WEBDEV-7090: Style and event updates for federated search

[latonv]

• Adjusts styling and behavior for the smart facet bar to match the latest specs.
• Emits events necessary for the parent page to respond to smart facet changes appropriately.

[github-actions]

PR Preview Action v1.6.1
Preview removed because the pull request was closed.
2025-06-12 01:44 UTC

[codecov]

Codecov Report

Attention: Patch coverage is 69.23077% with 40 lines in your changes missing coverage. Please review.

Project coverage is 92.61%. Comparing base (ace707a) to head (2e61825).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
.../collection-facets/smart-facets/smart-facet-bar.ts	57.89%	16 Missing ⚠️
src/collection-browser.ts	65.71%	12 Missing ⚠️
...ection-facets/smart-facets/smart-facet-dropdown.ts	66.66%	7 Missing ⚠️
...t-facets/heuristics/wikidata/wikidata-heuristic.ts	0.00%	4 Missing ⚠️
...llection-facets/smart-facets/smart-facet-button.ts	96.29%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #450      +/-   ##
==========================================
- Coverage   92.72%   92.61%   -0.12%     
==========================================
  Files         107      108       +1     
  Lines       17217    17303      +86     
  Branches     1349     1353       +4     
==========================================
+ Hits        15965    16025      +60     
- Misses       1192     1218      +26     
  Partials       60       60              

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