- completely redesign blackjack UI with modern aesthetics

- implement responsive layout with mobile support
- add betting system with chips and bank management
- improve card visualization with realistic card faces
- add game statistics tracking (wins, losses, pushes, blackjacks)
- implement proper animations for card dealing and actions
- add basic strategy advice for players
- create rules modal with game instructions
- add keyboard shortcuts for game actions
- implement streak counter and session statistics

Author: TobiasMue91