PDP breadcrumbs: read the real product name instead of hardcoded copy

der-eine's breadcrumb hardcoded "Der Eine" — missing the trailing period
its own headline/pricing card already style in brand color. Switched all
three PDP breadcrumbs to the actual product.name via ProductName so they
can't drift from the real title again.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01J1Hu5bZ1kZUgKhab6yNwCt

app/tasse-die-pause/components/Hero.tsx

@@ -41,7 +41,7 @@ export async function Hero() {
               Werkzeuge
             </Link>
             <span>›</span>
-            <span className="text-text-primary">{product?.name ?? "Tasse"}</span>
+            <span className="text-text-primary">{product ? <ProductName name={product.name} /> : "Tasse"}</span>
           </p>
 
           <div className="flex flex-col gap-6 items-start w-full flex-1 lg:justify-center">