fix(sheet): button class priority

[siam-ese]

close #1116

Other styling issues have been fixed, with the exception of this button styling issue.

Pull Request Checklist

• Related tickets or issues have been linked in the PR description (or missing issue).
• Naming convention is followed (do please check it especially when you created new plugins, commands and resources).
• Unit tests have been added for the changes (if applicable).
• Breaking changes have been documented (or no breaking changes introduced in this PR).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 27.15%. Comparing base (74d185a) to head (7e22880).
Report is 26 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #2485      +/-   ##
==========================================
+ Coverage   27.10%   27.15%   +0.04%     
==========================================
  Files        1653     1654       +1     
  Lines       83306    83330      +24     
  Branches    17256    17258       +2     
==========================================
+ Hits        22584    22626      +42     
+ Misses      60722    60704      -18     

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