HelpBox visuals in the "Sprite Editor" window are not aligned with the latest style guide

Steps to reproduce:

1. Create a project
2. Go to "Assets" -> "Create" ->"2D" ->  "Sprites" -> "Triangle"
3. Select the asset to view it in the "Inspector" window
4. Click the "Open Sprite Editor" button in the "Inspector" window
5. Click the "Slice" dropdown in the "Sprite Editor" window
6. Observe the displayed help box in the window

Actual results: The icon in the help box is too big

Expected results: The icon and all the help box section should be updated to the latest UI designs

Reproducible with versions: 6000.5.0a4

Tested on (OS): macOS - Tahoe 26.1