CAROUSEL

A horizontally-scrolling row of the rich product card (photo/variant slider, favorite heart, discount badge, variant picker — see product-card-data.md), backed by the product query contract.

{
  "type": "CAROUSEL",
  "params": { "category_id": 75, "limit": 10 }
}

params is passed straight to ProductQuery.fromParams, then WidgetCallbacks.fetchProducts(query) supplies the products. Renders nothing while loading resolves to an empty list.

CAROUSEL, GRID, PRODUCTCARD and FLASHSALE's product sheet all render the exact same rich card — CAROUSEL just lays it out in a horizontal row instead of a grid.