fix(antd): Prevent unsaved dialog on modal form submission

[zackseal89]

Addresses issue #6833.

When warnWhenUnsavedChanges is true and a form within a modal (using useModalForm) is dirty, submitting the form could incorrectly trigger the "unsaved changes" confirmation dialog.

This was due to a race condition where the modal closing/unmounting process initiated navigation/unload checks before React had fully processed the warnWhen state update to false (which is set synchronously in the core useForm's onFinish handler).

The fix involves modifying the onFinish handler within packages/antd/src/hooks/form/useModalForm/useModalForm.ts. The modal's close() call is now wrapped in setTimeout(..., 0) to defer its execution to the next event loop cycle. This allows React sufficient time to process the setWarnWhen(false) state update, ensuring that warnWhen is correctly false when the modal close/unmount events trigger any navigation checks.

A new unit test has been added to useModalForm's spec file to verify this fix and prevent regressions.

Manual end-to-end testing of this change in an example application was unfortunately blocked by unrelated build failures in @refinedev/core and @refinedev/antd packages, and subsequent tooling instability related to pre-commit hooks. The fix is verified at the unit test level.

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[alicanerdurmaz]

The code and explanation don’t match the issue, and I couldn’t reproduce the bug either.

I’m closing the PR for now. We’d really appreciate it if you could open a new issue with a reproducible example.