feat: update getNotificationsDetailed to use notification.did for fetching actor profile

src/lib/notifications.ts

···
         }
       } else if (notification.$type === "social.grain.graph.follow") {
         reasonSubject = getActorProfile(
-          notification.subject,
+          notification.did,
           ctx,
         ) ?? undefined;
       } else if (notification.$type === "social.grain.comment") {