feat: add user centric features

app/u/[handle]/posts/page.tsx

@@ -0,0 +1,70 @@
+"use client";
+
+/**
+ * /u/[handle]/posts — public Instagram-style scroll feed.
+ *
+ * Mirrors /u/me/posts but read-only (no Delete / Update background). The
+ * grid thumbnail on /u/[handle] links here with a `#post-<id>` hash so
+ * the feed scrolls to the tapped post on mount.
+ */
+
+import { use, useEffect, useRef, useState } from "react";
+import { notFound } from "next/navigation";
+import { profile, SocialError, type Post } from "@/lib/social";
+import { PostScrollCard } from "@/components/social/post-scroll-card";
+
+export default function PublicPostsFeedPage(props: {
+  params: Promise<{ handle: string }>;
+}) {
+  const { handle } = use(props.params);
+  const [feed, setFeed] = useState<Post[]>([]);
+  const [loading, setLoading] = useState(true);
+  const [missing, setMissing] = useState(false);
+  const scrolledToHashRef = useRef(false);
+
+  useEffect(() => {
+    let cancelled = false;
+    setLoading(true);
+    profile
+      .feed(handle, 60)
+      .then((rows) => {
+        if (cancelled) return;
+        setFeed(rows ?? []);
+      })
+      .catch((err) => {
+        if (err instanceof SocialError && err.status === 404) {
+          setMissing(true);
+        }
+      })
+      .finally(() => !cancelled && setLoading(false));
+    return () => {
+      cancelled = true;
+    };
+  }, [handle]);
+
+  useEffect(() => {
+    if (loading || feed.length === 0 || scrolledToHashRef.current) return;
+    if (typeof window === "undefined") return;
+    const hash = window.location.hash;
+    if (!hash) return;
+    scrolledToHashRef.current = true;
+    requestAnimationFrame(() => {
+      const el = document.getElementById(hash.slice(1));
+      if (el) el.scrollIntoView({ block: "start", behavior: "auto" });
+    });
+  }, [loading, feed.length]);
+
+  if (missing) notFound();
+
+  return (
+    <main className="flex-1 max-w-xl w-full mx-auto px-3 sm:px-4 py-4 sm:py-6 space-y-6">
+      {loading ? (
+        <p className="text-sm text-muted-foreground">Loading…</p>
+      ) : feed.length === 0 ? (
+        <p className="text-sm text-muted-foreground">No posts yet.</p>
+      ) : (
+        feed.map((p) => <PostScrollCard key={p.id} post={p} />)
+      )}
+    </main>
+  );
+}