Feature: Implement invincibility and combo systems

- Added Invincibility component to manage invincibility state and duration.
- Introduced InvincibilitySystem to handle visual effects during invincibility.
- Updated Game class to integrate combo multiplier mechanics and high score tracking.
- Enhanced UI to display current combo status and high score.
- Configured GameConfig for centralized game settings, including obstacle damage and invincibility duration.
- Updated game logic to reset combo on damage and manage health regeneration.

This update enhances gameplay dynamics by introducing invincibility frames and a scoring combo system.

src/game/EntityFactory.js

@@ -3,7 +3,9 @@ import { Velocity } from '../components/Velocity.js';
 import { MeshComponent } from '../components/MeshComponent.js';
 import { Collidable } from '../components/Collidable.js';
 import { Health } from '../components/Health.js';
+import { Invincibility } from '../components/Invincibility.js';
 import { PlayerTag, CoinTag, ObstacleTag, BoundaryConstrained } from '../components/Tags.js';
+import { GameConfig } from './GameConfig.js';
 
 /**
  * EntityFactory - creates pre-configured game entities with appropriate components.
@@ -52,6 +54,8 @@ export class EntityFactory {
     this.world.addComponent(entity, new MeshComponent(mesh));
     this.world.addComponent(entity, new Collidable(0, 'player')); // Player center point (original behavior)
     this.world.addComponent(entity, new Health(100));
+    // Invincibility starts inactive until first damage
+    this.world.addComponent(entity, new Invincibility(GameConfig.INVINCIBILITY_DURATION, false));
     this.world.addComponent(entity, new PlayerTag());
     this.world.addComponent(entity, new BoundaryConstrained(this.groundSize));