fix: Generate EIP-712 messages for active chain id

[cgero-eth]

The domain.chainId attribute of the EIP-712 messages should match the current active chain of the client as specified on the EIP-712 spec:

uint256 chainId the EIP-155 chain id. The user-agent should refuse signing if it does not match the currently active chain.

The Wagmi library for instance throws an error when the chainId specified on the EIP-712 message does not match the current active chain (see code here).

• Update the EIP-712 message example to set the correct domain.chainId attribute for the active chain

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