feat: Fully working lifecycle for the Robotoff question in the Product page

packages/smooth_app/lib/l10n/app_en.arb

@@ -350,6 +350,14 @@
     "@tap_to_answer": {
         "description": "Button label shown on a product, clicking the button opens a card with unanswered product questions, users can answer these to contribute to Open food facts and gain rewards."
     },
+    "tap_to_answer_hint": "Tap here to answer questions about this product",
+    "@tap_to_answer_hint": {
+        "description": "Hint for accessibility readers to answer Robotoff questions."
+    },
+    "robotoff_questions_loading_hint": "Please wait while questions about this product are loaded",
+    "@robotoff_questions_loading_hint": {
+        "description": "Hint for accessibility readers while Robotoff questions are loaded"
+    },
     "saving_answer": "Saving your answer",
     "@saving_answer": {
         "description": "Dialog shown to users after they have answered a question, while the answer is being saved in the BE."

packages/smooth_app/lib/pages/hunger_games/question_page.dart

@@ -22,17 +22,58 @@ Future<void> openQuestionPage(
   List<RobotoffQuestion>? questions,
   Function()? updateProductUponAnswers,
 }) =>
-    showDialog<void>(
+    showGeneralDialog<void>(
       context: context,
       barrierColor: Colors.black.withOpacity(0.7),
-      builder: (_) => BackdropFilter(
-        filter: ImageFilter.blur(sigmaX: 1.0, sigmaY: 1.0),
-        child: _QuestionPage(
-          product: product,
-          questions: questions,
-          updateProductUponAnswers: updateProductUponAnswers,
-        ),
-      ),
+      pageBuilder: (_, __, ___) => EMPTY_WIDGET,
+      transitionBuilder: (
+        BuildContext context,
+        Animation<double> a1,
+        Animation<double> a2,
+        Widget child,
+      ) {
+        return SafeArea(
+          child: Stack(
+            children: <Widget>[
+              Positioned.fill(
+                child: GestureDetector(
+                  excludeFromSemantics: true,
+                  onTap: () => Navigator.of(context).maybePop(),
+                ),
+              ),
+              Align(
+                alignment: Alignment.center,
+                child: Transform.scale(
+                  scale: a1.value,
+                  child: Opacity(
+                    opacity: a1.value,
+                    child: SafeArea(
+                      child: BackdropFilter(
+                        filter: ImageFilter.blur(sigmaX: 1.0, sigmaY: 1.0),
+                        child: _QuestionPage(
+                          product: product,
+                          questions: questions,
+                          updateProductUponAnswers: updateProductUponAnswers,
+                        ),
+                      ),
+                    ),
+                  ),
+                ),
+              ),
+              Positioned.directional(
+                textDirection: Directionality.of(context),
+                top: 0.0,
+                start: SMALL_SPACE,
+                child: Opacity(
+                  opacity: a1.value,
+                  child: const _CloseButton(),
+                ),
+              ),
+            ],
+          ),
+        );
+      },
+      transitionDuration: SmoothAnimationsDuration.medium,
     );
 
 class _QuestionPage extends StatefulWidget {
@@ -112,20 +153,7 @@ class _QuestionPageState extends State<_QuestionPage>
           }
           return true;
         },
-        child: Stack(
-          children: <Widget>[
-            Align(
-              alignment: Alignment.center,
-              child: _buildAnimationSwitcher(),
-            ),
-            Positioned.directional(
-              textDirection: Directionality.of(context),
-              top: 0.0,
-              start: SMALL_SPACE,
-              child: const _CloseButton(),
-            ),
-          ],
-        ),
+        child: Center(child: _buildAnimationSwitcher()),
       );
 
   AnimatedSwitcher _buildAnimationSwitcher() => AnimatedSwitcher(

packages/smooth_app/lib/pages/product/new_product_page.dart

@@ -26,6 +26,7 @@ import 'package:smooth_app/pages/inherited_data_manager.dart';
 import 'package:smooth_app/pages/product/common/product_list_page.dart';
 import 'package:smooth_app/pages/product/common/product_refresher.dart';
 import 'package:smooth_app/pages/product/edit_product_page.dart';
+import 'package:smooth_app/pages/product/product_questions_widget.dart';
 import 'package:smooth_app/pages/product/summary_card.dart';
 import 'package:smooth_app/pages/product_list_user_dialog_helper.dart';
 import 'package:smooth_app/query/product_query.dart';
@@ -57,6 +58,7 @@ class _ProductPageState extends State<ProductPage> with TraceableClientMixin {
   late final Product _initialProduct;
   late final LocalDatabase _localDatabase;
   late ProductPreferences _productPreferences;
+  bool _keepRobotoffQuestionsAlive = true;
 
   bool scrollingUp = true;
 
@@ -202,11 +204,14 @@ class _ProductPageState extends State<ProductPage> with TraceableClientMixin {
                   widget.heroTag?.isNotEmpty == true,
               child: Hero(
                 tag: widget.heroTag ?? '',
-                child: SummaryCard(
-                  _product,
-                  _productPreferences,
-                  isFullVersion: true,
-                  showUnansweredQuestions: true,
+                child: KeepQuestionWidgetAlive(
+                  keepWidgetAlive: _keepRobotoffQuestionsAlive,
+                  child: SummaryCard(
+                    _product,
+                    _productPreferences,
+                    isFullVersion: true,
+                    showUnansweredQuestions: true,
+                  ),
                 ),
               ),
             ),
@@ -343,17 +348,23 @@ class _ProductPageState extends State<ProductPage> with TraceableClientMixin {
               Icons.edit,
               appLocalizations.edit_product_label,
               () async {
+                setState(() => _keepRobotoffQuestionsAlive = false);
+
                 AnalyticsHelper.trackEvent(
                   AnalyticsEvent.openProductEditPage,
                   barcode: _barcode,
                 );
+
                 await Navigator.push<void>(
                   context,
                   MaterialPageRoute<void>(
                     builder: (BuildContext context) =>
                         EditProductPage(_product),
                   ),
                 );
+
+                // Force Robotoff questions to be reloaded
+                setState(() => _keepRobotoffQuestionsAlive = true);
               },
             ),
             _buildActionBarItem(