KarpelesLab / libwallet / 24416744321

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webview injection: EIP-6963, Solana Wallet Standard, mpurse

New endpoint `Web3:injectionScript` returns a JS blob the host app can
run inside a WebView to expose libwallet as:

- `window.ethereum` — EIP-1193 provider, EIP-6963 announce with
  wallet name / icon / rdns / uuid baked into the script. Covers all
  configured EVM chains.
- `window.solana` — legacy provider + minimal Wallet Standard
  `wallet-standard:register-wallet` announce. Solana mainnet/devnet.
- `window.mpurse` — Monacoin (github.com/tadajam/mpurse). `getAddress()`
  drives a connect prompt and returns the connected account address;
  `signMessage` / `signRawTransaction` / `sendRawTransaction` / `sendAsset`
  return "not implemented yet" so dApps load cleanly and can fall back.

The script works bidirectionally: dApp calls go out through a
host-provided bridge channel (name is configurable via `Bridge`), and
host events drive the provider back via a `__libwalletEvent(name, data)`
entry point that re-dispatches per standard (EIP-1193 emit, mpurse
updateEmitter, Solana connect/disconnect).

Initial state (chainId, networkVersion, connected accounts for the
given `Host`) is baked into the script so providers answer on first
paint without a host round-trip.

Dart helper: `client.web3.injectionScript(name:, rdns:, uuid:, icon:,
bridge:, host?:)` returns the ready-to-run JS string.

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

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