feat: cleanup and improvements for checkout fields

- Removed all debug logging (backend and frontend)
- Added filter hook 'woonoow_standard_checkout_field_keys' for extensibility
- Added form-row-wide class support to admin OrderForm
- Tax is automatically handled by WC's calculate_totals()

admin-spa/src/routes/Orders/partials/OrderForm.tsx

@@ -1165,7 +1165,9 @@ export default function OrderForm({
                 .filter((f: any) => f.fieldset === 'shipping' && !f.hidden)
                 .sort((a: any, b: any) => (a.priority || 0) - (b.priority || 0))
                 .map((field: any) => {
-                  const isWide = ['address_1', 'address_2'].includes(field.key.replace('shipping_', ''));
+                  // Check for full width: address fields or form-row-wide class from PHP
+                  const hasFormRowWide = Array.isArray(field.class) && field.class.includes('form-row-wide');
+                  const isWide = hasFormRowWide || ['address_1', 'address_2'].includes(field.key.replace('shipping_', ''));
                   const fieldKey = field.key.replace('shipping_', '');
 
                   return (