Refactor USD class transfer to use EIP-712 signing #148
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Replace the old SpotUser/ClassTransfer implementation with a new UsdClassTransfer action that uses proper EIP-712 typed data signing. This aligns with the Hyperliquid API's expected signature format, aswell as keeping alignment with hyperliquid-python-sdk. Key changes: - Add UsdClassTransfer struct with EIP-712 implementation - Remove deprecated SpotUser and ClassTransfer structs - Update usd_class_transfer() to use sign_typed_data instead of sign_l1_action - Handle vault_address properly (set to None for usdClassTransfer actions) - Support subaccount suffix in amount string for vault transfers - Add comprehensive tests for signing with mainnet/testnet and vault scenarios
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Replace the old SpotUser/ClassTransfer implementation with a new UsdClassTransfer action that uses proper EIP-712 typed data signing. This aligns with the Hyperliquid API's expected signature format, aswell as keeping alignment with hyperliquid-python-sdk.
Key changes: