Input: six synthetic Ah vowels; fourth sustained 2.5–4.5s. Auto Lyrics may reject this fixture. Preserve actual recognition outcome, optionally import the manually authored SRT as a separate editing reference.

1. 试听合成元音小样与准确文本，另备自有演唱用于识别测试
2. 打开Captions > Auto lyrics并确认当前可选语言
3. 生成歌词后逐句对照TXT，修复错词和伴奏误识别
4. 在实际可用的歌词高亮模板中检查副歌重复句
5. 针对拖长音调整时间点，手机预览检查提前跳行
6. 导出竖屏MP4与当前版支持的字幕/工程，逐句回听成片

Target account execution: not performed. Save actual output separately.
