ui enhancements

app/u/[handle]/profile-context.tsx

@@ -0,0 +1,19 @@
+"use client";
+
+import { createContext, useContext } from "react";
+import type { PublicProfile } from "@/lib/social";
+
+/** Set by the /u/[handle] layout after it fetches the profile. Child
+ *  pages read it to render content (e.g. the Collections tab needs the
+ *  profile's `public_collections` array) without a second fetch. */
+export const PublicProfileContext = createContext<PublicProfile | null>(null);
+
+export function usePublicProfile(): PublicProfile {
+  const v = useContext(PublicProfileContext);
+  if (!v) {
+    throw new Error(
+      "usePublicProfile must be used inside the /u/[handle] layout",
+    );
+  }
+  return v;
+}