Export `binary` string OpenAPI types using `z.file()` in zod v4

[ntjess]

Description

Zod 4 now supports z.file() natively, which means OpenAPI specs referencing a Blob | File can have parity between zod/ts generation.

Current behavior is z.string(), which doesn't match the typescript definitions.

Hopefully this is a straightforward task especially if zod 4 is targeted by default.

[mrlubos]

Do you want to open a pull request for this change? You may also want to read #1616 for additional context around this request, it's very similar

[ntjess]

Thanks for linking the context. Indeed, it brings up more considerations than I anticipated around input/output differences. Since my use case would be supported by a successful land of #1616 anyway, I'll wait on this until after the PR is merged.

I appreciate your work on this library! It's definitely the best API generator I've used and I'm excited by the continuous improvements 🙂

[mrlubos]

Appreciate it! Much much more to come!