Fix the second "Weiter einkaufen" arrow (cart with items) missed earlier

The previous replace_all only matched the empty-cart instance's exact
indentation — this one, inside the has-items branch, was a level
deeper and kept the raw Unicode "←" (aria-hidden), still hitting the
mobile font-fallback vertical-metrics bug ArrowLeftIcon.tsx exists to
avoid.

app/cart/components/CartContent.tsx

@@ -303,7 +303,7 @@ export function CartContent({
               href="/shop"
               className="flex gap-2 items-center text-text-primary hover:text-brand transition-colors"
             >
-              <span aria-hidden>←</span>
+              <ArrowLeftIcon />
               <span className="font-bold text-body-sm">Weiter einkaufen</span>
             </Link>
           </Reveal>