Adds a 'Double-tweak SP Fix' option that rescues silent payments stranded
on-chain by the historical double-tweak bug, where outputs landed at
Q = taproot_tweak(P_k) instead of P_k and were invisible to the normal
scanner.
- recovery.ts: scans indexer tweaks for taproot_tweak(P_k) candidates,
matches them against the block UTXO set, and builds/signs a sweep that
spends them with taprootTweakPrivKey(b_spend + t_k).
- useHdWalletDoubleTweakRecovery: in-memory range scan + match reporting,
no NIP-78 persistence (recovered coins are swept immediately).
- WalletDoubleTweakFixPage at /wallet/double-tweak-fix: scan controls,
recoverable total, and a one-tap sweep into a fresh BIP-86 address.
- Wired into the legacy recovery hub and AppRouter.
English strings only; other locales fall back to English at runtime.
Alex Gleason
7927b9806b