feat: Knowledge Panel details page accessibility improvements

packages/smooth_app/lib/cards/data_cards/score_card.dart

@@ -48,15 +48,17 @@ class ScoreCard extends StatelessWidget {
     required Attribute attribute,
     required this.isClickable,
     this.margin,
-  })  : iconUrl = attribute.iconUrl,
+  })  : type = ScoreCardType.attribute,
+        iconUrl = attribute.iconUrl,
         description = attribute.descriptionShort ?? attribute.description ?? '',
         cardEvaluation = getCardEvaluationFromAttribute(attribute);
 
   ScoreCard.titleElement({
     required TitleElement titleElement,
     required this.isClickable,
     this.margin,
-  })  : iconUrl = titleElement.iconUrl,
+  })  : type = ScoreCardType.title,
+        iconUrl = titleElement.iconUrl,
         description = titleElement.title,
         cardEvaluation =
             getCardEvaluationFromKnowledgePanelTitleElement(titleElement);
@@ -66,6 +68,7 @@ class ScoreCard extends StatelessWidget {
   final CardEvaluation cardEvaluation;
   final bool isClickable;
   final EdgeInsetsGeometry? margin;
+  final ScoreCardType type;
 
   @override
   Widget build(BuildContext context) {
@@ -85,7 +88,8 @@ class ScoreCard extends StatelessWidget {
     return Semantics(
       value: _generateSemanticsValue(context),
       excludeSemantics: true,
-      button: true,
+      header: type == ScoreCardType.title,
+      button: isClickable,
       child: Padding(
         padding: margin ?? const EdgeInsets.symmetric(vertical: SMALL_SPACE),
         child: Ink(
@@ -124,6 +128,10 @@ class ScoreCard extends StatelessWidget {
   }
 
   String _generateSemanticsValue(BuildContext context) {
+    if (type == ScoreCardType.title) {
+      return description;
+    }
+
     final String? iconLabel = SvgCache.getSemanticsLabel(context, iconUrl!);
 
     if (iconLabel == null) {
@@ -133,3 +141,8 @@ class ScoreCard extends StatelessWidget {
     }
   }
 }
+
+enum ScoreCardType {
+  title,
+  attribute,
+}

packages/smooth_app/lib/knowledge_panel/knowledge_panels/knowledge_panel_group_card.dart

@@ -28,10 +28,13 @@ class KnowledgePanelGroupCard extends StatelessWidget {
           if (groupElement.title != null && groupElement.title!.isNotEmpty)
             Padding(
               padding: const EdgeInsetsDirectional.only(top: LARGE_SPACE),
-              child: Text(
-                groupElement.title!,
-                style:
-                    themeData.textTheme.titleSmall!.apply(color: Colors.grey),
+              child: Semantics(
+                explicitChildNodes: true,
+                child: Text(
+                  groupElement.title!,
+                  style:
+                      themeData.textTheme.titleSmall!.apply(color: Colors.grey),
+                ),
               ),
             ),
           for (final String panelId in groupElement.panelIds)

packages/smooth_app/lib/knowledge_panel/knowledge_panels/knowledge_panel_page.dart

@@ -1,5 +1,6 @@
 import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
+import 'package:flutter_gen/gen_l10n/app_localizations.dart';
 import 'package:matomo_tracker/matomo_tracker.dart';
 import 'package:openfoodfacts/openfoodfacts.dart';
 import 'package:provider/provider.dart';
@@ -50,13 +51,19 @@ class _KnowledgePanelPageState extends State<KnowledgePanelPage>
 
   @override
   Widget build(BuildContext context) {
+    final AppLocalizations appLocalizations = AppLocalizations.of(context);
+    final String title = _getTitle();
+
     context.watch<LocalDatabase>();
     refreshUpToDate();
     return SmoothScaffold(
       appBar: SmoothAppBar(
-        title: Text(
-          _getTitle(),
-          maxLines: 2,
+        title: Semantics(
+          label: _getTitleForAccessibility(appLocalizations, title),
+          child: Text(
+            title,
+            maxLines: 2,
+          ),
         ),
       ),
       body: RefreshIndicator(
@@ -126,6 +133,24 @@ class _KnowledgePanelPageState extends State<KnowledgePanelPage>
     return '';
   }
 
+  String _getTitleForAccessibility(
+    AppLocalizations appLocalizations,
+    String title,
+  ) {
+    final String productName = upToDateProduct.productName ??
+        upToDateProduct.abbreviatedName ??
+        upToDateProduct.genericName ??
+        '';
+    if (title.isEmpty) {
+      return appLocalizations.knowledge_panel_page_title_no_title(productName);
+    } else {
+      return appLocalizations.knowledge_panel_page_title(
+        title,
+        productName,
+      );
+    }
+  }
+
   @override
   void debugFillProperties(DiagnosticPropertiesBuilder properties) {
     super.debugFillProperties(properties);

packages/smooth_app/lib/knowledge_panel/knowledge_panels/knowledge_panel_text_card.dart

@@ -18,9 +18,11 @@ class KnowledgePanelTextCard extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
-    final Widget text = SmoothHtmlWidget(
-      textElement.html,
-      textStyle: WellSpacedTextHelper.TEXT_STYLE_WITH_WELL_SPACED,
+    final Widget text = MergeSemantics(
+      child: SmoothHtmlWidget(
+        textElement.html,
+        textStyle: WellSpacedTextHelper.TEXT_STYLE_WITH_WELL_SPACED,
+      ),
     );
 
     if (!_hasSource) {

packages/smooth_app/lib/l10n/app_en.arb

@@ -2572,5 +2572,26 @@
     "link_cant_be_opened": "This link can't be opened on your device. Please check that you have a browser installed.",
     "@link_cant_be_opened": {
         "description": "An error may happen if the device doesn't have a browser installed."
+    },
+    "knowledge_panel_page_title_no_title": "Details for {productName}",
+    "@knowledge_panel_page_title_no_title": {
+        "description": "The title of the page when we click on an item in the product page and this page is unnamed",
+        "placeholders": {
+            "productName": {
+                "type": "String"
+            }
+        }
+    },
+    "knowledge_panel_page_title": "Details for {pageName} with {productName}",
+    "@knowledge_panel_page_title": {
+        "description": "The title of the page when we click on an item in the product page",
+        "placeholders": {
+            "pageName": {
+                "type": "String"
+            },
+            "productName": {
+                "type": "String"
+            }
+        }
     }
 }