feat(ui): gallery on mobile

[renefloor]

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• The code changes follow best practices
• Code changes are tested (add some information if not applicable)

Description of the pull request

Currently the theme studio is always put on a row, but that doesn't really fit on mobile. This adds the theme on top of the gallery using a stack when the window is very small.

Widgetbook itself already works nicely on small screens.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (main-design-system@c066cb4). Learn more about missing BASE report.

Additional details and impacted files

@@                  Coverage Diff                  @@
##             main-design-system      #38   +/-   ##
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  Coverage                      ?   40.29%           
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  Files                         ?       78           
  Lines                         ?     2040           
  Branches                      ?        0           
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  Hits                          ?      822           
  Misses                        ?     1218           
  Partials                      ?        0           

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