- Updated `cards.json` and `skills.json` to trigger Berserk on damage dealt (`on_attack`) instead of on kill, adjusting descriptions accordingly.
- Modified `CombatEngine.js` to emit a `berserk` event after successful attacks and removed the previous kill-based logic.
- Enhanced `SkillProcessor.js` to apply Berserk attack power gains only when damage is dealt during an attack.
- Added `animateBerserkGain` in `CardObject.js` to visually display the ATK increase with scaling, a "+N" label, and smooth transitions.
- Overhauled `_animateAttack` in `BattleScene.js`:
- Cards now slide to the center and scale up during attacks, then return to their original positions.
- Added a "VS" image that appears between cards during the clash.
- Synchronized particle bursts, shakes, and damage numbers with the new centered animation timing.
- Integrated Berserk gain animation into the attack flow, rewinding ATK text before animating the increase.
- Added `vs.png` asset loading in `BootScene.js`.
