Found broken `/preparation-for-study/app.comflowy.com` link. Please fix!

中央广场正上方的巨大显示屏因为电力不足而不停的闪烁，上面的数字正停留在

The issue reports a broken link '/preparation-for-study/app.comflowy.com' but the description is unclear and non-English. First, locate where this link appears in the repository's documentation, likely in an MDX file. Search for the link path in the codebase, verify it's broken, and correct the URL to point to the intended resource.

由索引模型根据 Issue 内容生成。