feat: Implement live Shipping settings page

Implemented functional Shipping settings page with WooCommerce integration.

Features:
✅ Fetch shipping zones from WooCommerce API
✅ Display zones with rates in card layout
✅ Refresh button to reload data
✅ "View in WooCommerce" button for full settings
✅ Edit zone links to WooCommerce
✅ Add zone link to WooCommerce
✅ Loading states with spinner
✅ Empty state when no zones configured
✅ Internationalization (i18n) throughout
✅ Shipping tips help card

Implementation:
- Uses React Query for data fetching
- Integrates with WooCommerce shipping API
- Links to WooCommerce for detailed configuration
- Clean, modern UI matching Payments page
- Responsive design

API Endpoint:
- GET /settings/shipping/zones

Note: Full CRUD operations handled in WooCommerce for now.
Future: Add inline editing capabilities.

admin-spa/src/index.css

@@ -130,4 +130,9 @@
 
 /* --- WooNooW: Popper menus & fullscreen fixes --- */
 [data-radix-popper-content-wrapper] { z-index: 2147483647 !important; }
-body.woonoow-fullscreen .woonoow-app { overflow: visible; }
+body.woonoow-fullscreen .woonoow-app { overflow: visible; }
+
+/* a[href] {
+  color: rgb(34 197 94);
+  font-weight: bold;
+} */