fix: Remove duplicate RABBIT declaration and move toggleDebug function

js/main.js

@@ -68,6 +68,11 @@ function resizeCanvas() {
     canvas.height = window.innerHeight - document.querySelector('.controls').offsetHeight;
 }
 
+function toggleDebug() {
+    debugMode = !debugMode;
+    document.getElementById('debug-btn').classList.toggle('active');
+}
+
 function simulationLoop(timestamp) {
     // Calculate FPS
     const deltaTime = timestamp - lastFrameTime;