Add Gender filter and active filter indicators to Horses grid

[ovation22]

Summary

• Added Gender filter dropdown (All/Male/Female) to the Gender column options menu
• Implemented active filters summary bar displaying all applied filters as removable badges
• Each filter badge includes an individual clear button for quick removal
• Added "Clear All" button to reset all filters at once
• Gender filter integrates with existing AND/OR filter operator logic

Technical Details

• Gender filter uses IsMale field with FilterOperator.Eq for boolean comparison
• Filter state managed via bool? genderFilter for tri-state (null/true/false)
• Active filters bar only displays when filters are active (HasActiveFilters())
• Maintains existing debounce behavior for text-based filters
• Column headers remain clickable for sorting and filter menu access

Test Plan

• Verify Gender dropdown filters horses correctly (Male/Female/All)
• Confirm active filters bar displays when any filter is applied
• Test individual filter clear buttons
• Test "Clear All" button removes all filters
• Verify column headers remain clickable for sorting
• Confirm filter integration with AND/OR operator logic

[github-actions]

Test Results

723 tests  ±0   723 ✅ ±0   6s ⏱️ ±0s
  1 suites ±0     0 💤 ±0 
  1 files   ±0     0 ❌ ±0 

Results for commit d7298fe. ± Comparison against base commit 0efae32.