Product-level filtering for purchase completed automations in Reach

The "Purchase completed" trigger in Reach automations now supports product-level filtering. You can choose to apply an automation to all products (the default) or select up to 15 specific products by URL. The system automatically strips domain information when you paste a full store URL, validates URLs from different domains inline, and lets you remove individual products from the list. Your automation flow card displays the scope you've chosen—either "Applies to all products" or the count of specific products configured.