state.isProcessing = false;
        updateUI();
        showStatus('error');
        hideProgressIndicator();
        showErrorBanner(errorMessage);
    }

    /**
     * Show error banner
     */
    function showErrorBanner(message) {
        elements.errorBanner.find('.error-message').text(message);
        elements.errorBanner.removeClass('d-none');
    }

    /**