compat: Improve React compatibility for Ref type.

[maxbrieiev]

In React, the Ref type corresponds to the Ref type in preact core. However, preact/compat re-exports the Ref type from preact/hooks instead of from core.

The following snippet does not produce a type error in React, but it does when using preact:

export const baz = (
  ref: React.ForwardedRef<HTMLElement>
): React.Ref<HTMLElement> => ref;

In preact it producesType 'ForwardedRef<HTMLElement>' is not assignable to type 'Ref<HTMLElement>'.

This pull requests fixes this issue.

[coveralls]

coverage: 99.611%. remained the same
when pulling 92fd386 on maxbrieiev:main
into d19017e on preactjs:main.

[rschristian]

Cheers, thanks for going beyond too! It'll hopefully correct similar mismatches in the future.