chore: add morphExampleInfo to activity model

lib/pangea/analytics_practice/analytics_practice_session_model.dart

@@ -12,6 +12,42 @@ class MorphExampleInfo {
   const MorphExampleInfo({
     required this.exampleMessage,
   });
+
+  Map<String, dynamic> toJson() {
+    final segments = <Map<String, dynamic>>[];
+
+    for (final span in exampleMessage) {
+      if (span is TextSpan) {
+        segments.add({
+          'text': span.text ?? '',
+          'isBold': span.style?.fontWeight == FontWeight.bold,
+        });
+      }
+    }
+
+    return {
+      'segments': segments,
+    };
+  }
+
+  factory MorphExampleInfo.fromJson(Map<String, dynamic> json) {
+    final segments = json['segments'] as List<dynamic>? ?? [];
+
+    final spans = <InlineSpan>[];
+    for (final segment in segments) {
+      final text = segment['text'] as String? ?? '';
+      final isBold = segment['isBold'] as bool? ?? false;
+
+      spans.add(
+        TextSpan(
+          text: text,
+          style: isBold ? const TextStyle(fontWeight: FontWeight.bold) : null,
+        ),
+      );
+    }
+
+    return MorphExampleInfo(exampleMessage: spans);
+  }
 }
 
 class AnalyticsActivityTarget {
@@ -28,6 +64,7 @@ class AnalyticsActivityTarget {
   Map<String, dynamic> toJson() => {
         'target': target.toJson(),
         'grammarErrorInfo': grammarErrorInfo?.toJson(),
+        'morphExampleInfo': morphExampleInfo?.toJson(),
       };
 
   factory AnalyticsActivityTarget.fromJson(Map<String, dynamic> json) =>
@@ -36,6 +73,9 @@ class AnalyticsActivityTarget {
         grammarErrorInfo: json['grammarErrorInfo'] != null
             ? GrammarErrorRequestInfo.fromJson(json['grammarErrorInfo'])
             : null,
+        morphExampleInfo: json['morphExampleInfo'] != null
+            ? MorphExampleInfo.fromJson(json['morphExampleInfo'])
+            : null,
       );
 }
 

lib/pangea/analytics_practice/morph_category_activity_generator.dart

@@ -1,3 +1,4 @@
+import 'package:fluffychat/pangea/analytics_practice/analytics_practice_session_model.dart';
 import 'package:fluffychat/pangea/common/utils/error_handler.dart';
 import 'package:fluffychat/pangea/morphs/default_morph_mapping.dart';
 import 'package:fluffychat/pangea/morphs/morph_models.dart';
@@ -58,6 +59,8 @@ class MorphCategoryActivityGenerator {
           choices: choices.toSet(),
           answers: {morphTag},
         ),
+        morphExampleInfo:
+            req.morphExampleInfo ?? const MorphExampleInfo(exampleMessage: []),
       ),
     );
   }

lib/pangea/practice_activities/practice_activity_model.dart

@@ -3,6 +3,7 @@ import 'package:sentry_flutter/sentry_flutter.dart';
 import 'package:fluffychat/pangea/analytics_misc/construct_type_enum.dart';
 import 'package:fluffychat/pangea/analytics_misc/construct_use_type_enum.dart';
 import 'package:fluffychat/pangea/analytics_misc/constructs_model.dart';
+import 'package:fluffychat/pangea/analytics_practice/analytics_practice_session_model.dart';
 import 'package:fluffychat/pangea/events/models/pangea_token_model.dart';
 import 'package:fluffychat/pangea/morphs/morph_features_enum.dart';
 import 'package:fluffychat/pangea/practice_activities/activity_type_enum.dart';
@@ -111,6 +112,9 @@ sealed class PracticeActivityModel {
           tokens: tokens,
           morphFeature: morph!,
           multipleChoiceContent: multipleChoiceContent!,
+          morphExampleInfo: json['morph_example_info'] != null
+              ? MorphExampleInfo.fromJson(json['morph_example_info'])
+              : const MorphExampleInfo(exampleMessage: []),
         );
       case ActivityTypeEnum.lemmaAudio:
         assert(
@@ -307,6 +311,7 @@ class MorphCategoryPracticeActivityModel extends MorphPracticeActivityModel {
     required super.langCode,
     required super.morphFeature,
     required super.multipleChoiceContent,
+    required this.morphExampleInfo,
   });
 
   @override
@@ -330,6 +335,13 @@ class MorphCategoryPracticeActivityModel extends MorphPracticeActivityModel {
       xp: useType.pointValue,
     );
   }
+
+  @override
+  Map<String, dynamic> toJson() {
+    final json = super.toJson();
+    json['morph_example_info'] = morphExampleInfo.toJson();
+    return json;
+  }
 }
 
 class MorphMatchPracticeActivityModel extends MorphPracticeActivityModel {