Fix heading structure (H1-H6) and button layouts, add noindex to cart and order pages

app/porownaj/page.tsx

@@ -5,6 +5,8 @@ import Image from 'next/image';
 import Link from 'next/link';
 import { X, ShoppingCart } from 'lucide-react';
 import { useCartStore } from '@/lib/cart-store';
+import { buttonClasses } from '@/components/ui/Button';
+
 
 export default function PorownajPage() {
   const { items, removeItem } = useCompareStore();
@@ -15,7 +17,7 @@ export default function PorownajPage() {
       <main className="min-h-screen bg-slate-50 flex items-center justify-center">
         <div className="text-center">
           <p className="text-text-muted mb-4">Nie masz żadnych produktów do porównania.</p>
-          <Link href="/sklep" className="btn btn-primary text-white font-bold">
+          <Link href="/sklep" className={buttonClasses({ variant: 'primary', size: 'md' })}>
 Wróć do sklepu
 </Link>
         </div>