Add follows view with followers/following tabs and new follower badges

Followers tab fetches kind 3 events referencing the user, following tab
shows the contact list. Each row has avatar, NIP-05 badge, follow/unfollow
button, and "follows you" indicator. New follower notifications from the
background poller increment a sidebar badge that clears on view open.

src/lib/nostr/index.ts

@@ -1,6 +1,6 @@
 export { getNDK, getNDKUptimeMs, connectToRelays, ensureConnected, resetNDK, getStoredRelayUrls, addRelay, removeRelay, fetchWithTimeout, withTimeout, FEED_TIMEOUT, THREAD_TIMEOUT, SINGLE_TIMEOUT } from "./core";
 export { fetchGlobalFeed, fetchFollowFeed, fetchUserNotes, fetchUserNotesNIP65, fetchNoteById, fetchReplies, publishNote, publishReply, publishRepost, publishQuote, fetchHashtagFeed, fetchThreadEvents, fetchAncestors } from "./notes";
-export { publishProfile, publishContactList, fetchProfile, fetchFollowSuggestions, fetchMentions, fetchNewFollowers } from "./social";
+export { publishProfile, publishContactList, fetchProfile, fetchFollowSuggestions, fetchMentions, fetchFollowers, fetchNewFollowers } from "./social";
 export { publishArticle, fetchArticle, fetchAuthorArticles, fetchArticleFeed, searchArticles, fetchByAddr } from "./articles";
 export { publishReaction, fetchReactionCount, fetchReplyCount, fetchZapCount, fetchBatchEngagement, fetchZapsReceived, fetchZapsSent } from "./engagement";
 export { fetchDMConversations, fetchDMThread, sendDM, decryptDM } from "./dms";

src/lib/nostr/social.ts

@@ -82,6 +82,20 @@ export async function fetchMentions(pubkey: string, since: number, limit = 50):
   return Array.from(events).sort((a, b) => (b.created_at ?? 0) - (a.created_at ?? 0));
 }
 
+export async function fetchFollowers(pubkey: string, limit = 200): Promise<string[]> {
+  const instance = getNDK();
+  const events = await fetchWithTimeout(
+    instance,
+    { kinds: [3 as NDKKind], "#p": [pubkey], limit },
+    FEED_TIMEOUT,
+  );
+  const followerPubkeys = new Set<string>();
+  for (const e of events) {
+    if (e.pubkey !== pubkey) followerPubkeys.add(e.pubkey);
+  }
+  return Array.from(followerPubkeys);
+}
+
 export async function fetchNewFollowers(pubkey: string, since: number, limit = 20): Promise<NDKEvent[]> {
   const instance = getNDK();
   const filter: NDKFilter = {

src/lib/notificationPoller.ts

@@ -98,6 +98,7 @@ async function pollOnce(pubkey: string) {
       recentlySeen.add(e.id!);
       const name = await getProfileName(e.pubkey);
       notifyFollower(name).catch(() => {});
+      useNotificationsStore.getState().incrementNewFollowers();
     }
     if (followers.length > 0) ts.followers = now;
   } catch { /* non-critical */ }