ORD-002: Order Confirmation Page — post-checkout summary with order ID

## Overview
Show a confirmation page immediately after a successful order, displaying the order ID, itemized summary, estimated delivery, and next steps.

## Acceptance Criteria
- [ ] Redirected to confirmation page after checkout success
- [ ] Page shows: order ID, items ordered, subtotal/tax/total, shipping address, estimated delivery
- [ ] 'View Order History' link navigates to ACC-012
- [ ] Email confirmation is triggered (see NOTIF-001)
- [ ] Cart is cleared after confirmation

## Depends On
- #46 (ORD-001 — Order Service: order ID required)

Start with the checkout-success flow and review dependency #46 for the order ID, then check the references to ACC-012 and NOTIF-001. Done means a confirmation page appears after checkout with the listed order details, links to order history, triggers email confirmation, and clears the cart.

Written by the indexing model from the issue text.