NXT-18280: SecondaryLabel on ImageItem

[dan-ichim-lgp]

Checklist

• I have read and understand the contribution guide
• A CHANGELOG entry is included
• At least one test case is included for this feature or bug fix
• I have run automated testing and it is passed
• Documentation was added or is not needed
• This is an API breaking change

Issue Resolved / Feature Added

Added secondaryLabel prop to limestone/ImageItem so ImageItem can show a second description line under label (same pattern as limestone/Card), for horizontal and vertical orientations.

Resolution

secondaryLabel renders as an additional Marquee line using the existing label styles (ellipsis / marquee on hover), is included in the default aria-label, and is accounted for in fullImage and async placeholders.
This enables a two-line secondary caption under the primary caption without changing existing label behavior. Empty sampler values are omitted so the line is not rendered unintentionally.

Additional Considerations

Links

NXT-18280

Comments

Enact-DCO-1.0-Signed-off-by: Dan Ichim (dan.ichim@lgepartner.com)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.69%. Comparing base (e64492a) to head (cc5ff71).
⚠️ Report is 1 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #415   +/-   ##
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  Coverage    82.68%   82.69%           
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  Files          153      153           
  Lines         7624     7627    +3     
  Branches      2320     2322    +2     
========================================
+ Hits          6304     6307    +3     
  Misses        1026     1026           
  Partials       294      294           

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[daniel-stoian-lgp]

1.Please add screenshot tests which include the new prop
2. please rerun ss tests after applying all the fixes