Function toggle

e2e/viewer/src/SessionPlayer.tsx:232–240

()

  };

  const toggle = async () => {
    const next = !playing;
    setPlaying(next);
    if (next && tRef.current >= duration - 0.1) {
      tRef.current = 0;
      setT(0);
    }
    await apply(tRef.current, next);
  };

  // Live URL: the last main-frame navigation at-or-before "now" (wall).
  const wallNow = sessionStart + t * 1000;