feat: syntax highlight css in pretty reporter

[bartveneman]

• Highlight CSS
• Configurable via --highlight/--no-highlight CLI option Skipping for now, waiting until we actually need this
• Tests

Closes #53

[codecov-commenter]

Bundle Report

Changes will increase total bundle size by 1.03kB (4.08%) ⬆️. This is within the configured threshold ✅

Detailed changes

Bundle name	Size	Change
cli.js-esm	13.69kB	1.03kB (8.17%) ⬆️

Affected Assets, Files, and Routes:

view changes for bundle: cli.js-esm

Assets Changed:

Asset Name	Size Change	Total Size	Change (%)
cli.js	1.03kB	13.69kB	8.17% ⚠️

Files in cli.js:

• ./src/cli/reporters/pretty.ts → Total Size: 5.17kB

[codecov-commenter]

Codecov Report

❌ Patch coverage is 76.27119% with 14 lines in your changes missing coverage. Please review.
✅ Project coverage is 96.93%. Comparing base (124c8dd) to head (6c9364a).

Files with missing lines	Patch %	Lines
src/cli/reporters/pretty.ts	76.27%	14 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #54      +/-   ##
==========================================
- Coverage   98.32%   96.93%   -1.39%     
==========================================
  Files          14       14              
  Lines         896      947      +51     
  Branches      107      117      +10     
==========================================
+ Hits          881      918      +37     
- Misses         13       27      +14     
  Partials        2        2              

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