[Settings] Shortcut edit dialog: Fix bugs (#25060)

* custom error badge

* fix theme bug

* fix focus bug (#25051)

* use Infobar control

* add comments

src/settings-ui/Settings.UI.Library/HotkeySettingsControlHook.cs

@@ -79,6 +79,8 @@ namespace Microsoft.PowerToys.Settings.UI.Library
             }
         }
 
+        public bool GetDisposedState() => disposedValue;
+
         public void Dispose()
         {
             Dispose(disposing: true);