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>

.claude/settings.local.json

@@ -88,7 +88,8 @@
       "Bash(git commit -m 'Add: Prominent '\\\\''Shop plain items'\\\\'' section to homepage *)",
       "Bash(git commit -m 'Feature: Royal Mail shipping integration with weight-based postage *)",
       "Bash(git commit -m 'Add: Weight field to product admin pages *)",
-      "Bash(git commit -m 'Add: Shipping selector component and checkout integration *)"
+      "Bash(git commit -m 'Add: Shipping selector component and checkout integration *)",
+      "Bash(node clear-pending-orders.js)"
     ]
   }
 }