feat: add 7702 methods to ledger

[montelaidev]

This PR adds the 7702 methods to the ledger keyring. The method itself is not usable until the dmk support has been added.

Examples

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Note

Medium Risk
Introduces new hardware-backed authorization signing and signature recovery; iframe/mobile paths reject the operation until device support lands, but mistakes in parity or recovery could affect account safety.

Overview
Adds EIP-7702 delegation authorization signing to the Ledger keyring: LedgerKeyring.signEip7702Authorization unlocks the account, calls a new bridge method deviceSignDelegationAuthorization (chainId, contract address without 0x, nonce), normalizes Ledger v to y-parity, and verifies the result with recoverEIP7702Authorization.

The LedgerBridge contract gains delegation sign types and deviceSignDelegationAuthorization. Iframe and mobile bridges implement the method by throwing (not supported on those transports yet; PR notes DMK work is still pending).

Personal sign and EIP-712 paths now use a shared #parseLedgerRecoveryParam so Ledger v values like hex '1b' parse correctly before legacy normalization.

The v2 LedgerKeyring advertises SignEip7702Authorization in account methods (via EthKeyringMethod). Changelog and Jest coverage thresholds are updated; tests cover the new flow and recovery-param edge cases.

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