fix(ui): 修复英雄卡牌池面板收起逻辑

1. 新增hideCardsPanel私有方法封装卡牌面板收起逻辑
2. 召唤英雄成功后自动收起卡牌池面板
3. 关闭面板按钮调用统一的收起逻辑
4. 调整初始角色控制器面板默认激活状态为关闭

assets/script/game/map/MissionCardComp.ts

@@ -797,6 +797,8 @@ export class MissionCardComp extends CCComp {
         if (heroIdx >= 0) {
             const cards = this.buildDrawCards();
             this.dispatchCardsToSlots(cards);
+            // 召唤成功后收起英雄卡池面板
+            this.hideCardsPanel();
             mLogger.log(this.debugMode, "MissionCardComp", "refresh hero pool after buy", {
                 triggerSlot: heroIdx
             });
@@ -1043,6 +1045,11 @@ export class MissionCardComp extends CCComp {
      */
     private onCloseCardsClick() {
         oops.audio.playEffect("music/button");
+        this.hideCardsPanel();
+    }
+
+    /** 隐藏卡牌面板：向下滑出到 Y=-700（不含按钮音效，供系统逻辑复用） */
+    private hideCardsPanel() {
         if (!this.cardPanNode || !this.cardPanNode.isValid) return;
         Tween.stopAllByTarget(this.cardPanNode);
         tween(this.cardPanNode)