ABANDONEDCART

A "you left items in your cart" card: the same product query contract as BUNDLE/CAROUSEL (typically the backend's current cart/reservation contents), rendered as a horizontally-scrolling row of product tiles under an optional reservation countdown, with a single CTA button that resolves through the shared action contract — usually back to the cart or checkout screen.

{
  "type": "ABANDONEDCART",
  "params": {
    "cart_id": 42,
    "title": "You left items in your cart",
    "end_time": 1782000000,
    "goto": "cart"
  }
}

• title — header above the row. Falls back to theme.abandonedCartTitleLabel ("You left items in your cart").
• end_time — a Unix timestamp in seconds, or an ISO-8601 string. When set, a countdown ("Reserved for 09:58") renders under the title and the widget hides itself entirely once it passes, matching COUPON/FLASHSALE. Omit it for a reservation with no expiry.
• Every other field is forwarded to ProductQuery.fromParams (see product-query.md) to fetch the cart's products, and to WidgetAction.fromParams (see action-contract.md) to resolve the CTA button's tap target.
• Hides itself entirely when the fetched product list is empty.