fix: 修复组件销毁时事件解绑和空引用问题并添加任务界面

- 在多个组件的onDestroy方法中添加节点有效性检查，防止无效节点上解绑事件
- 修复MissionComp中任务启动逻辑，改为通过UI打开方式触发MissionStart事件
- 添加新的任务界面(UIID.Mission)及相关配置
- 修复MissionCardComp中Map未初始化导致的空引用问题
- 优化按钮事件绑定和解绑逻辑，增加空值检查

assets/script/game/map/MissionComp.ts

@@ -181,7 +181,6 @@ export class MissionComp extends CCComp {
     onLoad(){
         this.showMemoryPanel = false
         // 注册生命周期事件
-        this.on(GameEvent.MissionStart,this.mission_start,this)
         this.on(GameEvent.MissionEnd,this.mission_end,this)
         this.on(GameEvent.NewWave,this.onNewWave,this)
         this.on(GameEvent.DO_AD_BACK,this.do_ad,this)
@@ -189,8 +188,16 @@ export class MissionComp extends CCComp {
         this.removeMemoryPanel()
     }
 
+    onAdded(args: any) {
+        // UI加载完成后，抛出MissionStart事件，启动战斗（触发自身 mission_start 及其他系统）
+        oops.message.dispatchEvent(GameEvent.MissionStart, {});
+        this.mission_start();
+    }
+
     onDestroy(){
-        this.start_btn?.off(NodeEventType.TOUCH_END, this.onStartFightBtnClick, this)
+        if (this.start_btn && this.start_btn.isValid) {
+            this.start_btn.off(NodeEventType.TOUCH_END, this.onStartFightBtnClick, this);
+        }
     }
 
     /**
@@ -295,15 +302,16 @@ export class MissionComp extends CCComp {
     async mission_start(){
         this.unscheduleAllCallbacks();
         this.cleanComponents();
-        this.node.active=true
         this.data_init()
         oops.message.dispatchEvent(GameEvent.FightReady)
         this.changePhase(MissionPhase.Prepare)
-        let loading=this.node.parent.getChildByName("loading")
-        loading.active=true
-        this.scheduleOnce(()=>{
-            loading.active=false
-        },0.5)
+        let loading=this.node.getChildByName("loading")
+        if (loading) {
+            loading.active=true
+            this.scheduleOnce(()=>{
+                loading.active=false
+            },0.5)
+        }
     }
 
     /** 更新开始按钮的状态显示 */
@@ -670,7 +678,7 @@ export class MissionComp extends CCComp {
         this.changePhase(MissionPhase.None);
         this.cleanComponents()
         this.clearBattlePools()
-        this.node.active=false
+        oops.gui.remove(UIID.Mission);
     }
 
     /**