fix: fix the issue of failed verification when content is cssvar

[kimteayon]

修复当 css 的 content 为 cssvar时 的报错问题：

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[gemini-code-assist]

Summary of Changes

Hello @kimteayon, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

此拉取请求修复了CSS Linter中的一个错误，该错误导致使用CSS变量的 content 属性值被错误地标记为无效。通过此更改，Linter将能够正确识别CSS变量语法，从而防止误报验证错误，并提高Linter对现代CSS实践的准确性。

Highlights

• 修复CSS content 属性验证问题: 解决了当CSS content 属性的值为CSS变量（例如 var(--my-var)）时，验证失败的错误。
• 更新 contentQuotesLinter.ts: 在 src/linters/contentQuotesLinter.ts 中添加了一个新的正则表达式 !/^var\(--[a-zA-Z0-9_-]+\)$/.test(${value})，以正确识别和允许 content 属性中的CSS变量语法。

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.53%. Comparing base (02d35a3) to head (4324dbb).
⚠️ Report is 1 commits behind head on next.

Additional details and impacted files

@@           Coverage Diff           @@
##             next     #235   +/-   ##
=======================================
  Coverage   94.53%   94.53%           
=======================================
  Files          32       32           
  Lines        2817     2818    +1     
  Branches      444      445    +1     
=======================================
+ Hits         2663     2664    +1     
  Misses        154      154           

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[gemini-code-assist]

Code Review

本次 PR 修复了当 CSS content 属性值为 CSS 变量时，linter 错误报警的问题。修改是有效的，但我建议对正则表达式进行改进，使其更严格地遵循 CSS 自定义属性的命名规范，并移除一处多余的模板字符串用法。这将提高代码的健壮性和可读性。