🔧 Fix: Add StatusEffectSystem.js to index.html

Fixed ReferenceError where StatusEffectSystem was not defined.
The system class exists but wasn't included in the HTML.

index.html

@@ -143,6 +143,7 @@
     <script src="src/systems/AchievementTriggers.js"></script>
     <script src="src/systems/StarterChestSystem.js"></script>
     <script src="src/systems/GemDropSystem.js"></script>
+    <script src="src/systems/StatusEffectSystem.js"></script> <!-- 🌈 Status Effects -->
 
     <!-- Multiplayer -->
     <!-- <script src="https://cdn.socket.io/4.7.2/socket.io.min.js"></script> -->