export function uuidv4(): string {
  const cryptoObj =
    typeof globalThis !== 'undefined' && (globalThis as { crypto?: Crypto }).crypto
      ? (globalThis as { crypto: Crypto }).crypto
      : undefined;
  if (cryptoObj && typeof cryptoObj.randomUUID === 'function') {
    return cryptoObj.randomUUID();
  }
  // Fallback
  return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, (c) => {
    const r = (Math.random() * 16) | 0;
    const v = c === 'x' ? r : (r & 0x3) | 0x8;
    return v.toString(16);
  });
}