fix(notifications): break CommentToIU so it doesn't fall through to default

getNotificationParties' CommentToIU case had no break and fell through to default,
which strict-parses me().id and task.assigneeId — throwing (ZodError "Required") when
me() returns null or the task is unassigned. The comment job only consumes
recipientIds/senderCompanyId (both set in the CommentToIU case), so the fallthrough's
values were unused anyway.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: arpandhakal

src/app/api/notification/notification.service.ts

@@ -601,6 +601,7 @@ export class NotificationService extends BaseService {
             )
             .map((iu) => iu.id)
         }
+        break
       default:
         const userInfo = await this.copilot.me()
         senderId = z.string().parse(userInfo?.id)