fix(pkg): fix main path

[BuptStEve]

🤔 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

package.json 中的 main 路径写错了，应该是 lib/index.js

💡 需求背景和解决方案

📝 更新日志

• fix(组件名称): 处理问题或特性描述 ...

• 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

[codecov-commenter]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (02b774b) 6.93% compared to head (f69b5bb) 6.93%.
Report is 6 commits behind head on develop.

Files	Patch %	Lines
src/tabs/Tabs.tsx	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           develop    #371      +/-   ##
==========================================
- Coverage     6.93%   6.93%   -0.01%     
==========================================
  Files          400     400              
  Lines         4241    4242       +1     
  Branches       990     991       +1     
==========================================
  Hits           294     294              
- Misses        3947    3948       +1     

☔ View full report in Codecov by Sentry.
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[github-actions]

[anlyyao]

额外处理在 #384