ux: light theme icon colors

[setchy]

📝 Provide a description of the new feature

When using the light theme, the gray icon colors seem a bit too light.

These could be made one or two shades darker to improve the UX and match that of the GitHub web interface

➕ Additional Information

No response

[setchy]

This is only noticeable when the setting Use GitHub-like state colors is enabled. When this is disabled, the default color is more friendly