feat(collections): sorting, empty state, and cached annotation scores on browse page

[vcnainala]

Summary

• Adds scopePublished on Collection and a published() factory state for consistent public visibility rules.
• Introduces CollectionAnnotationScores to cache per-collection average annotation_level for sort performance; cache is cleared when coconut:cache runs.
• Improves /collections browse UX:
  • Sort by release date, updated date, molecule count, annotation score, citations, organisms, geo locations, and title
  • Asc/desc toggle via arrow button (sortBy + dir URL params; default: release date, newest first)
  • Empty state when search has no matches (with clear search) or when no published collections exist

Test plan

• php artisan test --filter=CollectionListTest (7 tests)
• Visit /collections and verify default sort (release date, descending)
• Toggle sort direction and change sort field; confirm URL updates
• Search for a non-matching term and confirm empty state + clear search
• Sort by annotation score after php artisan coconut:cache in staging/production

Resolves

Closes #578

[codecov-commenter]

Codecov Report

❌ Patch coverage is 91.78082% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 7.21%. Comparing base (a4c26c6) to head (99f6074).
⚠️ Report is 4 commits behind head on development.

Files with missing lines	Patch %	Lines
app/Livewire/CollectionList.php	90.90%	4 Missing ⚠️
app/Support/CollectionAnnotationScores.php	92.59%	2 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff                @@
##             development    #797      +/-   ##
================================================
+ Coverage           6.14%   7.21%   +1.06%     
- Complexity          1736    1752      +16     
================================================
  Files                227     228       +1     
  Lines               8945    9012      +67     
================================================
+ Hits                 550     650     +100     
+ Misses              8395    8362      -33     

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