Formatting of custom fields upsell

### Reproduction Steps

1. Visit LifterLMS > Forms without LifterLMS Custom Fields activated

### Expected Behavior

Upsell formatting looks correct


### Actual Behavior

- ? is larger than normal
- Learn More is hard to read (low contrast)

<img width="1766" height="738" alt="Image" src="https://github.com/user-attachments/assets/c1ca4dde-3b38-4859-bcb3-0c4579c51ccb" />