useLocalStorage Hook

import { useState } from 'react';
export function useLocalStorage(key, initial) {
  const [stored, setStored] = useState(() => {
    if (typeof window === 'undefined') return initial;
    try { return JSON.parse(localStorage.getItem(key)) || initial; }
    catch { return initial; }
  });
  const setValue = (value) => {
    setStored(value);
    localStorage.setItem(key, JSON.stringify(value));
  };
  return [stored, setValue];
}