Function summarizeMotion

packages/cli/src/commands/keyframes.ts:490–505

(tweens: SurfacedTween[], sel: string)

// or orbit returning to its start — still reveals its travel instead of reading
// static (0→0).
function summarizeMotion(tweens: SurfacedTween[], sel: string): string {
  const ranges = new Map<string, { min: number; max: number }>();
  const kfs = tweens
    .filter((t) => t.target === sel && t.method !== "set")
    .flatMap((t) => t.keyframes);
  for (const kf of kfs) {
    for (const [k, v] of Object.entries(kf.properties)) {
      const n = num(v);
      if (n !== null) bumpRange(ranges, k, n);
    }
  }
  const varying = [...ranges.entries()]
    .filter(([, r]) => r.max - r.min > 0.5)
    .map(([k, r]) => `${k} ${Math.round(r.min)}..${Math.round(r.max)}`);
  return varying.length ? varying.join(", ") : "(static)";
}

function bumpRange(ranges: Map<string, { min: number; max: number }>, k: string, n: number): void {
  const r = ranges.get(k);