export function formatBytes(n: number): string {
  const num = Number(n) || 0;
  if (num < 1024) return `${num} B`;
  const units = ['KiB', 'MiB', 'GiB', 'TiB', 'PiB'];
  let v = num / 1024;
  let i = 0;
  while (v >= 1024 && i < units.length - 1) {
    v /= 1024;
    i++;
  }
  return `${v.toFixed(2)} ${units[i]}`;
}

export function formatDate(s: string | null | undefined): string {
  if (!s) return '—';
  const d = new Date(s);
  if (Number.isNaN(d.getTime())) return '—';
  return d.toLocaleString();
}