chore: remove debug logging from AssistantChatPage

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/src/pages/AssistantChatPage.tsx

@@ -102,9 +102,7 @@ export default function AssistantChatPage() {
 
   // Restore session from sessionStorage on mount (when URL has no session ID)
   useEffect(() => {
-    console.log('[AssistantChat] Mount restore check — urlSessionId:', urlSessionId, 'activeChatId:', activeChatId)
     if (!urlSessionId && activeChatId) {
-      console.log('[AssistantChat] Calling selectChat to restore:', activeChatId)
       selectChat(activeChatId)
     }
   }, []) // eslint-disable-line react-hooks/exhaustive-deps
@@ -209,7 +207,6 @@ export default function AssistantChatPage() {
   }
 
   const selectChat = useCallback(async (chatId: string) => {
-    console.log('[AssistantChat] selectChat called with:', chatId)
     setActiveChatId(chatId)
     // Clear TaskLane when switching chats — will restore from backend if available
     setShowTaskLane(false)
@@ -217,7 +214,6 @@ export default function AssistantChatPage() {
     setActiveActions([])
     try {
       const detail = await aiSessionsApi.getSession(chatId)
-      console.log('[AssistantChat] getSession response — messages:', detail.conversation_messages?.length, 'pending_task_lane:', !!detail.pending_task_lane)
       setMessages(
         (detail.conversation_messages || []).map(m => ({
           role: m.role as 'user' | 'assistant',
@@ -241,8 +237,7 @@ export default function AssistantChatPage() {
           }
         }
       }
-    } catch (err) {
-      console.error('[AssistantChat] Failed to load chat session:', err)
+    } catch {
       setMessages([])
     }
   }, [])