How do you handle authentication state? Authentication state कैसे handle करें?

// Authentication context
const AuthContext = createContext();

function AuthProvider({ children }) {
  const [auth, setAuth] = useState(null);
  
  const login = async (email, password) => {
    const response = await fetch('/api/login', {
      method: 'POST',
      body: JSON.stringify({ email, password })
    });
    const data = await response.json();
    setAuth(data);
    localStorage.setItem('token', data.token);
  };
  
  const logout = () => {
    setAuth(null);
    localStorage.removeItem('token');
  };
  
  return (
    <AuthContext.Provider value={{ auth, login, logout }}>
      {children}
    </AuthContext.Provider>
  );
}