UI enhancements

[alvyynm]

I've noted the following UI issues:

• [x] single product detail page featured image has no radius
• [x] product card distorted when the product name is longer than a certain length
• [x] there are two shopping carts visible on small screens
• [x] cart items don't have appropriate category color codes
• [x] cart button don't display no. of items in the cart, when available