Fix storybook

[nicksellen]

What does this PR do?

Storybook config has been broken with the switch to vite, etc...

This is an attempt to bring it back again!

Things to still resolve:

• our override of quasar sass variables is not working
• if vitest is imported somewhere, it does not like that... e.g. in mockBackend (commented out for now)
• ... probably some other stuff

Links to related issues

Checklist

• [ ] added a test, or explain why one is not needed/possible...
• [ ] no unrelated changes
• [ ] asked someone for a code review
• [ ] joined #karrot:matrix.org
• [ ] added an entry to CHANGELOG.md (description, pull request link, username(s))
• [ ] tried out on a mobile device (does everything work as expected on a smaller screen?)

[codecov[bot]]

Codecov Report

Merging #2669 (c9e5ea0) into master (57b942b) will increase coverage by 0.05%. The diff coverage is 19.54%.

@@            Coverage Diff             @@
##           master    #2669      +/-   ##
==========================================
+ Coverage   75.84%   75.90%   +0.05%     
==========================================
  Files         382      382              
  Lines       40952    40929      -23     
  Branches     2343     2340       -3     
==========================================
+ Hits        31060    31067       +7     
+ Misses       9892     9862      -30     

Files Changed	Coverage Δ
src/activities/components/ActivityEdit.stories.js	0.00% <0.00%> (ø)
src/activities/components/ActivityItem.stories.js	0.00% <0.00%> (ø)
src/authuser/components/Login.vue	0.00% <0.00%> (ø)
src/boot/cordova.js	0.00% <0.00%> (ø)
src/boot/loglevel.js	0.00% <0.00%> (ø)
src/boot/performance.js	39.62% <0.00%> (ø)
src/notifications/Notifications.stories.js	0.00% <0.00%> (ø)
src/notifications/components/NotificationItem.vue	0.00% <ø> (ø)
src/utils/components/markdownRenderer.js	88.29% <ø> (+1.69%)	:arrow_up:
src/utils/errors.js	21.42% <0.00%> (ø)
... and 8 more

... and 1 file with indirect coverage changes

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[nicksellen]

Merging, as it's better than the current state.