[ACC-012] Accounts: Order history & order detail view

## Overview
Give users visibility into their past orders. This is one of the most-requested features in post-purchase UX and directly impacts customer trust and support load reduction.

## Acceptance Criteria
- [ ] `/account/orders` lists all orders with: order ID, date, status, item count, and total
- [ ] Status badge is color-coded: confirmed (blue), processing (yellow), shipped (purple), delivered (green)
- [ ] `/account/orders/:orderId` shows full order detail: items, prices, discounts, shipping address, tracking number (placeholder)
- [ ] Pagination: 10 orders per page with "Load more" or page controls
- [ ] Filter by status and date range
- [ ] "Reorder" button — adds all items from a past order to the cart
- [ ] "Review Items" CTA for delivered orders links to review flow (#20)
- [ ] "Return Items" CTA for delivered orders links to returns portal (#18)

## ⚠️ Status: Blocked
This feature has a hard dependency on both the order service (#14) and user authentication (#5). If either is delayed, this ticket cannot ship.

## Depends On
- #14 ORD-001 — provides the order data API
- #5 AUTH-001 — page is gated behind authentication

## Blocks
- #18 OPS-009 (returns portal is linked from order history)