Harden published curriculum and student flows

apps/student_app/lib/data/models/subject_model.dart

@@ -209,6 +209,8 @@ class CurriculumLessonItemModel {
   final List<String> outcomes;
   final String? markdownFilePath;
   final String? curriculumLessonId;
+  final String? curriculumVersion;
+  final String? primaryLessonAssetId;
   final int durationSeconds;
   final int checkpointsCount;
   final bool isCompleted;
@@ -220,6 +222,8 @@ class CurriculumLessonItemModel {
     this.outcomes = const [],
     this.markdownFilePath,
     this.curriculumLessonId,
+    this.curriculumVersion,
+    this.primaryLessonAssetId,
     this.durationSeconds = 0,
     this.checkpointsCount = 0,
     this.isCompleted = false,
@@ -254,6 +258,8 @@ class CurriculumLessonItemModel {
       outcomes: outs,
       markdownFilePath: filePath,
       curriculumLessonId: json['curriculum_lesson_id']?.toString(),
+      curriculumVersion: json['curriculum_version']?.toString(),
+      primaryLessonAssetId: json['primary_lesson_asset_id']?.toString(),
       durationSeconds: (json['duration_seconds'] as num?)?.toInt() ?? 0,
       checkpointsCount: (json['checkpoints_count'] as num?)?.toInt() ?? 0,
       isCompleted: (json['is_completed'] as bool?) ?? false,