b94e1aa135
Backend: cache status in RwLock, refresh every 15s via background task. Eliminates per-request TCP race to ElectrumX that caused volatile errors. Fix error classification so "Failed to read" is transient, not hard error. Frontend: keep last-known-good data across failed polls, persist Tor onion once discovered, adaptive polling (5s active / 30s synced). Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>