"Sort By..." icon is not visible in the "Create new Shader Graph Asset" window in the Light Editor theme

Steps to reproduce:

1. Create a new Unity project
2. Select "Light" Unity theme (Unity > Settings > General > Editor Theme)
3. Open the "Create new Shader Graph Asset" window (Console window > right click > Create > Shader Graph > From Template...)
4. Observe the "Sort By..." section

Actual results: Sort icon is not visible

Expected results: Sort icon should be visible (should be adjusted to a Light Editor theme)

Reproducible with versions: 6000.5.0a5

Not reproducible with versions: 6000.5.0a4

Tested on (OS): macOS - Tahoe 26.2