Improve Sales Order UX: Stock Location, Customer Filtering & Enhanced List View (#756)

* feat(sales-order): Improve UX with location display, customer filtering, and enhanced list

- Show stock location when selecting items to allocate in sales orders
- Filter inactive customers from customer selection dropdown
- Display customer name and order total in sales order list view

These changes improve the day-to-day usability for warehouse and field staff
by providing more context in key workflows without requiring extra navigation.

* Format code

lib/widget/order/so_allocation_list.dart

@@ -55,10 +55,11 @@ class _PaginatedSOAllocationListState
 
     InvenTreePart? part = allocation.part;
     InvenTreeStockItem? stockItem = allocation.stockItem;
+    InvenTreeStockLocation? location = allocation.location;
 
     return ListTile(
       title: Text(part?.fullname ?? ""),
-      subtitle: Text(part?.description ?? ""),
+      subtitle: Text(location?.pathstring ?? L10().locationNotSet),
       onTap: () async {
         stockItem?.goToDetailPage(context);
       },