perf: replace css-tree with @projectwalace/css-parser

[bartveneman]

changes:

• TODO: reduces install size from 2MB+ to ~170kB
• TODO: benchmark how much faster it is now
• TOO: benchmark how much less memory it uses

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (24d4115) to head (87bcc61).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #138   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines          298       332   +34     
  Branches        94       114   +20     
=========================================
+ Hits           298       332   +34     

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[codecov]

Bundle Report

Changes will increase total bundle size by 1.56kB (8.65%) ⬆️⚠️, exceeding the configured threshold of 5%.

Bundle name	Size	Change
formatCss-esm	8.31kB	1.56kB (23.18%) ⬆️⚠️

Affected Assets, Files, and Routes:

view changes for bundle: formatCss-esm

Assets Changed:

Asset Name	Size Change	Total Size	Change (%)
format-*.js	1.56kB	8.31kB	23.18% ⚠️

Files in format-*.js:

• ./index.ts → Total Size: 14.23kB