// URL publica del bucket 'materiales-fotos' a partir del path guardado.
export function imgUrl(path?: string | null): string | null {
  if (!path) return null;
  const base =
    (import.meta.env.PUBLIC_SUPABASE_URL as string | undefined) ??
    (process.env.PUBLIC_SUPABASE_URL as string | undefined);
  if (!base) return null;
  return `${base}/storage/v1/object/public/materiales-fotos/${path}`;
}