feat: 完善听力口语辅助状态记录、练习分块与复习抽查间隔机制

kouyu_english/lib/features/home/lesson_path.dart

@@ -3,6 +3,7 @@ import 'package:flutter/material.dart';
 import '../../core/app_state.dart';
 import '../../core/app_theme.dart';
 import '../../core/courses/courses.dart';
+import '../../core/models.dart';
 import '../../widgets/app_widgets.dart';
 
 /// 课程路径：全部课程按顺序排列，显示完成、当前与锁定状态。
@@ -17,7 +18,10 @@ class LessonPath extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
-    final done = allLessons
+    final available = allLessons
+        .where((lesson) => lesson.status == ContentStatus.approved)
+        .toList();
+    final done = available
         .where((lesson) => state.completedLessonIds.contains(lesson.id))
         .length;
     return SpacedColumn(
@@ -32,7 +36,7 @@ class LessonPath extends StatelessWidget {
               ),
             ),
             Text(
-              '$done/${allLessons.length} 完成',
+              '$done/${available.length} 已开放课程完成',
               style: TextStyle(fontSize: 13, color: AppColors.muted),
             ),
           ],
@@ -66,7 +70,8 @@ class _LessonTile extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     final completed = state.completedLessonIds.contains(lesson.id);
-    final current = lesson.id == state.activeLessonId && !completed;
+    final draft = lesson.status != ContentStatus.approved;
+    final current = lesson.id == state.activeLessonId && !completed && !draft;
     final open =
         state.isLessonUnlocked(lesson.id) &&
         (!state.reviewBacklog || completed);
@@ -98,7 +103,9 @@ class _LessonTile extends StatelessWidget {
                 ),
                 const SizedBox(height: 3),
                 Text(
-                  segments > 1
+                  draft
+                      ? '待教学审校后开放'
+                      : segments > 1
                       ? '${lesson.outcome} · 小段 $segmentsDone/$segments'
                       : lesson.outcome,
                   style: Theme.of(context).textTheme.bodyMedium,

kouyu_english/lib/features/home/today_task_card.dart

@@ -3,6 +3,7 @@ import 'package:flutter/material.dart';
 import '../../core/app_state.dart';
 import '../../core/app_theme.dart';
 import '../../core/courses/courses.dart';
+import '../../core/models.dart';
 import '../../widgets/app_widgets.dart';
 
 /// 今天最该做的一件事：继续课程对话 → 到期复习 → 阶段评估/巩固 → 下一课。
@@ -50,7 +51,8 @@ class TodayTaskCard extends StatelessWidget {
 
   _TodayTask _todayTask() {
     var lessonId = state.activeLessonId;
-    if (state.completedLessonIds.contains(lessonId)) {
+    if (state.completedLessonIds.contains(lessonId) ||
+        lessonById(lessonId).status != ContentStatus.approved) {
       final next = state.nextIncompleteLessonId;
       if (next != null) {
         lessonId = next;
@@ -101,8 +103,8 @@ class TodayTaskCard extends StatelessWidget {
     if (state.allLessonsComplete) {
       return _TodayTask(
         label: '已学完',
-        title: '所有课程已完成',
-        note: '你已学完全部课程内容！建议保持日常到期复习或自由情境对话。',
+        title: '当前开放课程已完成',
+        note: '后续课程待教学审校开放。现在可以继续到期复习或自由情境对话。',
         action: '去复习',
         minutes: '10 分钟',
         onPressed: onStartReview,