fix: dark mode hides map legend

[itsoriki]

Resolves #579

Description

The map legend was kind of transparent in dark mode - I fixed it

Note: I have noticed there is a complete mess using different component libraries and configuring each one's dark mode options - the code is cumbersome - maybe we should consider sticking (strictly) with one library (and and replacing the others (e.g. MUI and not AntDesign - I have no personal preference)

screenshots

Before:

After:

[NoamGaash]

regarding your note - see #752

[github-actions[bot]]

Preview: https://s3.amazonaws.com/noam-gaash.co.il/9176665669/open-bus/441ed51ac8f25f399e08de32dc05a90fce80c569/index.html Preview Storybook: https://s3.amazonaws.com/noam-gaash.co.il/9176665669/open-bus/441ed51ac8f25f399e08de32dc05a90fce80c569/storybook/index.html