Fixes missing cart image by adjusting script enqueue and adding MutationObserver to handle dynamically rendered book wrappers

plugin.php

@@ -26,18 +26,31 @@ add_action('template_redirect', function() {
 });
 
 
-
 function enqueue_shop_links_script() {
-    if (is_singular()) { 
-        wp_enqueue_script('search_shop_link',plugins_url('/js/search_shop_link.js', __FILE__));
-    wp_add_inline_script( 'search_shop_link', 'window.searchShopLinkImageUrl = "' . plugins_url('assets/cart_add.png', __FILE__) . '";'  );
-    
+    if (is_singular()) {
+
+        // 1. Enqueue your JS file
+        wp_enqueue_script(
+            'search_shop_link',
+            plugins_url('js/search_shop_link.js', __FILE__),
+            [],
+            false,
+            true
+        );
+
+        // 2. Localize data for that script
+        wp_localize_script(
+            'search_shop_link',
+            'SearchShopLinkData',
+            [
+                'imageUrl' => plugins_url('assets/cart_add.png', __FILE__)
+            ]
+        );
     }
 }
 add_action('wp_enqueue_scripts', 'enqueue_shop_links_script');
 
 
-
 function br_replace_book_wrapper($html) {
     if (strpos($html, 'product-details') === false) {
         return $html;