Style: Match cart footer to wishlist footer layout

Simplified cart dropdown footer to exactly match wishlist layout:
- Removed cart summary (Subtotal display)
- Removed 'Proceed to Checkout' button
- Kept only 'Continue Shopping' button with btn-outline style

Cart and wishlist footers now have identical layout and styling.

Files updated:
- shop.html
- contact.html
- product.html
- about.html

website/public/shop.html

@@ -677,13 +677,6 @@
                   <p class="empty-state">Your cart is empty</p>
                 </div>
                 <div class="dropdown-foot">
-                  <div class="cart-summary">
-                    <span class="summary-label">Subtotal:</span>
-                    <span class="summary-value" id="cartSubtotal">$0.00</span>
-                  </div>
-                  <a href="/checkout" class="btn-outline"
-                    >Proceed to Checkout</a
-                  >
                   <a href="/shop" class="btn-outline">Continue Shopping</a>
                 </div>
               </div>