- Added Checkout and Payment pages to handle user authentication and order processing.
- Introduced MockPayPalButton for simulating payment during development.
- Updated CartSheet and CartSidebar components to navigate to the new checkout page.
- Enhanced Cart UI with responsive design for mobile and desktop views.
- Implemented order confirmation and success pages to provide feedback after payment completion.
These changes complete the checkout and payment functionality, improving the overall user experience and ensuring a seamless transition from cart to order confirmation.