fix: improve offline sync with better tracking and logging

- Track events explicitly when created in offline mode
- Mark highlights as offline-created when isLocalOnly is true
- Add extensive debug logging throughout sync process
- Increase query timeout from 5s to 10s for better reliability
- Add 2-second delay before syncing to allow relays to connect
- Log relay state transitions and event counts
- Log each event received during sync query
- Should help diagnose and fix offline sync issues

src/hooks/useOfflineSync.ts

@@ -48,7 +48,17 @@ export function useOfflineSync({
 
     if (wasLocalOnly && isNowOnline) {
       console.log('✈️ Detected transition: Flight Mode → Online')
-      syncLocalEventsToRemote(relayPool, account)
+      console.log('📊 Relay state:', {
+        connectedRelays: connectedRelays.length,
+        remoteRelays: connectedRelays.filter(r => !isLocalRelay(r.url)).length,
+        localRelays: connectedRelays.filter(r => isLocalRelay(r.url)).length
+      })
+      
+      // Wait a moment for relays to fully establish connections
+      setTimeout(() => {
+        console.log('🚀 Starting sync after delay...')
+        syncLocalEventsToRemote(relayPool, account)
+      }, 2000)
     }
 
     previousStateRef.current.hasRemoteRelays = hasRemoteRelays