Missing page: Checkout (/checkout)

Problem

The /checkout route is not implemented in the application. When users try to navigate to /checkout, they see an empty page with a console warning: "No routes matched location '/checkout'"

Expected Behavior

Users should be able to complete their purchase through a checkout page that includes:

• Order summary with items from cart
• Shipping information form
• Payment method selection
• Order total with tax and shipping
• Confirmation and submit order button

Current Behavior

• Navigation to /checkout shows an empty page
• Console warning: "No routes matched location '/checkout'"
• Footer links to "Checkout" use placeholder "#" href

Acceptance Criteria

• Create /checkout route in React Router
• Implement Checkout component with multi-step form
• Display order summary from cart
• Add shipping address form fields
• Add payment information section (can be placeholder for demo)
• Calculate and display order total
• Implement form validation
• Add "Place Order" button
• Redirect to order confirmation after successful checkout
• Update navigation/footer links to point to /checkout

Priority

High - Required for completing the purchase flow

Start by locating the React Router configuration, cart data used for order summaries, and the footer links that currently use #. Trace how existing forms and navigation work before planning the checkout flow. Done means /checkout supports the listed form, validation, totals, order submission, confirmation redirect, and updated links.