Add a description to improve Dispatch discoverability

Hi! Your Claude Code skill docs-sandpack has been discovered by Dispatch — a Claude Code runtime that proactively recommends tools at task shifts and intercepts when Claude picks something suboptimal — helping developers discover the best plugins, skills, and MCPs for what they're working on.

Right now your skill has no description, which limits how effectively Dispatch can recommend it. A short 1–2 sentence description of what your skill does would significantly improve its visibility.

Feel free to close this if you'd prefer not to add one — no action required. We reach out at most once per month per repository.

— The Dispatch team

该 issue 要求为 docs-sandpack skill 提供 1–2 句描述，但未指定文件或元数据条目。在 repository 中定位该 skill 的定义，在适当的情况下添加描述，并验证该 skill 现在具有可发现的描述。