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

該 issue 要求為 docs-sandpack skill 提供 1–2 句描述，但未指定檔案或中繼資料項目。在 repository 中定位該 skill 的定義，在適當的情況下新增描述，並驗證該 skill 現在具有可探索的描述。