src
- app
  layout.tsx
  page.tsx
  globals.css
- lab
  components
  code-block.tsx
  reading-progress.tsx
  tree-view.tsx
  registry.ts
- lib
  cn.ts
public
- favicon.svg
- og.png
package.json
README.md

Tree view

Folders unfold in place while the selection glides to the file you pick.