fix(TextEllipsis): calculate the width of the action slot correctly

[inottn]

fix #12991 fix #12958

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 90.47619% with 4 lines in your changes missing coverage. Please review.

Project coverage is 89.72%. Comparing base (fcd757f) to head (fdae3b7).
Report is 5 commits behind head on main.

Files	Patch %	Lines
packages/vant/src/text-ellipsis/TextEllipsis.tsx	90.47%	2 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #13005      +/-   ##
==========================================
+ Coverage   89.64%   89.72%   +0.08%     
==========================================
  Files         257      257              
  Lines        6979     6986       +7     
  Branches     1719     1722       +3     
==========================================
+ Hits         6256     6268      +12     
+ Misses        384      379       -5     
  Partials      339      339              

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[chenjiahan]

Nice 👍🏻