fix: signature card repository wrong API

integration_test/export_flow_test.dart

@@ -42,10 +42,12 @@ void main() {
           ),
           documentRepositoryProvider.overrideWith(
             (ref) =>
-                DocumentStateNotifier()
+                DocumentStateNotifier()..openPicked(
-                  ..openPicked(path: 'test.pdf', pageCount: 5),
+                  path: 'integration_test/data/sample-local-pdf.pdf',
+                  pageCount: 5,
                 ),
-          useMockViewerProvider.overrideWith((ref) => true),
+          ),
+          useMockViewerProvider.overrideWith((ref) => false),
           exportServiceProvider.overrideWith((_) => fake),
           savePathPickerProvider.overrideWith(
             (_) => () async => 'C:/tmp/output.pdf',
@@ -99,16 +101,17 @@ void main() {
           ),
           documentRepositoryProvider.overrideWith(
             (ref) =>
-                DocumentStateNotifier()
+                DocumentStateNotifier()..openPicked(
-                  ..openPicked(path: 'test.pdf', pageCount: 5),
+                  path: 'integration_test/data/sample-local-pdf.pdf',
+                  pageCount: 5,
+                ),
           ),
           signatureAssetRepositoryProvider.overrideWith((ref) {
             final c = SignatureAssetRepository();
             c.add(sigBytes, name: 'image');
             return c;
           }),
-          // Keep mock viewer for determinism on CI/desktop devices
+          useMockViewerProvider.overrideWithValue(false),
-          useMockViewerProvider.overrideWithValue(true),
         ],
         child: const MaterialApp(
           localizationsDelegates: AppLocalizations.localizationsDelegates,

lib/data/repositories/signature_card_repository.dart

@@ -4,16 +4,20 @@ import '../../domain/models/model.dart';
 class SignatureCardStateNotifier extends StateNotifier<List<SignatureCard>> {
   SignatureCardStateNotifier() : super(const []);
 
-  add({required SignatureAsset asset, double rotationDeg = 0.0}) {
+  void add(SignatureCard card) {
+    state = List.of(state)..add(card);
+  }
+
+  void addWithAsset(SignatureAsset asset, double rotationDeg) {
     state = List.of(state)
       ..add(SignatureCard(asset: asset, rotationDeg: rotationDeg));
   }
 
-  void update({
+  void update(
-    required SignatureCard card,
+    SignatureCard card,
     double? rotationDeg,
     GraphicAdjust? graphicAdjust,
-  }) {
+  ) {
     final list = List<SignatureCard>.of(state);
     for (var i = 0; i < list.length; i++) {
       final c = list[i];

lib/ui/features/pdf/widgets/pdf_mock_continuous_list.dart

@@ -7,6 +7,8 @@ import 'pdf_page_overlays.dart';
 import 'pdf_providers.dart';
 import 'package:pdf_signature/data/repositories/signature_asset_repository.dart';
 // using only adjusted overlay, no direct model imports needed
+import '../../signature/widgets/signature_drag_data.dart';
+import 'package:pdf_signature/data/repositories/document_repository.dart';
 
 /// Mocked continuous viewer for tests or platforms without real viewer.
 @visibleForTesting
@@ -81,8 +83,50 @@ class _PdfMockContinuousListState extends ConsumerState<PdfMockContinuousList> {
                 child: Stack(
                   key: ValueKey('page_stack_$pageNum'),
                   children: [
-                    Container(
+                    DragTarget<SignatureDragData>(
-                      color: Colors.grey.shade200,
+                      onAcceptWithDetails: (details) {
+                        final dragData = details.data;
+                        final offset = details.offset;
+                        final renderBox =
+                            context.findRenderObject() as RenderBox?;
+                        if (renderBox != null) {
+                          final localPosition = renderBox.globalToLocal(offset);
+                          final normalizedX =
+                              localPosition.dx / renderBox.size.width;
+                          final normalizedY =
+                              localPosition.dy / renderBox.size.height;
+
+                          // Create a default rect for the signature (can be adjusted later)
+                          final rect = Rect.fromLTWH(
+                            (normalizedX - 0.1).clamp(
+                              0.0,
+                              0.8,
+                            ), // Center horizontally with some margin
+                            (normalizedY - 0.05).clamp(
+                              0.0,
+                              0.9,
+                            ), // Center vertically with some margin
+                            0.2, // Default width
+                            0.1, // Default height
+                          );
+
+                          // Add placement to the document
+                          ref
+                              .read(documentRepositoryProvider.notifier)
+                              .addPlacement(
+                                page: pageNum,
+                                rect: rect,
+                                asset: dragData.card?.asset,
+                                rotationDeg: dragData.card?.rotationDeg ?? 0.0,
+                              );
+                        }
+                      },
+                      builder: (context, candidateData, rejectedData) {
+                        return Container(
+                          color:
+                              candidateData.isNotEmpty
+                                  ? Colors.blue.withOpacity(0.3)
+                                  : Colors.grey.shade200,
                           child: Center(
                             child: Builder(
                               builder: (ctx) {
@@ -104,6 +148,8 @@ class _PdfMockContinuousListState extends ConsumerState<PdfMockContinuousList> {
                               },
                             ),
                           ),
+                        );
+                      },
                     ),
                     visible
                         ? Stack(

lib/ui/features/pdf/widgets/pdf_viewer_widget.dart

@@ -6,6 +6,7 @@ import 'package:pdf_signature/l10n/app_localizations.dart';
 import 'pdf_page_overlays.dart';
 import 'pdf_providers.dart';
 import './pdf_mock_continuous_list.dart';
+import '../../signature/widgets/signature_drag_data.dart';
 
 class PdfViewerWidget extends ConsumerStatefulWidget {
   const PdfViewerWidget({
@@ -115,6 +116,41 @@ class _PdfViewerWidgetState extends ConsumerState<PdfViewerWidget> {
             },
           ),
         ),
+        // Drag target for dropping signatures
+        Positioned.fill(
+          child: DragTarget<SignatureDragData>(
+            onAcceptWithDetails: (details) {
+              final dragData = details.data;
+
+              // For real PDF viewer, we need to calculate which page was dropped on
+              // This is a simplified implementation - in a real app you'd need to
+              // determine the exact page and position within that page
+              final currentPage =
+                  ref.read(documentRepositoryProvider).currentPage;
+
+              // Create a default rect for the signature (can be adjusted later)
+              final rect = const Rect.fromLTWH(0.1, 0.1, 0.2, 0.1);
+
+              // Add placement to the document
+              ref
+                  .read(documentRepositoryProvider.notifier)
+                  .addPlacement(
+                    page: currentPage,
+                    rect: rect,
+                    asset: dragData.card?.asset,
+                    rotationDeg: dragData.card?.rotationDeg ?? 0.0,
+                  );
+            },
+            builder: (context, candidateData, rejectedData) {
+              return Container(
+                color:
+                    candidateData.isNotEmpty
+                        ? Colors.blue.withOpacity(0.1)
+                        : Colors.transparent,
+              );
+            },
+          ),
+        ),
         // Add signature overlays on top
         Positioned.fill(
           child: Consumer(

lib/ui/features/signature/widgets/signature_card.dart

@@ -1,5 +1,5 @@
 import 'package:flutter/material.dart';
-import 'package:pdf_signature/domain/models/model.dart';
+import 'package:pdf_signature/domain/models/model.dart' as domain;
 import 'signature_drag_data.dart';
 import 'rotated_signature_image.dart';
 import 'package:pdf_signature/l10n/app_localizations.dart';
@@ -15,7 +15,7 @@ class SignatureCard extends StatelessWidget {
     this.useCurrentBytesForDrag = false,
     this.rotationDeg = 0.0,
   });
-  final SignatureAsset asset;
+  final domain.SignatureAsset asset;
   final bool disabled;
   final VoidCallback onDelete;
   final VoidCallback? onTap;
@@ -142,7 +142,12 @@ class SignatureCard extends StatelessWidget {
       data:
           useCurrentBytesForDrag
               ? const SignatureDragData()
-              : SignatureDragData(asset: asset),
+              : SignatureDragData(
+                card: domain.SignatureCard(
+                  asset: asset,
+                  rotationDeg: rotationDeg,
+                ),
+              ),
       feedback: Opacity(
         opacity: 0.9,
         child: ConstrainedBox(

lib/ui/features/signature/widgets/signature_drag_data.dart

@@ -1,6 +1,6 @@
 import 'package:pdf_signature/domain/models/model.dart';
 
 class SignatureDragData {
-  final SignatureAsset? asset; // null means use current processed signature
+  final SignatureCard? card; // null means use current processed signature
-  const SignatureDragData({this.asset});
+  const SignatureDragData({this.card});
 }

test/features/step/the_user_drags_this_signature_card_on_the_page_of_the_document_to_place_a_signature_placement.dart

@@ -4,6 +4,7 @@ import 'package:flutter_test/flutter_test.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:pdf_signature/data/repositories/document_repository.dart';
 import 'package:pdf_signature/data/repositories/signature_asset_repository.dart';
+import 'package:pdf_signature/data/repositories/signature_card_repository.dart';
 import 'package:pdf_signature/domain/models/model.dart';
 import '_world.dart';
 
@@ -37,6 +38,14 @@ theUserDragsThisSignatureCardOnThePageOfTheDocumentToPlaceASignaturePlacement(
         .firstWhere((a) => a.name == 'placement.png');
   }
 
+  // create a signature card
+  final temp_card = SignatureCard(asset: asset, rotationDeg: 0);
+  container
+      .read(signatureCardRepositoryProvider.notifier)
+      .addWithAsset(temp_card.asset, temp_card.rotationDeg);
+  // drag and drop (DragTarget<SignatureCard>, `onAccept`) it on document page
+  final drop_card = temp_card;
+
   // Place it on the current page
   final pdf = container.read(documentRepositoryProvider);
   container
@@ -44,6 +53,7 @@ theUserDragsThisSignatureCardOnThePageOfTheDocumentToPlaceASignaturePlacement(
       .addPlacement(
         page: pdf.currentPage,
         rect: Rect.fromLTWH(100, 100, 100, 50),
-        asset: asset,
+        asset: drop_card.asset,
+        rotationDeg: drop_card.rotationDeg,
       );
 }

test/features/step/the_user_places_a_signature_placement_from_asset_on_page.dart

@@ -6,7 +6,7 @@ import 'package:pdf_signature/data/repositories/document_repository.dart';
 import 'package:pdf_signature/data/repositories/signature_asset_repository.dart';
 import '_world.dart';
 
-/// Usage: the user places a signature placement from asset <second_asset> on page <second_page>
+/// Usage: the user places a signature placement from asset <secondAsset> on page <secondPage>
 Future<void> theUserPlacesASignaturePlacementFromAssetOnPage(
   WidgetTester tester,
   String assetName,

test/features/support_multiple_signature_pictures.feature

@@ -2,15 +2,11 @@ Feature: support multiple signature assets
 
 	Scenario: Place signature placements on different pages with different assets
 		Given a multi-page document is open
-		When the user places a signature placement from asset <first_asset> on page <first_page>
+		When the user places a signature placement from asset <firstAsset> on page <firstPage>.
-		And the user places a signature placement from asset <second_asset> on page <second_page>
+		And the user places a signature placement from asset <secondAsset> on page <secondPage>.
 		Then both signature placements are shown on their respective pages
 		Examples:
-            # Same page, same asset
+			| firstAsset  | firstPage  | secondAsset  | secondPage  |
-            # Same page, different assets
-            # Different pages, same asset
-            # Different pages, different assets
-			| first_asset | first_page | second_asset | second_page |
             | 'alice.png' | 1          | 'alice.png'  | 1           | 
             | 'alice.png' | 1          | 'bob.png'    | 1           | 
 			| 'alice.png' | 1          | 'bob.png'    | 3           |