Website is scrolling horizontally

### Description

The website scrolls horizontally when the right sidebar is gone. I guess w-full or flex-1 would solve this hopefully.

<img width="1215" alt="Image" src="https://github.com/user-attachments/assets/ca7c0e23-0243-4a1f-a7e3-f2898443d820" />

### AI SDK Version

_No response_