Checkout Summary Panel

A white checkout summary. The header shows the item count on the right of Order summary. Each item starts with an initials tile, then two lines: the name and line total, then the variant with an inline quantity stepper. Apply replaces the promo field with a code chip and adds a Discount row. Changing a quantity rolls the amounts; an invalid code shakes the field. The × on a row fades and collapses that item. Swap the items and codes, then drop it into a store cart or an order review step.