chore: update popup demo

[uyarn]

🤔 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

• [t-popup] 给popup 的overlayStyle属性设置等宽初始化未生效 #1378

💡 需求背景和解决方案

📝 更新日志

• chore: 调整popup调整结构之后的demo

• chore: select新增无边框自适应宽度示例

• 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

Merging #1380 (115d14c) into develop (492d477) will increase coverage by 0.06%.
The diff coverage is 68.38%.

@@             Coverage Diff             @@
##           develop    #1380      +/-   ##
===========================================
+ Coverage    57.94%   58.00%   +0.06%     
===========================================
  Files          407      415       +8     
  Lines        15371    15520     +149     
  Branches      2931     2945      +14     
===========================================
+ Hits          8907     9003      +96     
- Misses        6187     6246      +59     
+ Partials       277      271       -6     

Impacted Files	Coverage Δ
src/button/props.ts	84.61% <0.00%> (-15.39%)	⬇️
src/calendar/const.ts	100.00% <ø> (ø)
src/cascader/cascader.tsx	64.00% <ø> (ø)
src/color-picker/color-picker.tsx	81.25% <ø> (ø)
src/color-picker/panel/header.tsx	69.56% <ø> (-1.27%)	⬇️
src/date-picker/base/Header.tsx	7.57% <0.00%> (-0.37%)	⬇️
src/date-picker/date-picker-panel-props.ts	100.00% <ø> (+90.00%)	⬆️
src/date-picker/date-range-picker-panel-props.ts	100.00% <ø> (+90.90%)	⬆️
src/date-picker/date-range-picker-props.ts	42.85% <0.00%> (-11.69%)	⬇️
src/date-picker/hooks/useRange.ts	35.89% <ø> (ø)
... and 177 more

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