Fix issue with grouped notifications UI due to recent API change (#31224)

app/javascript/mastodon/api_types/notifications.ts

@@ -60,7 +60,7 @@ export interface BaseNotificationGroupJSON {
 
 interface NotificationGroupWithStatusJSON extends BaseNotificationGroupJSON {
   type: NotificationWithStatusType;
-  status: ApiStatusJSON;
+  status_id: string;
 }
 
 interface NotificationWithStatusJSON extends BaseNotificationJSON {

app/javascript/mastodon/models/notification_group.ts

@@ -124,9 +124,9 @@ export function createNotificationGroupFromJSON(
     case 'mention':
     case 'poll':
     case 'update': {
-      const { status, ...groupWithoutStatus } = group;
+      const { status_id: statusId, ...groupWithoutStatus } = group;
       return {
-        statusId: status.id,
+        statusId,
         sampleAccountIds,
         ...groupWithoutStatus,
       };