Grouped Notifications UI (#30440)

Co-authored-by: Eugen Rochko <eugen@zeonfederated.com>
Co-authored-by: Claire <claire.github-309c@sitedethib.com>

app/javascript/mastodon/features/notifications_wrapper.jsx

@@ -0,0 +1,13 @@
+import Notifications from 'mastodon/features/notifications';
+import Notifications_v2 from 'mastodon/features/notifications_v2';
+import { useAppSelector } from 'mastodon/store';
+
+export const NotificationsWrapper = (props) => {
+  const optedInGroupedNotifications = useAppSelector((state) => state.getIn(['settings', 'notifications', 'groupingBeta'], false));
+
+  return (
+    optedInGroupedNotifications ? <Notifications_v2 {...props} /> : <Notifications {...props} />
+  );
+};
+
+export default NotificationsWrapper;