[Bug] Custom BG colors not working

I've turned on the custom background setting and changed the background color, but it didn't change anywhere.

<img width="1600" height="720" alt="Image" src="https://github.com/user-attachments/assets/159bfeac-e2f6-4aa5-8805-475b02401a45" />
<img width="1600" height="720" alt="Image" src="https://github.com/user-attachments/assets/890b27b2-1d34-4355-a426-19214e92110c" />