Incorrect types in `useControlled` util

[jjenzz]

Bug report

Current behavior

Note how I haven't defined a default value for any of the props below:

function Popup({ open: openProp, defaultOpen, onOpenChange }) {
  const [open, setOpen] = useControlled({
    controlled: openProp,
    default: defaultOpen,
    // ...
  })
}

When we have an example like this where the types are a union of undefined, the above example excludes undefined from the types so open is boolean when it should be undefined.

Expected behavior

I expected the type system to correctly reflect that open could be undefined here.

Reproducible example

https://stackblitz.com/edit/vitejs-vite-drsu38kk?file=src%2FApp.tsx

Base UI version

Utils version 0.3.1

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Which assistive tech are you using (if applicable)?

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