Feature: Add 24-hour cleanup for incomplete orders and update status display

- Create cleanupOrders utility to delete pending orders older than 24 hours
- Update admin notifications to only count recent pending orders (< 24h old)
- Automatically call cleanup when customer initiates checkout
- Change status display from "PENDING" to "Waiting payment" for customer-facing views
- Update both customer account page and admin orders page with new status label
- Incomplete orders automatically purged, reducing admin clutter

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

src/app/admin/orders/page.tsx

@@ -7,6 +7,13 @@ function formatPrice(cents: number) {
   return `£${(cents / 100).toFixed(2)}`;
 }
 
+function statusLabel(status: string) {
+  if (status === 'PAID') return 'Confirmed';
+  if (status === 'FAILED') return 'Failed';
+  if (status === 'PENDING') return 'Waiting payment';
+  return 'Processing';
+}
+
 const STATUS_STYLES: Record<string, string> = {
   PAID: 'bg-splash-blue/10 text-splash-blue',
   PENDING: 'bg-splash-orange/10 text-splash-orange',
@@ -121,7 +128,7 @@ export default async function OrdersPage({ searchParams }: { searchParams: { arc
                 )}
                 <span className="font-mono text-sm">{formatPrice(order.total)}</span>
                 <span className={`tag-label rounded-full px-3 py-1 ${STATUS_STYLES[order.status] ?? ''}`}>
-                  {order.status}
+                  {statusLabel(order.status)}
                 </span>
                 <form action={showArchived ? unarchiveOrder : archiveOrder}>
                   <input type="hidden" name="id" value={order.id} />