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/test/widget_test.dart

@@ -38,7 +38,7 @@ void main() {
 
     expect(state.lessonWritingDraft, 'Hello. I am Shen.');
     final check = tester.widget<FilledButton>(
-      find.widgetWithText(FilledButton, '检查句子'),
+      find.widgetWithText(FilledButton, '提交并继续'),
     );
     expect(check.onPressed, isNotNull);
   });