build: minify CSS in build bundle

[kyubisation]

This PR configures Vite to minify CSS in our build bundle. This should reduce the payload both for our package and our consumers.

[codecov-commenter]

Codecov Report

Attention: 56 lines in your changes are missing coverage. Please review.

Comparison is base (638977d) 92.61% compared to head (6f09596) 95.98%.
Report is 54 commits behind head on master.

Files	Patch %	Lines
src/components/core/dom/breakpoint.ts	42.85%	4 Missing ⚠️
src/components/card/card-action/card-action.ts	70.00%	3 Missing ⚠️
src/components/core/dom/dataset.ts	25.00%	3 Missing ⚠️
src/components/core/dom/host-context.ts	40.00%	3 Missing ⚠️
src/components/header/header/header.ts	50.00%	3 Missing ⚠️
src/components/tooltip/tooltip/tooltip.ts	25.00%	3 Missing ⚠️
src/components/calendar/calendar.ts	75.00%	2 Missing ⚠️
src/components/core/dom/find-referenced-element.ts	60.00%	2 Missing ⚠️
src/components/menu/menu/menu.ts	0.00%	2 Missing ⚠️
.../navigation/navigation-marker/navigation-marker.ts	50.00%	2 Missing ⚠️
... and 25 more

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2216      +/-   ##
==========================================
+ Coverage   92.61%   95.98%   +3.37%     
==========================================
  Files          53      326     +273     
  Lines        2409    38960   +36551     
  Branches      254     2191    +1937     
==========================================
+ Hits         2231    37396   +35165     
- Misses        176     1519    +1343     
- Partials        2       45      +43     

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[jeripeierSBB]

LGTM