[Dark mode] Commit messages are black on a dark background in Graph view. Changing to white would greatly increase readability

Summary

In dark mode, the text in the Graph view is black which could be made more readable if it was lighter due to the dark background.

Steps to reproduce

1. Go to Repository -> Graph while in dark mode
2. See the Graph section, how the commit messages appear in black text on the dark background

What is the current bug behavior?

Commit messages appear black in dark mode.

What is the expected correct behavior?

Commit messages appear as white or light color in dark mode to improve readability.