feat: 优化聊天导出进度与媒体处理

1. 拆分读取、解析、转写、媒体处理、写入和压缩阶段，完善任务进度展示。

2. 增量导出复用语音资源与转写结果，并为缺失转写补充识别。

3. 稳定远程头像文件名并保留同源头像版本更新。

4. 支持音频附件直接播放、新窗口打开附件，并解码分享标题 XML 实体。

5. 补充导出进度、语音、头像、附件和消息解析回归测试。

tests/component/export-preview-panel.test.tsx

@@ -0,0 +1,73 @@
+import { render, screen } from '@testing-library/react'
+import { describe, expect, it, vi } from 'vitest'
+import { ExportPreviewPanel } from '../../src/renderer/src/components/export/ExportPreviewPanel'
+
+const baseProps = {
+  status: 'running' as const,
+  previewItems: [],
+  previewMediaCount: 0,
+  previewBytes: 0,
+  selfInfo: null,
+  selectedCount: 1,
+  jobId: 'fixture-job',
+  onCancel: vi.fn(),
+  onReveal: vi.fn()
+}
+
+describe('export progress panel', () => {
+  it('shows an indeterminate bar while the first message scan is still at zero', () => {
+    render(
+      <ExportPreviewPanel
+        {...baseProps}
+        progress={{
+          jobId: 'fixture-job',
+          phase: 'reading',
+          processed: 0,
+          percent: 0
+        }}
+        includeVoiceTranscripts={false}
+        zip={false}
+      />
+    )
+
+    const progressbar = screen.getByRole('progressbar', { name: '导出进度' })
+    expect(progressbar).toHaveClass('indeterminate')
+    expect(progressbar).not.toHaveAttribute('aria-valuenow')
+    expect(progressbar).toHaveAttribute('aria-valuetext', '正在读取消息')
+  })
+
+  it('adds voice transcription and ZIP stages only for an export that uses them', () => {
+    render(
+      <ExportPreviewPanel
+        {...baseProps}
+        progress={{
+          jobId: 'fixture-job',
+          phase: 'transcribing',
+          processed: 3,
+          total: 8,
+          percent: 31
+        }}
+        includeVoiceTranscripts
+        zip
+      />
+    )
+
+    expect(screen.getAllByRole('listitem').map((item) => item.textContent)).toEqual([
+      '准备导出',
+      '分批读取聊天记录',
+      '解析消息内容',
+      '语音转文字',
+      '处理媒体资源',
+      '生成档案',
+      '压缩 ZIP'
+    ])
+    expect(screen.getByText('语音转文字')).toHaveClass('current')
+    expect(screen.getByText('解析消息内容')).toHaveClass('done')
+    expect(screen.getByText('处理媒体资源')).not.toHaveClass('done', 'current')
+    expect(screen.getByText('正在转写语音 3/8... 31%')).toBeVisible()
+
+    const progressbar = screen.getByRole('progressbar', { name: '导出进度' })
+    expect(progressbar).toHaveAttribute('aria-valuenow', '31')
+    expect(progressbar.querySelector('span')).toHaveStyle({ width: '31%' })
+  })
+})

tests/component/export-task-center.test.tsx

@@ -22,8 +22,9 @@ describe('export task center', () => {
         tasks={[
           {
             jobId: 'failed-export',
-            contactId: 'fixture',
-            contactName: '脱敏会话',
+            targetIds: ['fixture'],
+            targetNames: ['脱敏会话'],
+            targetLabel: '脱敏会话',
             format: 'html',
             status: 'failed',
             progress: {
@@ -41,7 +42,9 @@ describe('export task center', () => {
       />
     )
 
-    expect(screen.getByText('EPERM: operation not permitted, copyfile')).toBeInTheDocument()
+    expect(
+      screen.getByText('失败原因：EPERM: operation not permitted, copyfile')
+    ).toBeInTheDocument()
     await userEvent.click(screen.getByRole('button', { name: '复制日志' }))
 
     expect(writeText).toHaveBeenCalledOnce()

tests/component/export-voice-transcript.test.tsx

@@ -40,11 +40,15 @@ describe('export voice transcripts', () => {
             type: 'user'
           }
         ]}
-        selectedContact={null}
-        previewMessages={[]}
+        initialContact={{
+          m_nsUsrName: 'filehelper',
+          m_nsNickName: '文件传输助手',
+          md5: 'fixture-contact',
+          type: 'user'
+        }}
         selfInfo={null}
         dbReady
-        onSelectContact={vi.fn()}
+        loadPreviewMessages={vi.fn().mockResolvedValue([])}
         onOpenSettings={vi.fn()}
         exportTasks={[]}
         onStartExport={onStartExport}

tests/component/export-workspace.test.tsx

@@ -29,6 +29,7 @@ describe('ExportWorkspace multi-chat selection', () => {
       configurable: true,
       value: {
         onExportProgress: vi.fn(() => vi.fn()),
+        getVoiceModelStatus: vi.fn().mockRejectedValue(new Error('fixture model unavailable')),
         getGroupSnapshot: vi.fn(async () => ({ members: [] })),
         cancelExport: vi.fn(async () => ({ success: true })),
         revealExport: vi.fn(async () => ({ success: true }))