Cart: use the shared ProductBadge (was missing "Neu")

CartContent.tsx had its own fourth independent discount-badge
implementation, never updated for Products.badge — "Neu" showed on the
PDP and shop grid but not here.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_013Eg6h91yngXmSnM51wxXM8

app/cart/components/CartContent.tsx

@@ -15,6 +15,7 @@ import { VersandModal } from "../../components/VersandModal";
 import { VatBreakdown } from "../../components/VatBreakdown";
 import { ArrowLeftIcon } from "../../components/ArrowLeftIcon";
 import { ProductName } from "../../components/ProductName";
+import { ProductBadge } from "../../components/ProductBadge";
 import { FreeShippingBanner } from "./FreeShippingBanner";
 import type { TrustBadge, ShippingSettings } from "../../lib/payload";
 
@@ -248,11 +249,9 @@ export function CartContent({
                         className="object-cover"
                       />
                     )}
-                    {discount !== null && (
-                      <span className="absolute top-2 left-2 rounded-full bg-brand px-2 py-0.5 text-label font-bold text-text-primary">
-                        -{discount}%
-                      </span>
-                    )}
+                    <div className="absolute top-2 left-2">
+                      <ProductBadge product={product} />
+                    </div>
                   </div>
                   <div className="flex flex-col gap-[0.625rem] items-start flex-1 min-w-0 w-full">
                     {product.href ? (