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

app/koszyk/page.tsx

@@ -4,6 +4,8 @@ import { useCartStore } from '@/lib/cart-store';
 import Image from 'next/image';
 import Link from 'next/link';
 import { Trash2, Plus, Minus, ShoppingBag, ArrowRight } from 'lucide-react';
+import { buttonClasses } from '@/components/ui/Button';
+
 
 export default function KoszykPage() {
   const { items, removeItem, updateQuantity, getTotal, clearCart } = useCartStore();
@@ -14,9 +16,9 @@ export default function KoszykPage() {
       <main className="min-h-screen bg-slate-50 flex items-center justify-center">
         <div className="text-center">
           <ShoppingBag className="size-16 text-border mx-auto mb-4" />
-          <h1 className="text-2xl font-bold text-primary font-heading mb-2">Koszyk jest pusty</h1>
+          <h2 className="text-2xl font-bold text-primary font-heading mb-2">Koszyk jest pusty</h2>
           <p className="text-text-muted mb-6">Dodaj produkty ze sklepu aby złożyć zamówienie.</p>
-          <Link href="/sklep" className="btn btn-primary text-white font-bold">
+          <Link href="/sklep" className={buttonClasses({ variant: 'primary', size: 'md' })}>
 Przejdź do sklepu
 </Link>
         </div>