fix(woocommerce): expose response headers from inline WC client

Adds getHeaders() / getHeader() accessors to the inline WCResponse class
and captures HTTP response headers case-insensitively via CURLOPT_HEADERFUNCTION.
Required foundation for pagination handling (Issue OpenXE-org#262).

Author: Avatarsia

www/pages/shopimporter_woocommerce.php

@@ -1245,13 +1245,26 @@ public function getCode()
   /**
    * Get headers.
    *
-   * @return array $headers WCResponse headers.
+   * @return array $headers WCResponse headers (keys normalized to lowercase).
    */
   public function getHeaders()
   {
     return $this->headers;
   }
 
+  /**
+   * Get a single response header by name (case-insensitive).
+   *
+   * @param string $name Header name (e.g. 'x-wp-totalpages').
+   *
+   * @return string|null Header value or null if not present.
+   */
+  public function getHeader($name)
+  {
+    $key = strtolower($name);
+    return isset($this->headers[$key]) ? $this->headers[$key] : null;
+  }
+
   /**
    * Get body.
    *
@@ -2137,6 +2150,7 @@ protected function getResponseHeaders()
 
       list($key, $value) = explode(': ', $line);
 
+      $key = strtolower($key);
       $headers[$key] = isset($headers[$key]) ? $headers[$key] . ', ' . trim($value) : trim($value);
     }