fix: stop chat hang after misrouted themed article requests

Route themed page/article prompts to agent orchestration, reject them
from portal direct chat, and finalize regular sessions to idle when a
direct chat turn already completed.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/hooks/useTKMindChat.ts

@@ -82,6 +82,18 @@ function isDirectChatSessionId(sessionId?: string | null) {
   return typeof sessionId === 'string' && sessionId.startsWith(DIRECT_CHAT_SESSION_PREFIX);
 }
 
+function sessionFinishedViaPortalDirectChat(messages: Message[], userMessage: Message) {
+  const lastAssistant = [...messages].reverse().find((message) => message.role === 'assistant');
+  if (lastAssistant?.metadata?.source !== 'portal-direct-chat') return false;
+  const userText = getDisplayText(userMessage).trim();
+  const userId = userMessage.id;
+  return messages.some(
+    (message) =>
+      message.role === 'user' &&
+      (message.id === userId || getDisplayText(message).trim() === userText),
+  );
+}
+
 async function waitForAgentRun(runId: string): Promise<AgentRun> {
   return await waitForAgentRunWithDirectChatPreview(runId, {});
 }
@@ -1344,8 +1356,33 @@ export function useTKMindChat(
           activeRequestId.current = null;
           setChatState('idle');
         } else {
+          let finishedViaPortalDirectChat = false;
+          try {
+            const detail = await loadSessionDetail(activeSessionId);
+            if (submitToken === connectTokenRef.current) {
+              messagesRef.current = mergeConversationSnapshot(
+                messagesRef.current,
+                detail.messages,
+              );
+              messageHistoryLoadedCountRef.current = messagesRef.current.length;
+              setMessages(messagesRef.current);
+              setSession(detail.session);
+              finishedViaPortalDirectChat = sessionFinishedViaPortalDirectChat(
+                detail.messages,
+                userMessage,
+              );
+            }
+          } catch {
+            // Fall through to agent streaming when the snapshot is not ready yet.
+          }
           subscribeToSession(activeSessionId);
-          setChatState('streaming');
+          if (finishedViaPortalDirectChat) {
+            clearActiveRequestMissingTimer();
+            activeRequestId.current = null;
+            setChatState('idle');
+          } else {
+            setChatState('streaming');
+          }
         }
       } catch (err) {
         if (activeSessionId && isAmbiguousReplySubmitError(err)) {