`kb(markdown.showPreview)` and `kb(markdown.showPreviewToSide)` are rendered as `unassigned`

`kb(markdown.showPreview)` and `kb(markdown.showPreviewToSide)` are rendered as `unassigned`

- https://code.visualstudio.com/docs/languages/markdown#_markdown-preview

<img width="620" height="774" alt="Image" src="https://github.com/user-attachments/assets/ad7810cf-d3d1-44b3-a6b1-babbde692709" />