🔒 Fix memory leak in event listener removal

Stores bound function references during initialization to properly remove event listeners when destroy() is called, preventing memory leaks caused by unbound listeners accumulating.

Co-authored-by: jsem-nerad <88319121+jsem-nerad@users.noreply.github.com>

Author: google-labs-jules[bot]

src/dotwave.js

@@ -241,13 +241,18 @@
      * Add event listeners for mouse movement and window resize
      */
     DotWave.prototype._addEventListeners = function() {
+        this._boundMouseMove = this._handleMouseMove.bind(this);
+        this._boundMouseEnter = this._handleMouseEnter.bind(this);
+        this._boundMouseLeave = this._handleMouseLeave.bind(this);
+        this._boundResize = this._handleResize.bind(this);
+
         // Mouse movement listeners
-        this.container.addEventListener('mousemove', this._handleMouseMove.bind(this));
-        this.container.addEventListener('mouseenter', this._handleMouseEnter.bind(this));
-        this.container.addEventListener('mouseleave', this._handleMouseLeave.bind(this));
+        this.container.addEventListener('mousemove', this._boundMouseMove);
+        this.container.addEventListener('mouseenter', this._boundMouseEnter);
+        this.container.addEventListener('mouseleave', this._boundMouseLeave);
 
         // Window resize
-        window.addEventListener('resize', this._handleResize.bind(this));
+        window.addEventListener('resize', this._boundResize);
     };
 
     /**
@@ -574,10 +579,17 @@
         }
 
         // Remove event listeners
-        this.container.removeEventListener('mousemove', this._handleMouseMove);
-        this.container.removeEventListener('mouseenter', this._handleMouseEnter);
-        this.container.removeEventListener('mouseleave', this._handleMouseLeave);
-        window.removeEventListener('resize', this._handleResize);
+        if (this._boundMouseMove) {
+            this.container.removeEventListener('mousemove', this._boundMouseMove);
+            this.container.removeEventListener('mouseenter', this._boundMouseEnter);
+            this.container.removeEventListener('mouseleave', this._boundMouseLeave);
+            window.removeEventListener('resize', this._boundResize);
+
+            this._boundMouseMove = null;
+            this._boundMouseEnter = null;
+            this._boundMouseLeave = null;
+            this._boundResize = null;
+        }
 
         // Remove canvas
         if (this.canvas && this.canvas.parentNode) {