fix(voice): restore failed transcription recovery

pages/feedback/voice-state.ts

@@ -0,0 +1,39 @@
+import type { FeedbackSession, VoiceAudioSegment } from '../../utils/types'
+
+export type VoicePrimaryAction = 'save' | 'retry' | 'processing' | 'generate'
+
+export function getVoicePrimaryAction(session: FeedbackSession | null): VoicePrimaryAction {
+  if (!session || session.lessonCount === 0) return 'save'
+  if (session.failedSegmentCount > 0) return 'retry'
+  if (session.processingSegmentCount > 0) return 'processing'
+  return session.needsGeneration ? 'generate' : 'save'
+}
+
+export function getVoicePrimaryActionText(
+  action: VoicePrimaryAction,
+  failedSegmentCount = 0
+): string {
+  if (action === 'retry') return `重试转录（${failedSegmentCount}）`
+  if (action === 'processing') return '转录中'
+  if (action === 'generate') return '生成反馈'
+  return '保存反馈'
+}
+
+export function getFailedVoiceSegments(session: FeedbackSession): VoiceAudioSegment[] {
+  return session.lessons.flatMap((lesson) =>
+    lesson.segments.filter((segment) => segment.status === 'failed')
+  )
+}
+
+export function getVoiceFailureHint(session: FeedbackSession): string {
+  const failedSegments = getFailedVoiceSegments(session)
+  const hasNoClearSpeech = failedSegments.some((segment) => {
+    const message = segment.errorMessage?.toLowerCase() || ''
+    return message.includes('no clear speech') || message.includes('未识别到清晰语音')
+  })
+  const count = session.failedSegmentCount
+  if (hasNoClearSpeech) {
+    return `${count}段录音未识别到清晰语音，可能是录音过短、静音或环境噪声较大。可重试，或放弃后重新录制。`
+  }
+  return `${count}段录音转录失败，可重试，或放弃后重新录制。`
+}