/** Short, URL-safe random ids (10 chars, ~60 bits). Works in browsers and Node. */
export function newId(): string {
  const bytes = new Uint8Array(8);
  crypto.getRandomValues(bytes);
  let id = '';
  for (const b of bytes) id += b.toString(36).padStart(2, '0');
  return id.slice(0, 10);
}