Bug description

When using dark mode, charts are rendered without visible axis labels and other chart text elements. This appears to be due to the labels not switching to a lighter color (e.g., white), making them effectively invisible against the dark background.

Steps to Reproduce

• Switch to dark mode.
• Open any chart (e.g., bar chart, line chart, etc.).

Screenshots/recordings

Superset version

master / latest-dev

Python version

3.11

Node version

18 or greater

Browser

Chrome

Additional context

No response

Checklist

• I have searched Superset docs and Slack and didn't find a solution to my problem.
• I have searched the GitHub issue tracker and didn't find a similar bug report.
• I have checked Superset's logs for errors and if I found a relevant Python stacktrace, I included it here as text in the "additional context" section.