nav bar end editor needs better contrast between each other

[samuelstroschein]

Problem

The nav bar and editor seem visually too close. Both make use of a horizontal divider and no color difference between them.

Proposal

Increase visual difference by either changing the nav bar or the "editor nav bar". GitHub only uses color.

We could use surface-100 for the nav bar. I played around with surface-100, a bit too light. The hue likely needs to increase in the color system to make a meaningful difference.

[samuelstroschein]

Material uses the surface color 2 (200)

[jannesblobel]

@jannesblobel change the colour from surfaces 100-500
https://m3.material.io/styles/color/the-color-system/color-roles

[samuelstroschein]

@jannesblobel slightly darken all of them?