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/app_state_test.dart

@@ -757,13 +757,16 @@ void main() {
         isTrue,
       );
     }
-    state.completeSpeaking();
+    state.completeSpeaking(practiced: true);
     final speaking = state.attemptEvidence.where(
       (entry) => entry.taskId == 'lesson-$segmentId-speaking',
     );
-    // Follow-reading is assisted practice for every target, never
-    // independent evidence for one of them.
-    expect(speaking.map((entry) => entry.itemId), targets);
+    // Follow-reading only credits core items contained in the model line.
+    expect(speaking.map((entry) => entry.itemId).toSet(), {
+      'A0-W36',
+      'A0-P01',
+      'A0-P03',
+    });
     expect(
       speaking.every((entry) => entry.outcome == EvidenceKind.assisted),
       isTrue,
@@ -780,13 +783,44 @@ void main() {
   test('a first-try listening choice is recognition evidence', () {
     final state = AppState();
     state.completePreview();
+    state.recordListeningPlayback();
     state.completeListening(recognized: true);
 
-    for (final id in lessonById('a0-01').targetItemIds) {
-      expect(state.mastery[id]!.status, MasteryStatus.recognize);
+    expect(state.mastery['A0-P01']!.status, MasteryStatus.recognize);
+    expect(state.mastery['A0-P02']!.status, MasteryStatus.newItem);
+    expect(state.mastery['A0-P03']!.status, MasteryStatus.newItem);
+  });
+
+  test('segment comprehension does not award unrelated core items', () {
+    final state = AppState()..setPlacementStartLesson('a0-09');
+    state.completePreview();
+    state.recordListeningPlayback();
+    state.completeListening(recognized: true);
+
+    final evidence = state.attemptEvidence.where(
+      (entry) => entry.taskId == 'lesson-a0-09-a-listening-check',
+    );
+    expect(evidence.single.itemId, 'segment:a0-09-a');
+    expect(evidence.single.skill, '听力理解');
+    for (final id in lessonById('a0-09').targetItemIds) {
+      expect(state.mastery[id]!.status, MasteryStatus.newItem);
     }
   });
 
+  test('a model sentence without a core link stays segment evidence', () {
+    final state = AppState()..setPlacementStartLesson('a0-02');
+    state.completePreview();
+    state.completeListening();
+    state.completeSpeaking(practiced: true);
+
+    final evidence = state.attemptEvidence.where(
+      (entry) => entry.taskId == 'lesson-a0-02-a-speaking',
+    );
+    expect(evidence.single.itemId, 'segment:a0-02-a');
+    expect(evidence.single.skill, '句子跟读');
+    expect(state.mastery['A0-P04']!.status, MasteryStatus.newItem);
+  });
+
   test('scene dialogue credits taught items the learner actually used', () {
     final state = AppState();
     state.completePreview();