fix: code review fixes for feat 优化文档 增加css使用

[Copilot]

Code review of commit 2714f97 (feat: 优化文档，增加css使用) identified duplicated utility logic, a typo in an exported function name, a dead/malformed regex, stale commented-out code, and a debug trigger comment.

Changes

• Extract shared utility: convertCssVarFormat was defined identically in both compiler files; moved to packages/website-build/src/utils/index.ts and imported where needed
• Fix function name typo: genCompnentsCSSVariablesMd → genComponentsCSSVariablesMd in compile-components-css-variables-md.ts and its caller compile-doc-md.ts
• Remove dead regex: /\$\(,/ in regexpList matches the literal string $(, — unreachable and unintentional given the preceding /\$(.+)/ already covers the general $var case
• Remove dead commented-out code: Cleaned up 3 alternative implementations left in comments inside compile-components-css-variables-md.ts
• Remove debug trigger comment: // 触发 main 分支 docs 更新 23 in example/app.ts — triggering CI via comment bumps is fragile and should not persist in source

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

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• https://api.github.com/repos/didi/mpx-cube-ui/commits/2714f9749b4a549b947e08b4fd20bcefe74b3156
  • Triggering command: /home/REDACTED/work/_temp/ghcca-node/node/bin/node /home/REDACTED/work/_temp/ghcca-node/node/bin/node --enable-source-maps /home/REDACTED/work/_temp/copilot-developer-action-main/dist/index.js (http block)

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