fix: clear product image URL from window object on component unmount to prevent memory leaks

src/components/Images.js

@@ -23,6 +23,9 @@ class Images extends Component {
       this.updatePics();
     }
   }
+  componentWillUnmount() {
+    window.productImageUrl = null;
+  }
 
   updatePics = (newMainPic = this.state.mainPic) => {
     if (!window.tinyPicCache) window.tinyPicCache = {}; 
@@ -105,6 +108,8 @@ class Images extends Component {
   render() {
     // SPA version - full functionality with static fallback
     const getImageSrc = () => {
+      if(window.productImageUrl) return window.productImageUrl;
+
       // If dynamic image is loaded, use it
       if (this.state.pics[this.state.mainPic]) {
         return this.state.pics[this.state.mainPic];