"Read more" link has poor contrast in Light Mode (Preferences > AI > Assistant > Asset Knowledge)

Steps to reproduce:

1. Open Unity Editor with Light Mode theme active (Preferences > General > Editor Theme)
2. Open Preferences > AI > Assistant
3. Scroll to the "Asset Knowledge" section and observe the "Read more" hyperlink at the end of the description text

Actual results: The "Read more" link renders in a pale/light blue that has poor contrast against the light gray background, making it hard to read and identify as a clickable link.

Expected results: The "Read more" link should have sufficient contrast against the background in Light Mode, consistent with its clear visibility in Dark Mode.

Reproducible with versions: 2.17.0-pre.1 (6000.0.80f1, 6000.3.21f1, 6000.5.7f1, 6000.6.0b8, 6000.7.0a4)

Tested on (OS): MacBook Pro - Tahoe 26.5.2

Notes:

Same link style renders correctly in other places in Light Mode: The "Learn more..." links in Preferences > Asset Pipeline and Project Settings > Editor (Asset Pipeline / Accelerator Cache Server sections) use the same hyperlink pattern and render with clear, legible blue text against the light background - good contrast, easily identified as a link.