/**
 * Render a byte count as a short, human-readable size (e.g. `512 B`, `2 KB`,
 * `3.5 MB`, `2.0 GB`). Non-finite or non-positive inputs yield an empty string
 * so callers can treat "no usable size" uniformly.
 */
export function formatBytes(bytes: number): string {
  if (!Number.isFinite(bytes) || bytes <= 0) return '';
  if (bytes < 1024) return `${bytes} B`;
  const kb = bytes / 1024;
  if (kb < 1024) return `${Math.round(kb)} KB`;
  const mb = kb / 1024;
  if (mb < 1024) return mb < 10 ? `${mb.toFixed(1)} MB` : `${Math.round(mb)} MB`;
  const gb = mb / 1024;
  return gb < 10 ? `${gb.toFixed(1)} GB` : `${Math.round(gb)} GB`;
}