"Search by Import Log Type" Icon Nearly Invisible in Light Theme (Project Window)

Steps to reproduce:

1. Create a new Unity project
2. Switch to the Light Theme via Edit > Preferences > General > Editor Theme
3. Observe the tab icons in the Project window (e.g., next to the Search field)

Actual results: The "Search by Import Log Type" icon appears white and is nearly invisible against the light theme

Expected results: The icon should adapt its color for proper contrast and visibility in the light theme or a different icon should be used

Reproducible with versions: 2021.3.45f1, 2022.3.62f1, 6000.0.53f1, 6000.1.12f1, 6000.2.0b10, 6000.3.0a2

Tested on (OS): macOS 15.6, Ubuntu 22.04

Note: Not reproducible on Dark Theme