fix: 修正阶段切换动画触发条件与目标节点

调整任务阶段切换时的动画表现，仅在进入战斗阶段时触发缩放动画。
将动画目标节点从 phaseNode 改为 time_node，并调整缩放比例以优化视觉反馈。

assets/script/game/map/MissionComp.ts

@@ -382,15 +382,12 @@ export class MissionComp extends CCComp {
                     label.string = `第 ${wave}/20 波`;
                 }
                 
-                // 阶段切换动感表现：针对阶段变化加入缩放与回弹动画，让流程充满心流体验
-                if (targetPhase === MissionPhase.PrepareStart || 
-                    targetPhase === MissionPhase.PrepareEnd ||
-                    targetPhase === MissionPhase.BattleStart || 
-                    targetPhase === MissionPhase.BattleEnd) {
-                    Tween.stopAllByTarget(phaseNode);
-                    phaseNode.scale = v3(0.5, 0.5, 1);
-                    tween(phaseNode)
-                        .to(0.3, { scale: v3(1.5, 1.5, 1) }, { easing: "backOut" })
+                // 阶段切换动感表现：只在进入战斗阶段跳动一下，让流程充满心流体验
+                if (targetPhase === MissionPhase.BattleStart) {
+                    Tween.stopAllByTarget(this.time_node);
+                    this.time_node.scale = v3(1, 1, 1);
+                    tween(this.time_node)
+                        .to(0.3, { scale: v3(1.2, 1.2, 1) }, { easing: "backOut" })
                         .to(0.2, { scale: v3(1, 1, 1) }, { easing: "sineInOut" })
                         .start();
                 }