Change the type of refs for react 19

[elee1766]

see https://react.dev/blog/2024/04/25/react-19-upgrade-guide#useref-requires-argument

so now
MutableRef is now deprecated in favor of a single RefObject type which useRef will always return:

interface RefObject<T> {
  current: T
}

declare function useRef<T>: RefObject<T>

and
useRef still has a convenience overload for useRef<T>(null) that automatically returns RefObject<T | null>. To ease migration due to the required argument for useRef, a convenience overload for useRef(undefined) was added that automatically returns RefObject<T | undefined>.

so i think a change like this is correct? i think it fixes #663 as well

[changeset-bot]

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