fix(a11y): Row Detail missing aria-expanded attribute for accessibility

[ghiscoding]

Summary

Two a11y gaps in the Row Detail plugin that match the pattern already established in Tree Data and Grouping:

1. No aria-expanded on the toggle icon in detailSelectionFormatter
2. No keyboard handler — Tree Data and Grouping both subscribe onKeyDown with Space (toggle), ArrowRight (expand), ArrowLeft (collapse) + editor-lock guard

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.0%. Comparing base (4dff5d6) to head (6cb5ba8).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2656   +/-   ##
=======================================
  Coverage   100.0%   100.0%           
=======================================
  Files         200      200           
  Lines       25330    25345   +15     
  Branches     8954     8960    +6     
=======================================
+ Hits        25330    25345   +15     

Flag	Coverage Δ
angular	100.0% <ø> (ø)
universal	100.0% <100.0%> (ø)

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commit: 6cb5ba8