feat(app): implement Product Scan review flow, dynamic batch expiry picker, custom PDFs, PO relationships, and aligned card layouts

lib/core/router/app_router.dart

@@ -6,6 +6,7 @@ import '../../features/auth/login_screen.dart';
 import '../../features/camera/camera_screen.dart';
 import '../../features/documents/documents_screen.dart';
 import '../../features/editor/editor_screen.dart';
+import '../../features/editor/product_editor_screen.dart';
 
 final appRouterProvider = Provider<GoRouter>((ref) {
   return GoRouter(
@@ -34,6 +35,13 @@ final appRouterProvider = Provider<GoRouter>((ref) {
           return EditorScreen(pendingId: pendingId);
         },
       ),
+      GoRoute(
+        path: '/product-editor',
+        builder: (context, state) {
+          final pendingId = state.extra as String?;
+          return ProductEditorScreen(pendingId: pendingId);
+        },
+      ),
     ],
   );
 });