test coverage | add visual test for the donation modal

[NoamGaash]

while there is some coverage for the pages, we didn't implement (yet) any visual test coverage for modals, popups and so on.

You can help us by writing a test that opens the donations modal and takes a visual checkpoint of it (eyes.check("donation modal", Target.region('#modal')) or something like that)

Bonus - add a test for the dark mode version