Chore: Updating ProductDocumentLocalizer to translate Custom Fields

src/Catalog/Support/ProductDocumentLocalizer.php

@@ -66,9 +66,47 @@ class ProductDocumentLocalizer
             }
         }
 
+        if (! empty($product['custom_fields'])) {
+            $product['custom_fields'] = $this->localizeCustomFields($product['custom_fields'], $locale, $fallbackLocale);
+        }
+
         return $product;
     }
 
+    /**
+     * Product::$custom_fields isn't an AttributeManifest attribute (it's a
+     * plain JSON column, see Catalog\Models\Product's own docblock), so it
+     * never goes through the {handle}_{locale} explosion above — the
+     * indexer copies it straight through (see ProductIndexer), meaning
+     * each item's `label`/`help_text` still arrives here as a raw
+     * {locale: string} object (or, for a product saved before those
+     * became translatable, a plain string). Resolved the same filled()-
+     * over-?? way as every other translated field above, to the same
+     * single current-locale string the storefront/cart already expect
+     * (see product-custom-fields.blade.php and CartController::
+     * customFieldsMeta()) — a repeater item has no other reason to reach
+     * the storefront untouched.
+     *
+     * @param  array<int, array<string, mixed>>  $fields
+     * @return array<int, array<string, mixed>>
+     */
+    private function localizeCustomFields(array $fields, string $locale, ?string $fallbackLocale): array
+    {
+        return array_map(function (array $field) use ($locale, $fallbackLocale) {
+            foreach (['label', 'help_text'] as $key) {
+                if (! is_array($field[$key] ?? null)) {
+                    continue;
+                }
+
+                $field[$key] = filled($field[$key][$locale] ?? null)
+                    ? $field[$key][$locale]
+                    : ($field[$key][$fallbackLocale] ?? null);
+            }
+
+            return $field;
+        }, $fields);
+    }
+
     /**
      * For the Meilisearch driver, Scout's paginateRaw() puts the whole raw response
      * (hits, query, processingTimeMs, ...) in items(), not a plain list of hits - the