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When the user adds an item to their cart, the primary button transitions from a loading spinner to a success state displaying 'Added to cart' with a checkmark. Simultaneously, a floating cart bar slides up from the bottom of the screen, presenting the shop's branding, item count, and a direct 'Go to checkout' button. After a short delay, the primary button smoothly transitions back to its default 'Add to cart' state, allowing the user to continue shopping while keeping the checkout option easily accessible.
