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export function useFetch<T>(url: string) {
  const [data, setData] = useState<T | null>(null);
  const [error, setError] = useState<Error | null>(null);
  const [loading, setLoading] = useState(true);

  useEffect(() => {
    const abortController = new AbortController();
    const fetchData = async () => {
      try {
        const res = await fetch(url, { signal: abortController.signal });
        if (!res.ok) throw new Error('Failed to fetch data');
        setData(await res.json());
      ...