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/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,