feat: media player

GameBarPanel.qml

@@ -104,6 +104,8 @@ FocusScope {
                     return audioWidgetComponent;
                 case "apps":
                     return appsWidgetComponent;
+                case "media":
+                    return mediaWidgetComponent;
                 case "home":
                     return homeWidgetComponent;
                 case "system":
@@ -126,6 +128,12 @@ FocusScope {
         GameBarAppMixer {}
     }
 
+    Component {
+        id: mediaWidgetComponent
+
+        GameBarMediaWidget {}
+    }
+
     Component {
         id: homeWidgetComponent