UI Builder’s "Background" icons for Repeat Y/X, Position X/Y and Slice Type are low quality and blurry in the Inspector window

Steps to reproduce:
1. Create new Unity project
2. Open UI Builder window (Window > UI Toolkit > UI Builder)
3. Add any Visual Element and select it
4. In the UI Builder Inspector, go to Background -> Repeat
5. Observe the icons of "Repeat" options (X and Y) and well as Position-X, Position-Y, Slice Type

Actual results: Icons are blurry in Background section
Expected results: Icons are not blurry in Background section

Reproducible with versions: 6000.0.66f2, 6000.3.8f1, 6000.4.0b8, 6000.5.0a6

Tested on (OS): macOS Silicon Tahoe 26.2 (M1)

Notes:

•  Scale Mode icons are high quality and not blurry in Background section