wip: solanaSignMessage #770
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Adds solanaSignMessage method to hdwallet-core and implements it in hdwallet-native to support signing raw Solana message bytes. This enables protocols like Bebop that require signing transaction messages for submission to their API (gasless mode). Implementation: - hdwallet-core: Add SolanaSignMessage interface and optional method - hdwallet-native: Implement using adapter's signMessage method - Returns base64-encoded signature Native wallet only for now, other wallets can be added later.
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- Add signMessage method to PhantomSolanaProvider type - Implement solanaSignMessage using Phantom's Ed25519 signing - Returns signature as base64 string (following native wallet pattern) - Enables Bebop gasless Solana swaps with message signing
- Add solanaSignRawTransaction to SolanaWallet interface - Implement in Phantom using provider.signTransaction - Implement in Native using adapter.signTransaction - Returns signature as base64 string - Enables signing prebuilt Bebop transactions
- Native: use adapter.signMessage(messageBytes) - exact equivalent of signBytes - Phantom: add logging to verify message integrity - Both extract tx.messageBytes and sign without modifying transaction
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Allowing arbitrary Solana signing for e.g but not limited to, Bebop gasless solana swaps