feat(boss): tint boss sprite outline by phase (P2 green, P3 red)

Add FlashSprite.setOutlineByBossPhase with light/dark green shade option and red fallback; BossPhaseSystem drives HeroViewComp.applyBossPhaseOutline directly after phase switch (MON faction, no hero-level event semantics, pool-node safe); extract getFlashSprite/applyOutlineByLevel to dedupe the three outline call sites.

assets/script/game/hero/BossPhaseSystem.ts

@@ -19,6 +19,7 @@ import { SkillSet } from "../common/config/SkillSet";
 import { mLogger } from "../common/Logger";
 import { HeroAttrsComp } from "./HeroAttrsComp";
 import { BossPhaseComp } from "./BossPhaseComp";
+import { HeroViewComp } from "./HeroViewComp";
 
 /** 阶段模块调试日志开关 */
 const DEBUG = true;
@@ -119,6 +120,13 @@ export class BossPhaseSystem extends ecs.ComblockSystem implements ecs.ISystemUp
             fromPhase: from,
             toPhase: phase.index,
         });
+
+        // 直接驱动描边：Boss 是 MON 阵营，不走英雄 HeroLvUp 语义；
+        // 且对象池节点上挂全局事件监听易漏注销，直接调视图组件最稳
+        const view = e.get(HeroViewComp);
+        if (view && view.node && view.node.isValid) {
+            view.applyBossPhaseOutline(phase.index);
+        }
     }
 
     /** TODO: 阶段退场表现（震屏/变暗等），后续迭代实现 */