[@mantine/hooks] Support ref cleanup function in React 19 with useMergedRef #7304
+93
−5
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fixes #7269
useMergedRef now properly handles ref callbacks that return cleanup functions in React 19.
For backward compatibility with React 18, it maintains the previous behavior of calling refs with null during unmount.
I have verified the functionality through a separate test repository, as direct testing within Mantine is not possible due to its React 18 dependency.
https://github.com/elecdeer/react-19-use-merge-ref/blob/main/react19/src/use-merged.ref.test.tsx