Refactor dialog widgets and enhance multi-variant management

lib/features/seller/data/models/listing_draft.dart

@@ -93,14 +93,23 @@ CreateListingRequest listingDraftRequest({
   required ListingCondition condition,
   required String currency,
   required PriceMode priceMode,
-  required int price,
-  required int weightG,
-  required int quantity,
+  List<CreateVariantRequest>? variants,
+  int? price,
+  int? weightG,
+  int? quantity,
   List<String> attachments = const [],
   List<String> tags = const [],
   Map<String, Object> specifications = const {},
 }) {
   final slugs = listingTags(tags);
+  final finalVariants = variants ?? [
+    CreateVariantRequest(
+      price: price ?? 0,
+      quantity: quantity ?? 1,
+      attributes: defaultVariantAttributes,
+      packageDetails: <String, Object>{'weight_g': weightG ?? 500},
+    ),
+  ];
 
   return CreateListingRequest(
     name: name,
@@ -114,16 +123,6 @@ CreateListingRequest listingDraftRequest({
     attachments: attachments.isEmpty ? null : attachments,
     tags: slugs.isEmpty ? null : slugs,
     specifications: specifications.isEmpty ? null : specifications,
-    variants: [
-      // One variant: this is a marketplace for used goods, so a listing is
-      // normally the one item in the seller's hands. Price and parcel weight
-      // live on the variant, which is why it exists at all.
-      CreateVariantRequest(
-        price: price,
-        quantity: quantity,
-        attributes: defaultVariantAttributes,
-        packageDetails: <String, Object>{'weight_g': weightG},
-      ),
-    ],
+    variants: finalVariants,
   );
 }

lib/features/seller/data/repositories/seller_repository.dart

@@ -10,6 +10,7 @@ import 'package:shopnexus_flutter_app/api/generated/model/create_bank_account_re
 import 'package:shopnexus_flutter_app/api/generated/model/payment_session.dart';
 import 'package:shopnexus_flutter_app/api/generated/model/transaction.dart';
 import 'package:shopnexus_flutter_app/api/generated/model/update_bank_account_request.dart';
+import 'package:shopnexus_flutter_app/api/generated/model/create_variant_request.dart';
 import 'package:shopnexus_flutter_app/api/generated/model/update_variant_request.dart';
 import 'package:shopnexus_flutter_app/api/generated/model/create_withdrawal_request.dart';
 import 'package:shopnexus_flutter_app/api/generated/model/listing.dart';
@@ -20,6 +21,7 @@ import 'package:shopnexus_flutter_app/api/generated/model/order_item.dart';
 import 'package:shopnexus_flutter_app/api/generated/model/order_state.dart';
 import 'package:shopnexus_flutter_app/api/generated/model/order_summary.dart';
 import 'package:shopnexus_flutter_app/api/generated/model/listing_detail.dart';
+import 'package:shopnexus_flutter_app/api/generated/model/publish_listing_request.dart';
 import 'package:shopnexus_flutter_app/api/generated/model/tax_info.dart';
 import 'package:shopnexus_flutter_app/api/generated/model/update_listing_request.dart';
 import 'package:shopnexus_flutter_app/api/generated/model/upsert_tax_info_request.dart';
@@ -254,11 +256,26 @@ class SellerRepository {
   Future<void> hideListing(String id) =>
       _catalogApi.listingsIdPublicationDelete(id: id);
 
-  /// Re-queues a hidden listing for moderation, so it comes back as `pending`
-  /// rather than straight to `active`. That is also the route out of a takedown —
-  /// it clears the marker and its reason and the listing is reviewed again.
-  Future<void> publishListing(String id) =>
-      _catalogApi.listingsIdPublicationPost(id: id);
+  Future<void> publishListing(String id, {String? pickupContactId}) =>
+      _catalogApi.listingsIdPublicationPost(
+        id: id,
+        publishListingRequest: pickupContactId == null
+            ? null
+            : PublishListingRequest(pickupContactId: pickupContactId),
+      );
+
+  Future<ListingDetail> addVariant(
+    String listingId,
+    CreateVariantRequest request,
+  ) async {
+    final response = await _catalogApi.listingsIdVariantsPost(
+      id: listingId,
+      createVariantRequest: request,
+    );
+    final detail = response.data?.data;
+    if (detail == null) throw StateError('empty add variant response');
+    return detail;
+  }
 
   Future<void> deleteVariant(String id) => _catalogApi.variantsIdDelete(id: id);
 

lib/features/seller/presentation/providers/seller_products_provider.dart

@@ -79,6 +79,15 @@ class SellerProductsNotifier extends _$SellerProductsNotifier {
     await refresh();
   }
 
+  /// Sends a draft or inactive listing to moderation (`pending`).
+  Future<void> publishListing(String id, {String? pickupContactId}) async {
+    await ref.read(sellerRepositoryProvider).publishListing(
+      id,
+      pickupContactId: pickupContactId,
+    );
+    await refresh();
+  }
+
   Future<void> deleteListing(String id) async {
     await ref.read(sellerRepositoryProvider).deleteListing(id);
     await refresh();