Custom portraits don't work properly in story mode

Likely because of the extra dialogue poses in story mode, custom portraits appear with the wrong offset. The simplest solution may be to just disable character/track overrides when in story mode.

<img width="1282" height="752" alt="Image" src="https://github.com/user-attachments/assets/05197dfe-5b12-436f-ab67-dcb6df1d03ad" />