/** Formats a token count for compact human-facing status text. */
export function formatTokenCount(value?: number): string {
  if (value === undefined || !Number.isFinite(value)) {
    return "0";
  }
  const safe = Math.max(0, value);
  if (safe >= 1_000_000) {
    return `${(safe / 1_000_000).toFixed(1)}m`;
  }
  if (safe >= 1_000) {
    const precision = safe >= 10_000 ? 0 : 1;
    const formattedThousands = (safe / 1_000).toFixed(precision);
    if (Number(formattedThousands) >= 1_000) {
      return `${(safe / 1_000_000).toFixed(1)}m`;
    }
    return `${formattedThousands}k`;
  }
  return String(Math.round(safe));
}