refactor: 优化战斗流程与英雄死亡处理逻辑

1. 移除HeroAttrsComp中多余的空行
2. 修改英雄死亡处理：直接销毁实体而非移至墓地
3. 调整波次更迭逻辑：直接进入BattleStart而非PrepareStart
4. 简化fight_ready方法：移除死亡英雄复活入场逻辑
5. 调整抽卡面板与卡牌池逻辑：战斗阶段保留抽卡面板且仅刷英雄卡
6. 将enterPreparePhase改为public方法

assets/script/game/map/MissionCardComp.ts

@@ -432,13 +432,6 @@ export class MissionCardComp extends CCComp {
     private onUseHeroCard(event: string, args: any) {
         const payload = args ?? event;
         if (!payload) return;
-        
-        if (this.isBattlePhase) {
-            payload.cancel = true;
-            payload.reason = "battle_phase";
-            oops.gui.toast("战斗阶段无法召唤英雄");
-            return;
-        }
 
         const current = this.getAliveHeroCount();
         this.syncMissionHeroData(current);
@@ -671,16 +664,10 @@ export class MissionCardComp extends CCComp {
     private enterBattlePhase() {
         if (!this.cards_node || !this.cards_node.isValid) return;
         this.initCardsPanelPos();
-        // 战斗阶段不再隐藏抽卡面板
-        // Tween.stopAllByTarget(this.cards_node);
-        // tween(this.cards_node)
-        //     .to(this.cardsPanelMoveDuration, { scale: this.cardsHideScale })
-        //     .call(() => {
-        //         if (this.cards_node && this.cards_node.isValid) {
-        //             this.cards_node.active = false;
-        //         }
-        //     })
-        //     .start();
+        // 战斗阶段抽卡面板不再收起
+        this.cards_node.active = true;
+        Tween.stopAllByTarget(this.cards_node);
+        this.cards_node.setScale(this.cardsShowScale);
 
         this.cachedHInfoComps.forEach(comp => {
             if (comp && comp.isValid) {
@@ -693,7 +680,8 @@ export class MissionCardComp extends CCComp {
     private buildDrawCards(): CardConfig[] {
         let targetType: CardType | CardType[] | undefined = undefined;
         if (this.isBattlePhase) {
-            targetType = CardType.Skill;
+            // 战斗阶段只刷英雄卡牌，不刷其他卡牌
+            targetType = CardType.Hero;
         } else {
             targetType = [CardType.Hero, CardType.SpecialRefresh];
         }