Antigravity [ Crypto ] Fix cross-chain replay attack in CrossChainBridge

[Ishant5436]

Resolves #920

This PR fixes the cross-chain replay attack by:

1. Adding a mapping per sender.
2. Modifying to track the target chain nonce.
3. Constructing an EIP-712 Domain Separator with and to prevent cross-chain and post-upgrade replays.
4. Structurally signing the transfer with the source sender's specific target nonce.
5. Explicitly checking for to prevent invalid signature bypass.
6. Including the required .

[github-actions]

Unfortunately the changes in this PR didn't fully resolve the issue. Please rework your solution and submit a new pull request.

Make sure to review the acceptance criteria in the linked issue and verify all conditions are met before resubmitting. See CONTRIBUTING.md for guidelines.