Missing Cleanup in useEffect: Leaking Timers or Event Listeners

I register a window event listener inside useEffect, but never remove it. This causes memory leaks and duplicate behavior when the component unmounts and remounts.

Without cleanup, listeners persist beyond the component lifecycle, leading to memory leaks or duplicated handlers ([turn0search5]turn0search3]). Fix: jsx Copy code useEffect(() => { const onResize = () => { /* logic */ }; window.addEventListener('resize', onResize); return () => window.removeEventListener('resize', onResize); }, []);