fix(theme-generator): sync colors in Shadow DOM with user-defined ones

[RylanBot]

🤔 这个 PR 的性质是？

• 日常 bug 修复
• 新特性提交
• 文档改进
• 演示代码改进
• 组件样式/交互改进
• CI/CD 改进
• 重构
• 代码风格优化
• 测试用例
• 分支合并
• 其他

🔗 相关 Issue

💡 需求背景和解决方案

1. 生成器本体的颜色和外界自定义的颜色不同步

错误版本	合理版本

2. 文本不居中

3. 类型警告

📝 更新日志

• fix(theme-generator): 确保生成器本体的颜色和外界自定义的颜色完全同步，修复部分样式和类型异常

• 本条 PR 不需要纳入 Changelog

☑️ 请求合并前的自查清单

⚠️ 请自检并全部勾选全部选项。⚠️

• 文档已补充或无须补充
• 代码演示已提供或无须提供
• TypeScript 定义已补充或无须补充
• Changelog 已提供或无须提供

[tencent-adm]

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[pkg-pr-new]

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npm i https://pkg.pr.new/Tencent/tdesign/tdesign-site-components@637

npm i https://pkg.pr.new/Tencent/tdesign/tdesign-theme-generator@637

commit: 07af0e2

[tdesign-bot]

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