eCommerce Infinite Scroll

When this module is installed, the product list on the /shop page no longer shows page numbers. Instead, as a visitor scrolls down, the next batch of products is loaded automatically and appended to the list, so browsing feels continuous.

• A "back to top" button appears while scrolling down and hides again when clicked.
• A loading image (preloader) is displayed while the next products are being fetched. The default is a standard spinner, and you can replace it in Settings > Website with your own image.
• The number of products loaded per batch follows the shop's existing "products per page" setting.
• The module adds a setting field on the website configuration screen to upload the preloader image, and stores it on the website record.
• It touches the website configuration (res.config.settings), the website itself (website), and the shop controller that renders the product grid (website_sale.products).
• When a visitor scrolls past the last available products, an empty response is returned and no further loading happens.

This only affects the shop product listing; product pages, categories and search results keep their normal behaviour.