- Replace .border-l-4.border-gray-600 checks with .catcher-pill
- Update isExpanded prop references to isSelected
- Adjust expanded view tests for new side-by-side layout
- matchup-card-blue = runner full card
- matchup-card = catcher full card
- Fix deselection test to check isSelected prop (Transition keeps DOM during animation)
All 15 RunnersOnBase tests passing
All 16 RunnerCard tests passing
- Test empty/occupied/expanded states
- Test player name handling and initials
- Test runner selection and catcher card expansion
- Test team color integration
- All 40 tests passing
