feat: 为英雄和怪物添加下落入场动画

- 在 MissionHeroComp 和 MissionMonComp 中定义下落高度常量
- 修改英雄和怪物的加载方法，接受目标落地高度参数
- 使用 Tween 实现平滑下落动画，下落距离越大持续时间越长
- 下落期间禁用移动和碰撞器，落地后恢复
- 为怪物添加随机下落高度偏移，减轻重叠感

assets/script/game/hero/Hero.ts

@@ -1,4 +1,4 @@
-import { instantiate, Node, Prefab, Vec3 ,v3,resources,SpriteFrame,Sprite,SpriteAtlas, BoxCollider2D} from "cc";
+import { instantiate, Node, Prefab, Vec3 ,v3,resources,SpriteFrame,Sprite,SpriteAtlas, BoxCollider2D, tween, Tween} from "cc";
 import { oops } from "../../../../extensions/oops-plugin-framework/assets/core/Oops";
 import { ecs } from "../../../../extensions/oops-plugin-framework/assets/libs/ecs/ECS";
 import { smc } from "../common/SingletonModuleComp";
@@ -39,7 +39,7 @@ export class Hero extends ecs.Entity {
 
 
     /** 加载角色 */
-    load(pos: Vec3 = Vec3.ZERO,scale:number = 1,uuid:number=1001) {
+    load(pos: Vec3 = Vec3.ZERO,scale:number = 1,uuid:number=1001, dropToY:number = pos.y) {
         scale = 1
         // 查找空闲英雄槽位
         let size=1
@@ -95,7 +95,24 @@ export class Hero extends ecs.Entity {
         const move = this.get(MoveComp);
         move.direction = 1; // 向右移动
         move.targetX = resolveFormationTargetX(model.fac, model.type);
-        move.baseY = pos.y;
+        move.baseY = dropToY;
+        move.moving = false;
+        const dropDistance = Math.abs(pos.y - dropToY);
+        const dropDuration = Math.max(0.18, Math.min(0.38, dropDistance / 1200));
+        Tween.stopAllByTarget(node);
+        tween(node)
+            .to(dropDuration, { position: v3(pos.x, dropToY, 0) })
+            .call(() => {
+                if (!node || !node.isValid) return;
+                node.setPosition(pos.x, dropToY, 0);
+                move.moving = true;
+                if (collider) {
+                    collider.enabled = true;
+                    collider.group = BoxSet.HERO;
+                    collider.apply();
+                }
+            })
+            .start();
         smc.vmdata.mission_data.hero_num++
     }