Add wishlist button to cart page's related-products cards

RelatedProducts.tsx was the only product-card grid missing the
WishlistButton (ProductGrid.tsx/ProductSpotlight.tsx already had it).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

app/cart/page.tsx

@@ -4,7 +4,7 @@ import { CartContent } from "./components/CartContent";
 import { RelatedProducts } from "./components/RelatedProducts";
 import { TrustRow } from "../components/TrustRow";
 import { Footer } from "../components/Footer";
-import { getCartTrustBadges, getShippingMethods, getShippingSettings, getDefaultTaxRatePercent, getKleinunternehmer } from "../lib/payload";
+import { getCartTrustBadges, getShippingMethods, getShippingSettings, getDefaultTaxRatePercent, getKleinunternehmer, getWishlistEnabled } from "../lib/payload";
 import { hasActiveDiscountCode } from "../lib/discountServer";
 
 // robots: noindex — transactional page (mirrors a specific shopper's cart
@@ -20,13 +20,14 @@ export const metadata: Metadata = {
 };
 
 export default async function CartPage() {
-  const [trustBadges, shippingMethods, shipping, defaultTaxRate, kleinunternehmer, showDiscountField] = await Promise.all([
+  const [trustBadges, shippingMethods, shipping, defaultTaxRate, kleinunternehmer, showDiscountField, wishlistEnabled] = await Promise.all([
     getCartTrustBadges(),
     getShippingMethods(),
     getShippingSettings(),
     getDefaultTaxRatePercent(),
     getKleinunternehmer(),
     hasActiveDiscountCode(),
+    getWishlistEnabled(),
   ]);
 
   // The cart doesn't ask which shipping method the shopper wants yet
@@ -60,7 +61,7 @@ export default async function CartPage() {
             showDiscountField={showDiscountField}
           />
         </Suspense>
-        <RelatedProducts defaultTaxRate={defaultTaxRate} kleinunternehmer={kleinunternehmer} />
+        <RelatedProducts defaultTaxRate={defaultTaxRate} kleinunternehmer={kleinunternehmer} wishlistEnabled={wishlistEnabled} />
         <TrustRow />
       </main>
       <Footer />