fix: graphic adjust dialog has to show image preview

lib/app.dart

@@ -63,6 +63,7 @@ class MyApp extends StatelessWidget {
                 ],
                 routerConfig: ref.watch(routerProvider),
                 builder: (context, child) {
+                  final router = ref.watch(routerProvider);
                   return Scaffold(
                     appBar: AppBar(
                       title: Text(AppLocalizations.of(context).appTitle),
@@ -73,7 +74,11 @@ class MyApp extends StatelessWidget {
                           label: Text(AppLocalizations.of(context).settings),
                           onPressed:
                               () => showDialog<bool>(
-                                context: context,
+                                context:
+                                    router
+                                        .routerDelegate
+                                        .navigatorKey
+                                        .currentContext!,
                                 builder: (_) => const SettingsDialog(),
                               ),
                         ),

lib/routing/router.dart

@@ -1,4 +1,5 @@
 import 'dart:typed_data';
+import 'package:flutter/material.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:go_router/go_router.dart';
 import 'package:pdf_signature/ui/features/pdf/widgets/pdf_screen.dart';
@@ -79,6 +80,9 @@ final routerProvider = Provider<GoRouter>((ref) {
     signatureCardRepositoryProvider.notifier,
   );
 
+  // Create a navigator key for the router
+  final navigatorKey = GlobalKey<NavigatorState>();
+
   // Create a late variable for the router
   late final GoRouter router;
 
@@ -90,6 +94,7 @@ final routerProvider = Provider<GoRouter>((ref) {
   final initialLocation = documentNotifier.debugState.loaded ? '/pdf' : '/';
 
   router = GoRouter(
+    navigatorKey: navigatorKey,
     routes: [
       GoRoute(
         path: '/',

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

@@ -33,13 +33,6 @@ class AdjustmentsPanel extends StatelessWidget {
           runSpacing: 8,
           crossAxisAlignment: WrapCrossAlignment.center,
           children: [
-            Checkbox(
-              key: const Key('chk_aspect_lock'),
-              value: aspectLocked,
-              onChanged: (v) => onAspectLockedChanged(v ?? false),
-            ),
-            Text(AppLocalizations.of(context).lockAspectRatio),
-            const SizedBox(width: 16),
             Switch(
               key: const Key('swt_bg_removal'),
               value: bgRemoval,

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

@@ -1,22 +1,51 @@
 import 'package:flutter/material.dart';
 import 'package:pdf_signature/l10n/app_localizations.dart';
-import 'adjustments_panel.dart';
+import '../../pdf/widgets/adjustments_panel.dart';
-// No live preview wiring in simplified dialog
+import '../../../../domain/models/model.dart' as domain;
+import 'rotated_signature_image.dart';
+
+class ImageEditorResult {
+  final double rotation;
+  final domain.GraphicAdjust graphicAdjust;
+
+  const ImageEditorResult({
+    required this.rotation,
+    required this.graphicAdjust,
+  });
+}
 
 class ImageEditorDialog extends StatefulWidget {
-  const ImageEditorDialog({super.key});
+  const ImageEditorDialog({
+    super.key,
+    required this.asset,
+    required this.initialRotation,
+    required this.initialGraphicAdjust,
+  });
+
+  final domain.SignatureAsset asset;
+  final double initialRotation;
+  final domain.GraphicAdjust initialGraphicAdjust;
 
   @override
   State<ImageEditorDialog> createState() => _ImageEditorDialogState();
 }
 
 class _ImageEditorDialogState extends State<ImageEditorDialog> {
-  // Local-only state for demo/tests; no persistence to repositories.
+  late bool _aspectLocked;
-  bool _aspectLocked = false;
+  late bool _bgRemoval;
-  bool _bgRemoval = false;
+  late double _contrast;
-  double _contrast = 1.0; // 0..2
+  late double _brightness;
-  double _brightness = 0.0; // -1..1
+  late double _rotation;
-  double _rotation = 0.0; // -180..180
+
+  @override
+  void initState() {
+    super.initState();
+    _aspectLocked = false; // Not persisted in GraphicAdjust
+    _bgRemoval = widget.initialGraphicAdjust.bgRemoval;
+    _contrast = widget.initialGraphicAdjust.contrast;
+    _brightness = widget.initialGraphicAdjust.brightness;
+    _rotation = widget.initialRotation;
+  }
 
   @override
   Widget build(BuildContext context) {
@@ -37,7 +66,7 @@ class _ImageEditorDialogState extends State<ImageEditorDialog> {
                   style: Theme.of(context).textTheme.titleMedium,
                 ),
                 const SizedBox(height: 12),
-                // Preview placeholder; no actual processed bytes wired
+                // Preview with actual signature image
                 SizedBox(
                   height: 160,
                   child: DecoratedBox(
@@ -45,7 +74,13 @@ class _ImageEditorDialogState extends State<ImageEditorDialog> {
                       border: Border.all(color: Theme.of(context).dividerColor),
                       borderRadius: BorderRadius.circular(8),
                     ),
-                    child: const Center(child: Text('No signature loaded')),
+                    child: ClipRRect(
+                      borderRadius: BorderRadius.circular(8),
+                      child: RotatedSignatureImage(
+                        bytes: widget.asset.bytes,
+                        rotationDeg: _rotation,
+                      ),
+                    ),
                   ),
                 ),
                 const SizedBox(height: 12),
@@ -84,7 +119,17 @@ class _ImageEditorDialogState extends State<ImageEditorDialog> {
                   children: [
                     TextButton(
                       key: const Key('btn_image_editor_close'),
-                      onPressed: () => Navigator.of(context).pop(),
+                      onPressed:
+                          () => Navigator.of(context).pop(
+                            ImageEditorResult(
+                              rotation: _rotation,
+                              graphicAdjust: domain.GraphicAdjust(
+                                contrast: _contrast,
+                                brightness: _brightness,
+                                bgRemoval: _bgRemoval,
+                              ),
+                            ),
+                          ),
                       child: Text(
                         MaterialLocalizations.of(context).closeButtonLabel,
                       ),

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

@@ -112,6 +112,13 @@ class _RotatedSignatureImageState extends State<RotatedSignatureImage> {
       filterQuality: widget.filterQuality,
       alignment: widget.alignment,
       semanticLabel: widget.semanticLabel,
+      errorBuilder: (context, error, stackTrace) {
+        // Return a placeholder for invalid images
+        return Container(
+          color: Colors.grey[300],
+          child: const Icon(Icons.broken_image, color: Colors.grey),
+        );
+      },
     );
 
     if (angle != 0.0) {

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

@@ -2,11 +2,12 @@ import 'dart:typed_data';
 import 'package:flutter/material.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:pdf_signature/l10n/app_localizations.dart';
-// No direct model construction needed here
+// Direct model construction is needed for creating SignatureAssets
 
 import 'package:pdf_signature/data/repositories/signature_asset_repository.dart';
 import 'package:pdf_signature/data/repositories/signature_card_repository.dart';
-import '../../pdf/widgets/image_editor_dialog.dart';
+import 'package:pdf_signature/domain/models/model.dart' hide SignatureCard;
+import 'image_editor_dialog.dart';
 import 'signature_card.dart';
 
 /// Data for drag-and-drop is in signature_drag_data.dart
@@ -59,10 +60,20 @@ class _SignatureDrawerState extends ConsumerState<SignatureDrawer> {
                           .remove(card),
                   onAdjust: () async {
                     if (!mounted) return;
-                    await showDialog(
+                    final result = await showDialog<ImageEditorResult>(
                       context: context,
-                      builder: (_) => const ImageEditorDialog(),
+                      builder:
+                          (_) => ImageEditorDialog(
+                            asset: card.asset,
+                            initialRotation: card.rotationDeg,
+                            initialGraphicAdjust: card.graphicAdjust,
+                          ),
                     );
+                    if (result != null && mounted) {
+                      ref
+                          .read(signatureCardRepositoryProvider.notifier)
+                          .update(card, result.rotation, result.graphicAdjust);
+                    }
                   },
                   onTap: () {
                     // state = const Rect.fromLTWH(0.2, 0.2, 0.3, 0.15);
@@ -107,12 +118,22 @@ class _SignatureDrawerState extends ConsumerState<SignatureDrawer> {
                                     await widget.onLoadSignatureFromFile();
                                 final b = loaded;
                                 if (b != null) {
+                                  final asset = SignatureAsset(
+                                    bytes: b,
+                                    name: 'image',
+                                  );
                                   ref
                                       .read(
                                         signatureAssetRepositoryProvider
                                             .notifier,
                                       )
                                       .add(b, name: 'image');
+                                  ref
+                                      .read(
+                                        signatureCardRepositoryProvider
+                                            .notifier,
+                                      )
+                                      .addWithAsset(asset, 0.0);
                                 }
                               },
                       icon: const Icon(Icons.image_outlined),
@@ -127,12 +148,22 @@ class _SignatureDrawerState extends ConsumerState<SignatureDrawer> {
                                 final drawn = await widget.onOpenDrawCanvas();
                                 final b = drawn;
                                 if (b != null) {
+                                  final asset = SignatureAsset(
+                                    bytes: b,
+                                    name: 'drawing',
+                                  );
                                   ref
                                       .read(
                                         signatureAssetRepositoryProvider
                                             .notifier,
                                       )
                                       .add(b, name: 'drawing');
+                                  ref
+                                      .read(
+                                        signatureCardRepositoryProvider
+                                            .notifier,
+                                      )
+                                      .addWithAsset(asset, 0.0);
                                 }
                               },
                       icon: const Icon(Icons.gesture),