Add previewFilterGroupProducts AJAX handler

- Add case in handleEntitySelectorAjax switch for previewFilterGroupProducts
- Implement ajaxPreviewFilterGroupProducts() to get products by attribute/feature group
- Returns items with name, reference, manufacturer, image for popover preview

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/EntitySelector.php

@@ -263,6 +263,9 @@ trait EntitySelector
             case 'getCategoryTree':
                 $this->ajaxGetCategoryTree();
                 return true;
+            case 'previewFilterGroupProducts':
+                $this->ajaxPreviewFilterGroupProducts();
+                return true;
         }
 
         return false;
@@ -583,6 +586,109 @@ trait EntitySelector
         }
     }
 
+    /**
+     * AJAX: Preview products that have any value from a specific attribute or feature group
+     * Used by filter panel toggle buttons
+     */
+    protected function ajaxPreviewFilterGroupProducts()
+    {
+        $groupId = (int) Tools::getValue('group_id');
+        $groupType = Tools::getValue('group_type'); // 'attribute' or 'feature'
+        $limit = (int) Tools::getValue('limit', 10);
+
+        if (!$groupId || !in_array($groupType, ['attribute', 'feature'])) {
+            die(json_encode([
+                'success' => false,
+                'error' => 'Invalid parameters'
+            ]));
+        }
+
+        $idLang = (int) Context::getContext()->language->id;
+        $idShop = (int) Context::getContext()->shop->id;
+
+        try {
+            $db = Db::getInstance();
+
+            if ($groupType === 'attribute') {
+                // Get products with any attribute from this group
+                $sql = new DbQuery();
+                $sql->select('DISTINCT p.id_product');
+                $sql->from('product', 'p');
+                $sql->innerJoin('product_shop', 'ps', 'ps.id_product = p.id_product AND ps.id_shop = ' . $idShop);
+                $sql->innerJoin('product_attribute', 'pa', 'pa.id_product = p.id_product');
+                $sql->innerJoin('product_attribute_combination', 'pac', 'pac.id_product_attribute = pa.id_product_attribute');
+                $sql->innerJoin('attribute', 'a', 'a.id_attribute = pac.id_attribute AND a.id_attribute_group = ' . $groupId);
+                $sql->where('ps.active = 1');
+            } else {
+                // Get products with any feature value from this group
+                $sql = new DbQuery();
+                $sql->select('DISTINCT p.id_product');
+                $sql->from('product', 'p');
+                $sql->innerJoin('product_shop', 'ps', 'ps.id_product = p.id_product AND ps.id_shop = ' . $idShop);
+                $sql->innerJoin('feature_product', 'fp', 'fp.id_product = p.id_product');
+                $sql->innerJoin('feature_value', 'fv', 'fv.id_feature_value = fp.id_feature_value AND fv.id_feature = ' . $groupId);
+                $sql->where('ps.active = 1');
+            }
+
+            // Get total count first
+            $countSql = clone $sql;
+            $countResult = $db->executeS($countSql);
+            $totalCount = count($countResult);
+
+            // Get limited results for preview
+            $sql->limit($limit);
+            $results = $db->executeS($sql);
+            $productIds = array_column($results, 'id_product');
+
+            // Get product details for preview
+            $items = [];
+            if (!empty($productIds)) {
+                $productSql = new DbQuery();
+                $productSql->select('p.id_product, pl.name, p.reference, i.id_image, m.name as manufacturer');
+                $productSql->from('product', 'p');
+                $productSql->innerJoin('product_lang', 'pl', 'pl.id_product = p.id_product AND pl.id_lang = ' . $idLang . ' AND pl.id_shop = ' . $idShop);
+                $productSql->leftJoin('image', 'i', 'i.id_product = p.id_product AND i.cover = 1');
+                $productSql->leftJoin('manufacturer', 'm', 'm.id_manufacturer = p.id_manufacturer');
+                $productSql->where('p.id_product IN (' . implode(',', array_map('intval', $productIds)) . ')');
+                $productSql->limit($limit);
+
+                $products = $db->executeS($productSql);
+
+                foreach ($products as $product) {
+                    $imageUrl = null;
+                    if ($product['id_image']) {
+                        $imageUrl = Context::getContext()->link->getImageLink(
+                            Tools::link_rewrite($product['name']),
+                            $product['id_product'] . '-' . $product['id_image'],
+                            'small_default'
+                        );
+                    }
+
+                    $items[] = [
+                        'id' => (int) $product['id_product'],
+                        'name' => $product['name'],
+                        'reference' => $product['reference'],
+                        'manufacturer' => $product['manufacturer'],
+                        'image' => $imageUrl
+                    ];
+                }
+            }
+
+            die(json_encode([
+                'success' => true,
+                'items' => $items,
+                'count' => $totalCount,
+                'hasMore' => $totalCount > count($items)
+            ]));
+
+        } catch (\Exception $e) {
+            die(json_encode([
+                'success' => false,
+                'error' => $e->getMessage()
+            ]));
+        }
+    }
+
     /**
      * Apply modifiers (sort, limit) to product IDs
      * Delegates to ProductConditionResolver