feat: add useDebounce hook for debounced search input

[AliMahmoudDev]

Description

Adds a useDebounce hook that delays updating a value until after a specified delay (default 300ms). Useful for search inputs to reduce API calls.

Usage

const [search, setSearch] = useState('');
const debouncedSearch = useDebounce(search, 300);

useEffect(() => {
  fetchResults(debouncedSearch);
}, [debouncedSearch]);

Addresses #29

[vercel]

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