Create a Shop by Category grid section with 8 category tiles in a 4-column layout (2 rows of 4). Each tile has a full background image with text and a "Shop Now" button overlaid directly on the image at the bottom. Behind the text and button add a dark gradient scrim (bottom to transparent) so text is readable. The category title should be white, bold, centered. The Shop Now button should have a frosted glassmorphism style — semi-transparent white background, backdrop-filter blur, white border, white text. On mobile stack to 2 columns. Each tile should be linkable to a collection URL. Image should be customizable per tile through theme editor settings. Clean, modern, premium beverage brand aesthetic.