New core navigation's top bar in dark mode on small screens has white background with light grey text

Moving this to 'Needs Review' as the MR has already been created.

Reproduced the issue on local and applied MR #3.
Testing Steps:
1. Use Gin.
2. install core Navigation module.
3. size the viewport narrow enough for the sidebar to be hidden and the top bar to be displayed.

Result:-
After MR the issue resolved for the small screen.

Before MR

After MR

RTBC ++

@ambient.impact thanks! 👏

Automatically closed - issue fixed for 2 weeks with no activity.