feat(hero box): 添加英雄面板空槽位点击交互

1. 新增GameEvent.HeroBoxEmptyClick事件用于空槽位点击通知
2. 为HeroBoxComp添加空槽位节点和点击回调，播放点击动画并派发事件
3. 在MissionCardComp中注册该事件，点击时打开英雄卡池选择界面
4. 完善空槽位的显示/隐藏逻辑

assets/script/game/map/HeroBoxComp.ts

@@ -12,10 +12,11 @@
  *   - HeroInfo（heroSet）—— 英雄静态配置
  */
 import { mLogger } from "../common/Logger";
-import { _decorator, Node, Sprite, Label, resources, AnimationClip, SpriteFrame, NodeEventType, UITransform } from "cc";
+import { _decorator, Node, Sprite, Label, resources, AnimationClip, SpriteFrame, NodeEventType, UITransform, Tween, tween, Vec3 } from "cc";
 import { ecs } from "../../../../extensions/oops-plugin-framework/assets/libs/ecs/ECS";
 import { CCComp } from "../../../../extensions/oops-plugin-framework/assets/module/common/CCComp";
 import { oops } from "db://oops-framework/core/Oops";
+import { GameEvent } from "../common/config/GameEvent";
 import { HeroInfo } from "../common/config/heroSet";
 import { HeroAttrsComp } from "../hero/HeroAttrsComp";
 import { getLvColor } from "../common/config/GameSet";
@@ -47,6 +48,10 @@ export class HeroBoxComp extends CCComp {
     @property(Label)
     private level_label: Label = null;
 
+    /** 空槽位标识节点（未绑定英雄时激活，点击打开英雄卡池） */
+    @property(Node)
+    private noHero: Node = null;
+
     // ======================== 战斗信息标签（总值 + 附加值） ========================
 
     /** 攻击总值 */
@@ -159,12 +164,37 @@ export class HeroBoxComp extends CCComp {
         // 次级属性栏默认收起
         this.setMoreRowsVisible(false);
         this.more_btn?.on(NodeEventType.TOUCH_END, this.onMoreBtnClick, this);
+        // 空槽位点击 → 打开英雄卡池
+        this.noHero?.on(NodeEventType.TOUCH_END, this.onNoHeroClick, this);
     }
 
     onDestroy() {
         if (this.more_btn && this.more_btn.isValid) {
             this.more_btn.off(NodeEventType.TOUCH_END, this.onMoreBtnClick, this);
         }
+        if (this.noHero && this.noHero.isValid) {
+            this.noHero.off(NodeEventType.TOUCH_END, this.onNoHeroClick, this);
+        }
+    }
+
+    /**
+     * 空槽位点击：播放主节点点击动画，并派发事件通知 MissionCardComp 展示英雄卡池。
+     */
+    private onNoHeroClick() {
+        oops.audio.playEffect("music/button");
+        this.playClickAnim();
+        oops.message.dispatchEvent(GameEvent.HeroBoxEmptyClick);
+    }
+
+    /** 主节点点击动画：缩放按下 → 回弹 */
+    private playClickAnim() {
+        if (!this.node || !this.node.isValid) return;
+        Tween.stopAllByTarget(this.node);
+        this.node.setScale(1, 1, 1);
+        tween(this.node)
+            .to(0.06, { scale: new Vec3(0.94, 0.94, 1) })
+            .to(0.1, { scale: new Vec3(1, 1, 1) })
+            .start();
     }
 
     /** 刷新计时累计（降频刷新实时属性） */
@@ -254,6 +284,9 @@ export class HeroBoxComp extends CCComp {
         this.eid = eid;
         this.model = model;
         this.node.active = true;
+        if (this.noHero && this.noHero.isValid) {
+            this.noHero.active = false;
+        }
         this.refresh();
     }
 
@@ -264,6 +297,10 @@ export class HeroBoxComp extends CCComp {
         this.iconHeroUuid = 0;
         this.iconVisualToken += 1;
 
+        if (this.noHero && this.noHero.isValid) {
+            this.noHero.active = true;
+        }
+
         if (this.name_label && this.name_label.isValid) {
             this.name_label.string = "";
         }