chore: downgrade lightningcss.

[knightedcodemonkey]

Avoid the issues reported by:

• Regression in v1.30.2? "Error: failed to deserialize; expected an object-like struct named Specifier, found ()" parcel-bundler/lightningcss#1081
• Stylesheet visitor fails when using custom properties in 1.30.2 parcel-bundler/lightningcss#1065
• mixin and apply in the official document is not working parcel-bundler/lightningcss#1071

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.27%. Comparing base (20c224e) to head (9694265).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #63   +/-   ##
=======================================
  Coverage   93.27%   93.27%           
=======================================
  Files          14       14           
  Lines        4105     4105           
  Branches      738      738           
=======================================
  Hits         3829     3829           
  Misses        249      249           
  Partials       27       27           

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[Copilot]

Pull request overview

This PR downgrades the lightningcss dependency from version 1.30.2 to 1.30.1 to avoid issues reported in the upstream lightningcss repository. The @knighted/css package version is bumped from 1.1.0-rc.4 to 1.1.0-rc.5 to reflect this change.

Changes:

• Downgraded lightningcss dependency from ^1.30.2 to ^1.30.1 in the css package
• Bumped @knighted/css version from 1.1.0-rc.4 to 1.1.0-rc.5
• Updated the playwright package to use the new @knighted/css version

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated no comments.

File	Description
packages/css/package.json	Bumped package version to rc.5 and downgraded lightningcss to 1.30.1
packages/playwright/package.json	Updated @knighted/css dependency to match new rc.5 version
package-lock.json	Updated lockfile entries for lightningcss 1.30.1 and all platform-specific binaries

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