Add button scroll to description pdp

//Thêm option (main-product.liquid)
{
          "type": "checkbox",
          "id": "show_mehr",
          "label": "Show Mehr erfahren",
          "default": false
        },
==========================================================================
//Show ở file
 <!-- Show Button Mehr erfahren-->
    {%- if section.settings.show_mehr -%}
      <a href="#" class="button btn-mehr">Mehr erfahren</a>
    {%- endif -%}
    <!-- Show Button Mehr erfahren-->
==========================================================================
//js nếu cần (Tùy vào class của desc để custom lại)
document.querySelector('.btn-mehr').addEventListener('click', function(event) {
    event.preventDefault();
    
    const faqWrapper = document.querySelector('.pdp-faq-blog');
    
    if (faqWrapper) {
        const offsetTop = faqWrapper.getBoundingClientRect().top + window.pageYOffset - 100;
        window.scrollTo({ top: offsetTop, behavior: 'smooth' });
        
        const firstFaqItem = faqWrapper.querySelector('.faq__item');
        
        if (firstFaqItem) {
            const collapsibleContent = firstFaqItem.querySelector('collapsible-content');
            if (collapsibleContent && !collapsibleContent.hasAttribute('open')) {
                collapsibleContent.setAttribute('open', '');
                
                const toggleButton = firstFaqItem.querySelector('.collapsible-toggle');
                if (toggleButton) {
                    toggleButton.setAttribute('aria-expanded', 'true');
                }
            }
        }
    }
});