Add search view (NIP-50 + hashtag + people)

- searchNotes: NIP-50 full-text for text queries, #t tag filter for #hashtags
- searchUsers: NIP-50 kind 0 search for people
- SearchView with tabbed notes/people results, follow/unfollow inline
- Hashtag queries skip people search and use universal #t filter
- Graceful empty state explains NIP-50 relay support caveat
- Search added to sidebar nav (⌕)

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

src/lib/nostr/client.ts

@@ -226,6 +226,31 @@ export async function fetchUserNotes(pubkey: string, limit = 30): Promise<NDKEve
   return Array.from(events).sort((a, b) => (b.created_at ?? 0) - (a.created_at ?? 0));
 }
 
+export async function searchNotes(query: string, limit = 50): Promise<NDKEvent[]> {
+  const instance = getNDK();
+  const isHashtag = query.startsWith("#");
+  const filter: NDKFilter & { search?: string } = isHashtag
+    ? { kinds: [NDKKind.Text], "#t": [query.slice(1).toLowerCase()], limit }
+    : { kinds: [NDKKind.Text], search: query, 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 searchUsers(query: string, limit = 20): Promise<NDKEvent[]> {
+  const instance = getNDK();
+  const filter: NDKFilter & { search?: string } = {
+    kinds: [NDKKind.Metadata],
+    search: query,
+    limit,
+  };
+  const events = await instance.fetchEvents(filter, {
+    cacheUsage: NDKSubscriptionCacheUsage.ONLY_RELAY,
+  });
+  return Array.from(events);
+}
+
 export async function fetchReactionCount(eventId: string): Promise<number> {
   const instance = getNDK();
   const filter: NDKFilter = {

src/lib/nostr/index.ts

@@ -1 +1 @@
-export { getNDK, connectToRelays, fetchGlobalFeed, fetchFollowFeed, fetchReplies, publishNote, publishArticle, publishProfile, publishReaction, publishReply, publishContactList, fetchReactionCount, fetchUserNotes, fetchProfile, getStoredRelayUrls, addRelay, removeRelay } from "./client";
+export { getNDK, connectToRelays, fetchGlobalFeed, fetchFollowFeed, fetchReplies, publishNote, publishArticle, publishProfile, publishReaction, publishReply, publishContactList, fetchReactionCount, fetchUserNotes, fetchProfile, getStoredRelayUrls, addRelay, removeRelay, searchNotes, searchUsers } from "./client";