Updating system theme requires hard reboot to fix

If your theme is set to `system` and you update the theme setting, the terminal doesn't update all the colors/themes immediately.

<img width="1512" height="357" alt="Image" src="https://github.com/user-attachments/assets/b3b4ec95-2aa2-4ad3-a080-28d8f8cc8a81" />