Configurable Nostr sync; fully reconcile wallet state on load

Device sync:
- Add a "Device sync" settings card: toggle (on by default) + editable
  relay list (defaults to wss://relay.coinos.io). When off, the wallet
  never contacts a relay. nostr.js is now multi-relay and reads an
  enabled/relays preference from localStorage.

Reconciliation (fixes a stray "payment received" + stale history on
import, especially via the Nostr/cache load path):
- Always full-scan on load instead of a frontier-only refreshLive, so
  balance, history confirmations and spends are reconciled and the
  celebration baselines against everything that already exists (cache/
  Nostr still shows instantly first).
- Actually start the periodic full-scan safety net (_deepTimer, 2 min);
  it was declared but never wired up.
- WS pushes now refresh an existing tx's pending→confirmed status, not
  only add new transactions.

Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>

0 files changed, 0 insertions, 0 deletions