refactor(useUnmount): defer ref assignment to layout phase for better React lifecycle compliance

[sabertobihwy]

What’s changed

This PR updates the useUnmount hook by moving the funcRef.current = func assignment out of the render phase and into a useIsomorphicLayoutEffect.

Why

Assigning to refs during render is not recommended in React, especially under concurrent or strict mode. It can lead to subtle bugs or mismatches between what React thinks and what actually happens.

By moving this to the layout phase, we ensure the ref is updated safely, and it aligns better with React's lifecycle best practices.

Notes

This change doesn’t alter the behavior of useUnmount — it’s a lifecycle correctness refactor only.

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Latest commit: f923360

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