fix: icon-only split-trigger inline padding to space-static-xs in one…

[ywyyu17]

…-theme

Description

Adds a one-theme-only override for the icon-only trigger button in the button-dropdown split trigger, setting its left/right padding to the$space-static-xs token (8px).

How has this been tested?

• Unit test
• Screenshot test

Review checklist

The following items are to be evaluated by the author(s) and the reviewer(s).

Correctness

• Changes include appropriate documentation updates.
• Changes are backward-compatible if not indicated, see CONTRIBUTING.md.
• Changes do not include unsupported browser features, see CONTRIBUTING.md.
• Changes were manually tested for accessibility, see accessibility guidelines.

Security

• If the code handles URLs: all URLs are validated through the checkSafeUrl function.

Testing

• Changes are covered with new/existing unit tests?
• Changes are covered with new/existing integration tests?

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.67%. Comparing base (72e7e10) to head (340cdb2).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4980   +/-   ##
=======================================
  Coverage   97.67%   97.67%           
=======================================
  Files         960      960           
  Lines       31376    31376           
  Branches    11598    11597    -1     
=======================================
  Hits        30645    30645           
- Misses        685      724   +39     
+ Partials       46        7   -39     

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[jperals]

Is the same value to be used for the button component, here?

If so, it might be better to define a custom value for the spaceButtonIconOnlyHorizontal in the One Theme style dictionary.

[ywyyu17]

Thank you so much, @jperals! These aren't the same value. After discussing with @at-susie, we
agree spaceButtonIconOnlyHorizontal is the better choice and will keep it at 6px, This change is intentionally scoped to the button-dropdown main action only, with no impact on other components.