fix(英雄视图): 修复血条进度计算并优化显示逻辑

- 添加对 hp_max 为 0 的防护，避免除零错误
- 使用 clamp 确保进度值在 0 到 1 之间
- 仅在血条减少时激活顶栏和播放抖动动画
- 血条增加时自动降低顶栏透明度

assets/script/game/hero/HeroViewComp.ts

@@ -188,14 +188,19 @@ export class HeroViewComp extends CCComp {
         let hp_max=this.model.hp_max;
         // mLogger.log(this.debugMode, 'HeroViewComp', "hp_show",hp,hp_max)
         
-        let targetProgress = hp / hp_max;
+        let targetProgress = hp_max > 0 ? hp / hp_max : 0;
+        targetProgress = clamp(targetProgress, 0, 1);
         let hpNode = this.top_node.getChildByName("hp");
         let hpProgressBar = hpNode.getComponent(ProgressBar);
 
+        const prevProgress = hpProgressBar.progress;
         if (targetProgress < hpProgressBar.progress) {
             this.activateTopBar();
             this.playHpBarShake();
-            hpProgressBar.progress = targetProgress;
+        }
+        hpProgressBar.progress = targetProgress;
+        if (targetProgress > prevProgress) {
+            this.setTopBarOpacity(false);
         }
     }