/**
 * Ensure a DiceBear avatar URL uses PNG format for React Native compatibility.
 * React Native's Image component cannot render SVGs.
 * This converts at render time only — the stored URL in the DB is never modified.
 */
export function ensurePngAvatar(url: string | null | undefined): string | undefined {
  if (!url) return undefined;
  return url.replace('/svg?', '/png?');
}