fix minification issue with non-optional spaces in at-rule preludes

[bartveneman]

No description provided.

[codecov]

Bundle Report

Changes will increase total bundle size by 123 bytes (0.72%) ⬆️. This is within the configured threshold ✅

Detailed changes

Bundle name	Size	Change
formatCss-esm	14.35kB	123 bytes (0.86%) ⬆️

Affected Assets, Files, and Routes:

view changes for bundle: formatCss-esm

Assets Changed:

Asset Name	Size Change	Total Size	Change (%)
index.js	123 bytes	12.83kB	0.97%

Files in index.js:

• ./src/lib/index.ts → Total Size: 12.37kB

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.82%. Comparing base (cde5e32) to head (f84971e).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #198   +/-   ##
=======================================
  Coverage   96.81%   96.82%           
=======================================
  Files           2        2           
  Lines         345      346    +1     
  Branches      125      126    +1     
=======================================
+ Hits          334      335    +1     
  Misses         10       10           
  Partials        1        1           

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