* Get CSRF token (fetch if not available) * @returns {Promise<string>} CSRF token

* Recursively sanitize an object or array * @param {any} obj - The object/array/value to sanitize * @returns {any} - Sanitized object/array/value

* Enhanced fetch with automatic CSRF token inclusion * @param {string} url - Request URL * @param {Object} options - Fetch options * @returns

* Create headers object with CSRF token * @param {Object} additionalHeaders - Additional headers to include * @returns {Promise<Object>} Headers

* Clear stored token (e.g., on logout or token expiry)

* Fetch CSRF token from server * @returns {Promise<string>} CSRF token