fix(comp:select): responsive maxLabel size calculation error

[sallerli1]

PR Checklist

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• The commit message follows our guidelines
• Tests for the changes have been added/updated or not needed
• Docs and demo have been added/updated or not needed

What is the current behavior?

select组件的maxlabel配置responsive时，由于容器尺寸没有减去内边距以及使用了clientWidth，而clientWidth会省略掉小数，导致实际计算结果不准确，可能出现换行的情况

What is the new behavior?

修复以上问题

Other information

[idux-bot]

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[codecov]

Codecov Report

Merging #1647 (1776e4f) into main (97bdafb) will decrease coverage by 0.04%.
The diff coverage is 72.22%.

❗ Current head 1776e4f differs from pull request most recent head 72a4e49. Consider uploading reports for the commit 72a4e49 to get more accurate results

@@            Coverage Diff             @@
##             main    #1647      +/-   ##
==========================================
- Coverage   92.62%   92.59%   -0.04%     
==========================================
  Files         345      345              
  Lines       32199    32257      +58     
  Branches     3677     3682       +5     
==========================================
+ Hits        29825    29869      +44     
- Misses       2374     2388      +14     

Files Changed	Coverage Δ
...ages/components/_private/overflow/src/Overflow.tsx	82.56% <30.76%> (-5.55%)	⬇️
packages/cdk/utils/src/dom.ts	83.02% <95.45%> (+4.05%)	⬆️
packages/components/_private/overflow/src/Item.tsx	100.00% <100.00%> (ø)
packages/components/_private/overflow/src/types.ts	100.00% <100.00%> (ø)