[#1924] Dark theme fixes

[SilviaAmAm]

Fixes #1924

[codecov-commenter]

Codecov Report

Base: 93.36% // Head: 93.36% // No change to project coverage 👍

Coverage data is based on head (8eb8783) compared to base (c1a4742).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2201   +/-   ##
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  Coverage   93.36%   93.36%           
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  Files         636      636           
  Lines       20390    20390           
  Branches     1898     1898           
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  Hits        19038    19038           
  Misses       1051     1051           
  Partials      301      301           

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[sergei-maertens]

• To style the checkboxes as well, you can use color-scheme: dark in CSS (https://developer.mozilla.org/en-US/docs/Web/CSS/color-scheme), that's how github does it. You can also apply that to date inputs, those are currently still "light" scheme.

• The product edit form still has light-theme WYSIWYG fields, those are rendered via the django package afaik. These should also be adapted to use the correct theme (and preferably in a generic way)

I hope one day we can also hook these things up in storybook and have automated UI regression testing 😬

[SilviaAmAm]

* The product edit form still has light-theme WYSIWYG fields, those are rendered via the django package afaik. These should also be adapted to use the correct theme (and preferably in a generic way)

I see there is this issue for it: jazzband/django-tinymce#375. I'll look into it and see if I can figure out how to make it detect the dark theme!