- Added 13 new Bloodthirsty cards (common to legendary) including Countess Vireska commander
- Implemented 4 new skills: siphon, drain, bloodpact, and bloodrage with full combat engine support
- Created Chapter 2 campaign (8 missions) with progressive difficulty and unique lore entries
- Added corresponding audio effects (bloodrage.mp3, drain.mp3, siphon.mp3) and card art assets
- Implemented visual animations for all new skills:
- Drain: projectile to primary target + splash damage to neighbors + green heal return particles
- Siphon: blood-red projectile with glow effect that heals attacker
- Bloodpact: red flash for HP loss followed by ATK gain animation (handles self-destruction)
- Bloodrage: red pulse and ATK boost display when below 50% HP
- Updated CombatEngine to handle preBattle death checks (bloodpact can kill cards immediately)
- Modified BattleScene to sequence new skill animations within the combat flow
