- Update useFlashOnIncrease default duration from 700ms to 1400ms - Update CSS count-flash-bg animation duration to 1400ms - Update test assertions to match new 1400ms duration
- Create useFlashOnIncrease hook to detect count increases - Wire useFlashOnIncrease hook into Column component - Add CSS flash animation keyframes and styles - Add unit tests for useFlashOnIncrease hook - Add Column component flash behavior tests