feat: #fe flash HUD on changes

frontend/src/js/fight_scene.ts

@@ -304,12 +304,14 @@ export default class FightScene extends Phaser.Scene {
   updateScore(delta: number) {
     this.score += delta;
     this.hud.setScore(this.score);
+    this.hud.changeFlash(this.hud.score, delta > 0 ? 0xffff00 : 0xff0000);
   }
 
   updateHealth(delta: number) {
     this.health += delta;
     this.health = Math.max(this.health, 0);
     this.hud.setHealth(this.health);
+    this.hud.changeFlash(this.hud.health, delta > 0 ? 0x00ff00 : 0xff0000);
     this.checkAlive();
   }
 

frontend/src/js/hud.ts

@@ -152,4 +152,9 @@ export default class HUD {
       onComplete: (_tween, [target]) => target.destroy(),
     });
   }
+
+  changeFlash(object: Phaser.GameObjects.Text, color: number) {
+    object.setTintFill(color);
+    this.scene.time.delayedCall(100, () => object.clearTint());
+  }
 }