Add Sticky “Book Now” Button to Product Pages

Feature: Add a sticky “Book Now” button that remains visible as users scroll down the product page — similar to the default Shopify “sticky add to cart” functionality. Purpose: Improve visibility and accessibility of the booking call-to-action Encourage conversions, especially on mobile devices Provide a better user experience by reducing the need to scroll back up Preferred Behaviour: Button should appear once the user scrolls past the top section It should link directly to the booking app widget (Appointo) or scroll to the booking section Clean and non-intrusive design, aligned with our current theme