Completes todo #15. On login, if an encrypted copy of the user's storage and/or
wallet settings exists on their Nostr account — and this device hasn't already
opted in — offer to restore it.
- js/nostr/encryptedSync.js: exists(dTag) — cheap list-only existence peek (NO
decrypt, so it doesn't spend the signer budget); decryption only on accept.
- storage/walletSyncService: hasRemote() wrappers over exists().
- js/services/settingsRestorePrompt.js: one-time per-pubkey offer. Only prompts
for items with a remote copy not already enabled locally; if nothing remote
exists it does NOT consume the one-time offer (a note published later can still
prompt next login). On accept, pulls + applies.
- app.js handleLoginModalSuccess: fires maybeOfferSettingsRestore(pubkey) after
login, deferred ~2s so relays connect; best-effort, never blocks login; toasts
on restore.
tests/settings-restore-prompt.test.mjs: offer+restore-only-remote-items, decline,
prompt-once, skip-already-enabled, don't-consume-when-empty. Mutation-verified.
Co-Authored-By: Claude Opus 4.8 <[email protected]>
