Reject sign exact solana tx in sign msg request#1152
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This pull request introduces a safeguard in the Solana signer to prevent signing serialized transactions through the sign_message interface, ensuring stricter validation via new is_transaction_bytes and try_decode_transaction_bytes functions. It also refactors the MessageSigner to utilize GemChainSigner for Base58 signing. Feedback was provided regarding a security risk where calling .to_vec() on private keys creates non-zeroized copies in memory, potentially exposing sensitive data.
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