SQLite-backed followers cache and instant own-profile load

Followers now load instantly from SQLite on startup, then merge
relay results in background. Own profile name/picture loads from
DB cache so sidebar badge never shows raw npub on slow relays.

src/lib/db.ts

@@ -49,3 +49,16 @@ export function dbMarkNotificationRead(ids: string[]): void {
 export async function dbNewestNotificationTs(ownerPubkey: string, notifType: string): Promise<number | null> {
   return invoke<number | null>("db_newest_notification_ts", { ownerPubkey, notifType }).catch(() => null);
 }
+
+// ── Followers cache ────────────────────────────────────────────────────────
+
+/** Save follower pubkeys to SQLite. Fire-and-forget. */
+export function dbSaveFollowers(followers: string[], ownerPubkey: string): void {
+  if (followers.length === 0) return;
+  invoke("db_save_followers", { followers, ownerPubkey }).catch(() => {});
+}
+
+/** Load cached follower pubkeys for owner. */
+export async function dbLoadFollowers(ownerPubkey: string): Promise<string[]> {
+  return invoke<string[]>("db_load_followers", { ownerPubkey }).catch(() => []);
+}

src/lib/nostr/social.ts

@@ -85,10 +85,11 @@ export async function fetchMentions(pubkey: string, since: number, limit = 50):
 
 export async function fetchFollowers(pubkey: string, limit = 200): Promise<string[]> {
   const instance = getNDK();
+  // #p queries on kind 3 are slow on most relays — give them extra time
   const events = await fetchWithTimeout(
     instance,
     { kinds: [3 as NDKKind], "#p": [pubkey], limit },
-    FEED_TIMEOUT,
+    15000,
   );
   const followerPubkeys = new Set<string>();
   for (const e of events) {