feat: Redesign deployment strategies simulator with step-by-step approach

- Replace confusing continuous animations with clear step-by-step progression
- Users can manually step through or auto-play at 2s intervals
- Clear visual separation of v1 (blue) and v2 (green) pods
- Simple traffic flow indicator showing percentage split
- Downtime overlay for recreate strategy
- Clickable progress bar to jump to any step
- Clean pros/cons summary for each strategy
- Removed feature-toggle strategy (simplify to 4 core strategies)

Author: bobbyonmagic