Add menu item customization/detail pages and configurable currency formatting

Lets customers pick options on a menu item detail page before adding to the
basket, and makes displayed prices respect a configurable currency/locale
via VITE_CURRENCY/VITE_LOCALE. Also crossfades the basket's empty/filled
states with AnimatePresence in wait mode instead of animating both at once.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/components/orders/OrdersListView.tsx

@@ -1,6 +1,7 @@
 import { Link } from '@tanstack/react-router'
 
 import type { CustomerOrderSummary } from '#/domain/ordering.ts'
+import { formatPrice } from '#/lib/format.ts'
 
 import styles from './OrdersListView.module.scss'
 
@@ -8,8 +9,6 @@ type OrdersListViewProps = {
   orders: Array<CustomerOrderSummary>
 }
 
-const formatPrice = (cents: number) => `$${(cents / 100).toFixed(2)}`
-
 const formatItems = (items: CustomerOrderSummary['items']) =>
   items
     .map(({ menuItemName, quantity }) =>