Help box displayed in the "AI Assistant" window does not meet latest U6.5 designs

Steps to reproduce:

1. Create a Unity project
2. Click the "AI" button
3. When the installation is complete, open the Assistant
4. Review the help boxes

Actual results: The icons are too big

Expected results: The icons should be adjusted to a new U6.5 help box design

Reproducible with versions: 1.6.0-pre.3(6000.5.0a7)

Not reproducible with versions: -

Tested on (OS): macOS - Tahoe 26.3