fix(zodv4): fixed properties generation for zodv4

[oskarstucki]

This is a fix for issue #1251

[pirate-max]

I was also facing unknown type issues when using the generated zodv4 schemas with the zodResolver from @hookform/resolvers. Adding the change manually to the generated file fixes those issues 👍

[Code-Hex]

Closing this because the Zod v4 Properties typing issue was fixed in #1423, covering both #1251 and the later optional-property report in #1362.

The fix on main is broader than this one-line change. It keeps optional properties behaving correctly in inferred Zod v4 types and has generated TypeScript compile coverage, so merging this branch now would move the code backward.

Thanks for the small focused patch. It pointed at the right broken spot.