/** Digits only. Drops a leading 0 or 91 so the same mobile is one customer. */
export function normalizePhone(raw: string): string {
  let d = raw.replace(/\D/g, "");
  if (d.length === 12 && d.startsWith("91")) d = d.slice(2);
  if (d.length === 11 && d.startsWith("0")) d = d.slice(1);
  return d;
}