feat(combat): skip skill resolution for cards with active delay

Adds a check in `CombatEngine.js` to prevent cards with `currentDelay > 0` from resolving their `preBattle` skills. This ensures that delayed units do not trigger abilities until their delay counter has expired.

src/combat/CombatEngine.js

@@ -380,6 +380,7 @@ export class CombatEngine {
     const liveEnemies = enemies.filter(c => c.currentHP > 0);
     for (const card of cards) {
       if (card.currentHP <= 0) continue;
+      if (card.currentDelay > 0) continue;
       for (const s of card.skills) {
         if (s.trigger !== 'preBattle') continue;
         // For drain, resolve the card directly across as defender