Add profile view with clickable names/avatars

- ProfileView shows avatar, bio, nip05, website, recent notes
- Clicking any name or avatar navigates to their profile
- Add fetchUserNotes to nostr lib (kind 1 by author)
- Add openProfile action + selectedPubkey to UI store
- Back button returns to feed

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/lib/nostr/client.ts

@@ -99,6 +99,19 @@ export async function publishNote(content: string): Promise<void> {
   await event.publish();
 }
 
+export async function fetchUserNotes(pubkey: string, limit = 30): Promise<NDKEvent[]> {
+  const instance = getNDK();
+  const filter: NDKFilter = {
+    kinds: [NDKKind.Text],
+    authors: [pubkey],
+    limit,
+  };
+  const events = await instance.fetchEvents(filter, {
+    cacheUsage: NDKSubscriptionCacheUsage.ONLY_RELAY,
+  });
+  return Array.from(events).sort((a, b) => (b.created_at ?? 0) - (a.created_at ?? 0));
+}
+
 export async function fetchProfile(pubkey: string) {
   const instance = getNDK();
   const user = instance.getUser({ pubkey });

src/lib/nostr/index.ts

@@ -1 +1 @@
-export { getNDK, connectToRelays, fetchGlobalFeed, publishNote, publishReaction, publishReply, fetchProfile } from "./client";
+export { getNDK, connectToRelays, fetchGlobalFeed, publishNote, publishReaction, publishReply, fetchUserNotes, fetchProfile } from "./client";