Save icon in the AI Assistant audio Trim window has low contrast and visibility on Retina displays

Steps to reproduce:

1. Create a new project
2. Install the AI Assistant packages
3. Import the attached sound asset 
4. Select the imported audio from the Project window
5. In the Inspector, click "Trim"
6. Observe the Save icon in the Trim window

Actual results: The Save icon renders with very low contrast against the dark toolbar background, making it nearly invisible

Expected results: The Save icon should be clearly visible and have consistent contrast regardless of which display the Editor window is on

Reproducible with versions: 2.16.0-pre.1 (6000.4.0a2, 6000.5.5f1, 6000.6.0b5, 6000.7.0a3)

Not reproducible with versions: 2.16.0-pre.1 (6000.3.20f1, 6000.4.0a1)

Tested on (OS): macOS (MacBook built-in Retina XDR display) - reproducible; macOS (external display) - not reproducible

Notes:

• Seems to be Retina screen only related issue