feat: mention

app/(app)/notifications/page.tsx

@@ -137,14 +137,16 @@ function NotificationRow({
     </div>
   );
 
-  // A like links to your own post; everything else links to the actor's
-  // profile (when we know their handle).
+  // A like links to your own post; a mention links to the actor's post you
+  // were tagged in; everything else links to the actor's profile.
   const href =
     n.kind === "post_like" && n.post_id
       ? `/u/${selfHandle}/posts#post-${n.post_id}`
-      : n.actor_handle
-        ? `/u/${n.actor_handle}`
-        : null;
+      : n.kind === "post_mention" && n.post_id && n.actor_handle
+        ? `/u/${n.actor_handle}/posts#post-${n.post_id}`
+        : n.actor_handle
+          ? `/u/${n.actor_handle}`
+          : null;
 
   return href ? (
     <li>
@@ -177,6 +179,8 @@ function messageFor(n: AppNotification): string {
       if (others <= 0) return "liked your post.";
       return `and ${others} ${others === 1 ? "other" : "others"} liked your post.`;
     }
+    case "post_mention":
+      return "mentioned you in a post.";
     default:
       return "sent you a notification.";
   }