Feat: Add loading spinner for made-to-order page

- Create LoadingSpinner component with spinning circle
- Wrap products grid with Suspense boundary
- Shows spinner while products are loading
- Improves UX for slower connections

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

.claude/settings.local.json

@@ -160,7 +160,8 @@
       "Bash(curl -s http://127.0.0.1:3000/made-to-order)",
       "Bash(curl -s \"http://127.0.0.1:3000/products/awd-hoodie\")",
       "Bash(git commit -m 'Fix: NavDropdown link navigation with stopPropagation *)",
-      "Bash(git commit -m 'Feat: Remove all filters from products pages *)"
+      "Bash(git commit -m 'Feat: Remove all filters from products pages *)",
+      "Bash(git commit -m 'Feat: Add loading spinner for made-to-order page *)"
     ]
   }
 }