整个课程和数据UI重新设计版本

kouyu_english/lib/core/app_state.dart

@@ -6,12 +6,11 @@ import 'package:flutter/foundation.dart';
 import 'package:shared_preferences/shared_preferences.dart';
 
 import 'models.dart';
-import 'a0_core.dart';
+import 'courses/courses.dart';
 import 'app_theme.dart';
 import 'generated_content.dart';
 import 'local_store.dart';
-import 'review_feedback.dart';
-import 'seed_courses.dart';
+import 'courses/course_repository.dart';
 import 'ai_config.dart';
 import 'ai_service.dart';
 import 'sherpa_stt_service.dart';
@@ -93,7 +92,7 @@ abstract class _AppStateData extends ChangeNotifier {
 }
 
 class AppState extends _AppStateData
-    with _ReviewAndMastery, _LessonProgress, _AssessmentProgress, _AiContent {
+    with _ReviewAndMastery, _AssessmentProgress, _LessonProgress, _AiContent {
   static const _storageKey = 'learning_state_v1';
   bool isLoaded = false;
   bool _writing = false;
@@ -112,6 +111,9 @@ class AppState extends _AppStateData
   Future<void> load() async {
     try {
       unawaited(SherpaSttService.instance.initialize());
+      // Adapt the A1–B1 JSON packs into the runtime registries before the saved
+      // snapshot is restored, so progress that points at those lessons resolves.
+      await CourseRepository.instance.load();
       final config = await AiConfigFile.loadFromAsset();
       if (config != null) {
         if (config.apiKey != null && config.apiKey!.trim().isNotEmpty) {
@@ -219,10 +221,10 @@ class AppState extends _AppStateData
     notifyListeners();
   }
 
-  /// Applies the placement result. Only A0 starting points exist until A1
-  /// content is frozen, and placement never counts as passing a lesson.
+  /// Applies the placement result. The start may land on any loaded lesson
+  /// across A0–B1, and placement never counts as passing a lesson.
   void setPlacementStartLesson(String lessonId) {
-    if (!a0SeedLessons.any((lesson) => lesson.id == lessonId)) return;
+    if (!allLessons.any((lesson) => lesson.id == lessonId)) return;
     placementStartLessonId = lessonId;
     activeLessonId = lessonId;
     _resetLessonFlow();