Function login

ui/node-react/client/src/api.js:16–25

(email, password)

// Auth
export async function login(email, password) {
  const res = await fetch(`${API_BASE}/auth/login`, {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({ email, password }),
  });
  const data = await res.json();
  if (!res.ok) throw new Error(data.error || 'Login failed');
  return data;
}

export async function register(email, password) {
  const res = await fetch(`${API_BASE}/auth/register`, {