fix: 修复导出日期、语音和联系人名字问题

- 导出的 HTML：点月份先看日期，选中日期后才跳到对应消息。
- 语音转文字：不同账号、不同聊天里的语音不会再串到一起。
- 联系人名字：正常昵称显示不变；昵称异常时使用可见的备注或账号，导出文件名也能正常使用。

tests/unit/voice-service.test.ts

@@ -51,4 +51,66 @@ describe('VoiceService batch lookup', () => {
     expect(resolveVoice).toHaveBeenNthCalledWith(1, 'session', 10, 100, '1000')
     expect(resolveVoice).toHaveBeenNthCalledWith(2, 'session', 11, 101, '1001')
   })
+
+  it('keeps same local ids isolated by session and server identity, then reuses the exact cache entries', async () => {
+    const getVoiceDataBatch = vi
+      .fn()
+      .mockResolvedValue([
+        { success: true, hex: '0102' },
+        { success: true, hex: '0304' },
+        { success: true, hex: '0506' }
+      ])
+    const service = new VoiceService({ getVoiceDataBatch } as never, '/accounts/fixture-a')
+    const decoder = (service as unknown as {
+      decoderRegistry: { decode: ReturnType<typeof vi.fn> }
+    }).decoderRegistry
+    vi.spyOn(decoder, 'decode').mockImplementation(async (source: { data: Buffer }) => ({
+      pcm: Buffer.from([source.data[0]]),
+      sampleRate: 16_000,
+      channels: 1
+    }))
+
+    const references = [
+      { sessionId: 'session-a', localId: 7, createTime: 100, svrId: 'same-second-a' },
+      { sessionId: 'session-b', localId: 7, createTime: 100, svrId: 'same-second-a' },
+      { sessionId: 'session-a', localId: 7, createTime: 100, svrId: 'same-second-b' }
+    ]
+    const first = await service.resolveVoices(references)
+    expect(first.every((item) => item.success)).toBe(true)
+    expect(new Set(first.map((item) => item.data)).size).toBe(3)
+    expect(getVoiceDataBatch).toHaveBeenCalledOnce()
+
+    const second = await service.resolveVoices(references)
+    expect(second).toEqual(first)
+    expect(getVoiceDataBatch).toHaveBeenCalledOnce()
+  })
+
+  it('versions the in-memory namespace per account so a restarted or switched account cannot reuse old audio', async () => {
+    const client = {
+      getVoiceDataBatch: vi.fn().mockResolvedValue([{ success: true, hex: '0102' }]),
+      getAccountRoot: () => '/accounts/fixture-a'
+    }
+    const first = new VoiceService(client as never)
+    const second = new VoiceService(
+      { ...client, getAccountRoot: () => '/accounts/fixture-b' } as never
+    )
+    const decode = (service: VoiceService, value: number): void => {
+      const decoder = (service as unknown as {
+        decoderRegistry: { decode: ReturnType<typeof vi.fn> }
+      }).decoderRegistry
+      vi.spyOn(decoder, 'decode').mockResolvedValue({
+        pcm: Buffer.from([value]),
+        sampleRate: 16_000,
+        channels: 1
+      })
+    }
+    decode(first, 1)
+    decode(second, 2)
+    const firstCache = (first as unknown as { voiceCache: Map<string, string> }).voiceCache
+    const secondCache = (second as unknown as { voiceCache: Map<string, string> }).voiceCache
+    await expect(first.resolveVoices([{ sessionId: 'session', localId: 1, createTime: 2 }])).resolves.toHaveLength(1)
+    await expect(second.resolveVoices([{ sessionId: 'session', localId: 1, createTime: 2 }])).resolves.toHaveLength(1)
+    expect([...firstCache.keys()][0]).not.toBe([...secondCache.keys()][0])
+    expect(client.getVoiceDataBatch).toHaveBeenCalledTimes(2)
+  })
 })