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/api_form.dart

@@ -732,6 +732,7 @@ class APIFormField {
 
         return ListTile(
           title: Text(item.partName),
+          subtitle: Text(item.locationPathString),
           leading: InvenTreeAPI().getThumbnail(item.partThumbnail),
           trailing: Text(item.quantityString()),
         );

lib/inventree/sales_order.dart

@@ -48,7 +48,7 @@ class InvenTreeSalesOrder extends InvenTreeOrder {
     Map<String, Map<String, dynamic>> fields = {
       "reference": {},
       "customer": {
-        "filters": {"is_customer": true},
+        "filters": {"is_customer": true, "active": true},
       },
       "customer_reference": {},
       "description": {},

lib/widget/order/sales_order_list.dart

@@ -151,9 +151,16 @@ class _PaginatedSalesOrderListState
 
     InvenTreeCompany? customer = order.customer;
 
+    // Build subtitle with customer name and optional total price
+    String subtitle = customer?.name ?? order.description;
+    if (order.totalPrice != null && order.totalPrice! > 0) {
+      subtitle +=
+          " • ${order.totalPriceCurrency} ${order.totalPrice!.toStringAsFixed(2)}";
+    }
+
     return ListTile(
       title: Text(order.reference),
-      subtitle: Text(order.description),
+      subtitle: Text(subtitle),
       leading: customer == null
           ? null
           : InvenTreeAPI().getThumbnail(customer.thumbnail),

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);
       },