fix(voice): recover empty failed lessons

tests/voice-state.test.js

@@ -3,6 +3,7 @@ const test = require('node:test')
 
 const {
   getVoiceFailureHint,
+  getVoiceLessonRecoveryAction,
   getVoiceLessonStatusText,
   getVoicePrimaryAction,
   getVoicePrimaryActionText
@@ -83,6 +84,23 @@ test('ready lessons explain whether their transcript can be added again', () =>
   assert.equal(getVoiceLessonStatusText({ ...lesson, includedInGeneration: true }), '已生成反馈')
 })
 
+test('failed lessons distinguish retryable audio from empty failed records', () => {
+  const failedLesson = {
+    status: 'failed',
+    segments: []
+  }
+
+  assert.equal(getVoiceLessonRecoveryAction(failedLesson), 'rerecord')
+  assert.equal(getVoiceLessonRecoveryAction({
+    ...failedLesson,
+    segments: [{ status: 'failed' }]
+  }), 'retry')
+  assert.equal(getVoiceLessonRecoveryAction({
+    ...failedLesson,
+    status: 'ready'
+  }), null)
+})
+
 test('session refresh runs after a failed API action', async () => {
   const expected = new Error('generation rejected')
   let refreshCount = 0