chore(migrate): scss use @use instead of @import

[max-nextcloud]

Gets rid of the deprecation warning.

@use is per file / style block.
I.e. it is not possible to nest it inside a css selector
like we did in Editor.vue.
However I think our css is specific enough to not apply outside the editor anyway.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 60.19%. Comparing base (c358bdf) to head (b58afe0).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7782      +/-   ##
==========================================
- Coverage   60.19%   60.19%   -0.01%     
==========================================
  Files         502      502              
  Lines       38562    38561       -1     
  Branches     1135     1135              
==========================================
- Hits        23211    23210       -1     
  Misses      15245    15245              
  Partials      106      106              

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