- Created RunnersOnBase.vue component with split layout (runners left, catcher right)
- Created RunnerCard.vue for individual runner cards with expand-in-place functionality
- Integrated component into GamePlay.vue (mobile and desktop layouts)
- Added team color computed properties for batting/fielding teams
- Component only shows when runners on base (hasRunners computed)
- Click runner card to expand in place and show full player card + catcher matchup
- Smooth CSS transitions and animations matching pitcher/batter card style
- Includes design documentation and HTML mockup for reference
