Add zap history view (roadmap #9)

- fetchZapsReceived: kind 9735 filtered by #p tag (receipts)
- fetchZapsSent: kind 9734 filtered by authors (zap requests)
- ZapHistoryView: Received / Sent tabs with row count; header shows
  total sats in/out; each row: avatar, amount, counterpart name
  (clickable → profile), comment, time ago
- Receipt parsing: amount from embedded zap request in "description"
  tag (millisats → sats); sender from uppercase "P" tag with fallback
  to zap request pubkey
- Request parsing: amount from "amount" tag, recipient from "p" tag
- ⚡ zaps nav item added to sidebar between search and relays
- Logged-out fallback state with prompt to log in

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

src/lib/nostr/client.ts

@@ -305,6 +305,24 @@ export async function publishContactList(pubkeys: string[]): Promise<void> {
   await event.publish();
 }
 
+export async function fetchZapsReceived(pubkey: string, limit = 50): Promise<NDKEvent[]> {
+  const instance = getNDK();
+  const filter: NDKFilter = { kinds: [NDKKind.Zap], "#p": [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 fetchZapsSent(pubkey: string, limit = 50): Promise<NDKEvent[]> {
+  const instance = getNDK();
+  const filter: NDKFilter = { kinds: [NDKKind.ZapRequest], 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 fetchMuteList(pubkey: string): Promise<string[]> {
   const instance = getNDK();
   const filter: NDKFilter = { kinds: [10000 as NDKKind], authors: [pubkey], limit: 1 };

src/lib/nostr/index.ts

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