SQLite-backed notifications, WoT profile fix, reaction queue fix

Notifications now load instantly from SQLite on startup instead of
waiting for relay responses. New events merge in as they arrive.
Read state persists in DB across restarts.

Also: filter profile owner from WoT followers list, make "+N more"
clickable to expand, fix reaction throttle queue jamming on errors.

src/hooks/useReactions.ts

@@ -24,12 +24,18 @@ function throttledFetch(eventId: string, pubkey?: string): Promise<GroupedReacti
   const promise = new Promise<GroupedReactions>((resolve) => {
     const doFetch = () => {
       activeCount++;
-      fetchReactions(eventId, pubkey).then((result) => {
-        activeCount--;
-        pending.delete(eventId);
-        resolve(result);
-        runNext();
-      });
+      fetchReactions(eventId, pubkey)
+        .then((result) => {
+          resolve(result);
+        })
+        .catch(() => {
+          resolve({ groups: new Map(), myReactions: new Set(), total: 0 });
+        })
+        .finally(() => {
+          activeCount--;
+          pending.delete(eventId);
+          runNext();
+        });
     };
 
     if (activeCount < MAX_CONCURRENT) {