/** Human-readable byte size (B / KB / MB) for document storage figures. */
export function formatBytes(bytes: number | undefined): string {
  const b = bytes ?? 0;
  if (b < 1024) return `${b} B`;
  if (b < 1024 * 1024) return `${(b / 1024).toFixed(1)} KB`;
  return `${(b / (1024 * 1024)).toFixed(1)} MB`;
}