Add mute/ignore user + anti-spam (roadmap #5, NIP-51)

- fetchMuteList / publishMuteList in nostr client (kind 10000)
- mute store: mutedPubkeys persisted to localStorage + synced to relay;
  mute/unmute publish kind 10000 best-effort; fetchMuteList merges relay
  list with local mutes on login
- fetchMuteList called after every login (nsec + pubkey)
- Feed: muted pubkeys filtered from both Global and Following tabs
- NoteCard: ⋯ context menu (appears on hover, hidden for own notes)
  with mute / unmute action; backdrop click closes menu
- ProfileView: mute / unmute button in the action row (next to follow)
- SettingsView: MuteSection lists muted accounts with name + avatar;
  hover to reveal unmute button; hidden when mute list is empty

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

src/lib/nostr/client.ts

@@ -274,6 +274,27 @@ export async function publishContactList(pubkeys: string[]): Promise<void> {
   await event.publish();
 }
 
+export async function fetchMuteList(pubkey: string): Promise<string[]> {
+  const instance = getNDK();
+  const filter: NDKFilter = { kinds: [10000 as NDKKind], authors: [pubkey], limit: 1 };
+  const events = await instance.fetchEvents(filter, {
+    cacheUsage: NDKSubscriptionCacheUsage.ONLY_RELAY,
+  });
+  if (events.size === 0) return [];
+  const event = Array.from(events).sort((a, b) => (b.created_at ?? 0) - (a.created_at ?? 0))[0];
+  return event.tags.filter((t) => t[0] === "p" && t[1]).map((t) => t[1]);
+}
+
+export async function publishMuteList(pubkeys: string[]): Promise<void> {
+  const instance = getNDK();
+  if (!instance.signer) return;
+  const event = new NDKEvent(instance);
+  event.kind = 10000 as NDKKind;
+  event.content = "";
+  event.tags = pubkeys.map((pk) => ["p", pk]);
+  await event.publish();
+}
+
 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, fetchFollowFeed, fetchReplies, publishNote, publishArticle, publishProfile, publishReaction, publishReply, publishContactList, fetchReactionCount, fetchUserNotes, fetchProfile, getStoredRelayUrls, addRelay, removeRelay, searchNotes, searchUsers } from "./client";
+export { getNDK, connectToRelays, fetchGlobalFeed, fetchFollowFeed, fetchReplies, publishNote, publishArticle, publishProfile, publishReaction, publishReply, publishContactList, fetchReactionCount, fetchUserNotes, fetchProfile, fetchMuteList, publishMuteList, getStoredRelayUrls, addRelay, removeRelay, searchNotes, searchUsers } from "./client";