Need light theme for the comment section

<img width="882" height="590" alt="Image" src="https://github.com/user-attachments/assets/a2132b63-2ac5-4dca-92ef-3c38a4d73e41" />

Currently, the comment section only supports dark mode; need light mode as well.

Also need to fix this issue: https://github.com/comfyanonymous/ComfyUI/issues/8978