fix(expo): 暂停自动朗读后继续播放最新 TTS 片段

- usePlayer：paused 且 tts_auto 时清空队列并重置，再播当前片段
- 用 statusRef 与暂停同步，避免 WS 紧连 enqueue 时状态滞后
- 补充 use-player 单测

- api: 调整 copyright_source_pdf 脚本
- docs: 新增软著《岁月时书》软件设计说明书

Co-authored-by: Cursor <cursoragent@cursor.com>

app-expo/tests/features/voice/use-player.test.tsx

@@ -167,4 +167,44 @@ describe('usePlayer', () => {
     expect(acquire).toHaveBeenCalledTimes(2);
     expect(play).toHaveBeenCalled();
   });
+
+  test('after pause, new tts_auto clears backlog and kicks playNext', async () => {
+    mockUseAudioPlayerStatus.mockReturnValue({
+      isLoaded: true,
+      playing: false,
+      currentTime: 0.1,
+      duration: 10,
+    });
+    const pause = jest.fn();
+    const play = jest.fn();
+    mockUseAudioPlayer.mockReturnValue({ pause, play });
+
+    const { result } = renderHook(() => usePlayer());
+
+    await act(async () => {
+      await result.current.enqueue({
+        uri: 'file:///first.mp3',
+        kind: 'tts_auto',
+      });
+    });
+
+    expect(result.current.status).toBe('playing');
+    const playCountAfterFirst = play.mock.calls.length;
+
+    act(() => {
+      result.current.pausePlayback();
+    });
+    expect(result.current.status).toBe('paused');
+
+    await act(async () => {
+      await result.current.enqueue({
+        uri: 'file:///latest.mp3',
+        kind: 'tts_auto',
+      });
+    });
+
+    expect(result.current.status).toBe('playing');
+    expect(play.mock.calls.length).toBeGreaterThan(playCountAfterFirst);
+    expect(result.current.currentSource).toBe('file:///latest.mp3');
+  });
 });