Function update

docs/script.js:242–249

()

    let currentIndex = 0;

    const update = () => {
      track.style.transform = `translate3d(-${currentIndex * 100}%, 0, 0)`;
      dots.forEach((dot, index) => {
        const isActive = index === currentIndex;
        dot.classList.toggle("is-active", isActive);
        dot.setAttribute("aria-selected", String(isActive));
      });
    };

    const goTo = (index) => {
      currentIndex = (index + slides.length) % slides.length;