elements.chatInput.prop('disabled', state.isProcessing);
    }

    /**
     * Scroll chat to bottom
     */
    function scrollToBottom() {
        elements.chatMessages.scrollTop(elements.chatMessages[0].scrollHeight);
    }

    /**
     * Render Markdown text to sanitized HTML.
     * Policy is aligned with server-side MarkdownRenderer (OWASP sanitizer).
     */