hideEmptyState();
        hideErrorBanner();
        updateUI();
        showStatus('thinking');
        showProgressIndicator();

        // Add user message
        addMessage('user', message);

        // Clear input
        elements.chatInput.val('');
        updateCharCount();
        autoResizeTextarea();

        // Add thinking indicator

        // Add user message immediately for session integrity under concurrent access
        final ChatMessage userChatMessage = ChatMessage.userMessage(userMessage);
        session.addMessage(userChatMessage);

        try {
            // Intent detection
            final IntentDetectionResult intentResult = llmClientManager.detectIntent(userMessage, history);
            if (logger.isDebugEnabled()) {

                startIndex = i;
            } else {
                break;
            }
        }

        for (int i = startIndex; i < history.size(); i++) {
            request.addMessage(history.get(i));
        }
    }

    /**
     * Builds the evaluation prompt for relevance checking.
     *
     * @param userMessage the user's message
     * @param query the search query

        final Map<String, Object> doc = new HashMap<>();
        doc.put("title", "Doc Title");
        doc.put("url", "http://example.com");
        assistantMsg.addSource(new ChatSource(1, doc));
        session.addMessage(assistantMsg);

        final List<LlmMessage> history = chatClient.testExtractHistory(session);
        assertEquals(2, history.size());
        assertEquals("user", history.get(0).getRole());