Steps to reproduce:
1. Create new Unity project
2. Set Editor theme to Light
3. In Hierarchy window create Cube GO
4. Create Timeline for a Cube GO and open Timeline window
5. In Timeline window press “+” and add “Activation Track”
6. Select Cube GO
7. Observe the “!” Warning icon

Actual results: “!” Warning icon is difficult to see in Activation Track when Editor theme is set to Light
Expected results: “!” Warning icon should be adapted for Light Editor theme to be visible in Activation Track

Reproducible with versions: 1.8.9 (6000.0.60f1, 6000.2.9f1, 6000.3.0b7, 6000.4.0a3)

Tested on (OS): macOS Silicon, Tahoe 26.0 (M1)