export function formatSize(bytes: number): string {
  if (bytes <= 0) return "";
  const units = ["B", "KB", "MB", "GB"];
  let i = 0;
  let n = bytes;
  for (; n >= 1024 && i < units.length - 1; i++) n /= 1024;
  return `${n >= 10 || i === 0 ? Math.round(n) : n.toFixed(1)} ${units[i]}`;
}