{{--
    Shared error slot for any host wrapping cart-body in a bbk-cart controller
    instance (the drawer, and the checkout page's own order summary) —
    bbk-cart-controller.js#showError() writes into whichever one is present.
    Without this element in a given host, a rejected quantity update (e.g.
    over stock) still gets rejected server-side, but the shopper never sees
    why.
--}}
<p class="bbk-cart-error" data-bbk-cart-target="error" hidden role="alert"></p>