KarpelesLab / libwallet / 24419426170

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mpurse: signRawTransaction + sendRawTransaction

`window.mpurse.signRawTransaction(hex)` now works end-to-end for
bitcoin-family chains. The dApp hands us an unsigned raw transaction;
we identify which inputs belong to the user's xpub tree, derive the
per-input TSS signers at the right child path, and return the signed
hex.

- New `wlttx.SignRawBitcoinTx`: parses the hex with
  `outscript.BtcTx.UnmarshalBinary`, scans both m/0 and m/1 with
  `modchain_lookupTxoBIP32` to build an ownership map, matches each
  input by (txid:vout), and signs via the existing
  `newBtcInputSigner` (which threads the account IL + per-child IL
  through the wallet's TSS signer). Sighash: SIGHASH_ALL on BTC/LTC/
  DOGE/MONA, SIGHASH_ALL|SIGHASH_FORKID on bitcoin-cash.

- v1 is strict: all inputs must be owned by this account. Errors out
  otherwise. Covers the Counterparty / mpurse happy path (every input
  is the user's). Partial-sign multi-party flows can come later.

- Routed through the approval flow as a new
  `mpurse_sign_transaction` request type; user approves with keys,
  approve handler calls SignRawBitcoinTx.

- `window.mpurse.sendRawTransaction(hex)` is a direct pass-through to
  the current network's `sendrawtransaction` RPC — no approval needed
  (tx is already signed).

- `mpurse_sendAsset` still errors: Counterparty tx construction
  depends on an external service; dApps should build via counterparty
  and then call sign+send.

Dart:
- New `MpurseSignTransactionRequest` subtype in the sealed hierarchy,
  with `unsignedTxHex` / `signedTxHex` getters.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

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