Animation Window UI: blurry Ripple Mode icon

Steps to reproduce:

1. Create a new project
2. Select any object in the "Hierarchy" window
3. Go to "Window -> Animation -> Animation"
4. Click the "Create" button
5. Enter the animation title and click the "Save" button
6. Observe the "Ripple Mode" icon quality

Actual results: The icon looks blurry and compressed

Expected results: The icon must be bright and clearly visible

Reproducible with versions: 6000.5.0a9, 6000.6.0a1

Tested on (OS): macOS - Tahoe 26.3.1