)

src/Ursa/Controls/OverlayShared/OverlayFeedbackElement.cs

@@ -20,6 +20,7 @@ public abstract class OverlayFeedbackElement: ContentControl
     
     static OverlayFeedbackElement()
     {
+        FocusableProperty.OverrideDefaultValue<OverlayFeedbackElement>(true);
         DataContextProperty.Changed.AddClassHandler<OverlayFeedbackElement, object?>((o, e) => o.OnDataContextChange(e));
         ClosedEvent.AddClassHandler<OverlayFeedbackElement>((o,e)=>o.OnClosed(e));
     }