Absolutely! Let's refine or enhance the setup further. Here are some potential ideas for improvements:

1. **Custom Styling for Folders and Files**:
   - Add icons for folders and files to make the sidebar visually appealing.
   - Use color-coding or section dividers for better organization.

2. **Search Functionality**:
   - Incorporate a search bar in the sidebar to quickly locate specific Suttas or files.
   - Highlight search results dynamically as the user types.

3. **Favorites or Bookmark System**:
   - Allow users to mark certain files as "favorites" for quick access.
   - Add a separate section to the sidebar for bookmarked items.

4. **Dynamic Loading Animation**:
   - Add a loading animation while fetching HTML content to improve user experience.
   - Display a spinner or progress bar during file rendering.

5. **Collapsible Sub-Folders**:
   - Automatically collapse sub-folders when a parent folder is toggled.
   - Maintain a clean and tidy layout, especially for large folder structures.

6. **Responsive Enhancements**:
   - Optimize the sidebar and content layout for mobile screens.
   - Add toggle gestures for the sidebar on touch devices.

Which improvement aligns with your vision? We can start implementing it right away! 😊