Add OffChainSignature support to eth_signTypedData_v4

[heri16]

Add OffChainSignature support to eth_signTypedData_v4.

---

Note

Adds off-chain signature handling for typed data requests.

• In provider.ts, when sdk.txs.signTypedMessage returns no signature but includes messageHash, fetch and return sdk.safe.getOffChainSignature(messageHash) instead of 0x for eth_signTypedData/eth_signTypedData_v4.

^{Written by Cursor Bugbot for commit cc09d1f. This will update automatically on new commits. Configure here.}

[changeset-bot]

⚠️ No Changeset found

Latest commit: cc09d1f

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

Click here to learn what changesets are, and how to add one.

Click here if you're a maintainer who wants to add a changeset to this PR

[github-actions]

CLA Assistant Lite bot:
Thank you for your submission, we really appreciate it. Like many open-source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution. You can sign the CLA by just posting a Pull Request Comment same as the below format.

---

I have read the CLA Document and I hereby sign the CLA

---

_{You can retrigger this bot by commenting recheck in this Pull Request}