Fix: Click the reset button on the agent page shared externally, and the greeting in conversation mode should not be deleted. #10567 (#10571)

### What problem does this PR solve?

Fix: Click the reset button on the agent page shared externally, and the
greeting in conversation mode should not be deleted. #10567
### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

web/src/pages/agent/chat/use-send-agent-message.ts

@@ -200,12 +200,14 @@ export const useSendAgentMessage = ({
   beginParams,
   isShared,
   refetch,
+  isTaskMode: isTask,
 }: {
   url?: string;
   addEventList?: (data: IEventList, messageId: string) => void;
   beginParams?: any[];
   isShared?: boolean;
   refetch?: () => void;
+  isTaskMode?: boolean;
 }) => {
   const { id: agentId } = useParams();
   const { handleInputChange, value, setValue } = useHandleMessageInputChange();
@@ -217,7 +219,7 @@ export const useSendAgentMessage = ({
     return answerList[0]?.message_id;
   }, [answerList]);
 
-  const isTaskMode = useIsTaskMode();
+  const isTaskMode = useIsTaskMode(isTask);
 
   const { findReferenceByMessageId } = useFindMessageReference(answerList);
   const prologue = useGetBeginNodePrologue();
@@ -230,6 +232,7 @@ export const useSendAgentMessage = ({
     addNewestOneQuestion,
     addNewestOneAnswer,
     removeAllMessages,
+    removeAllMessagesExceptFirst,
     scrollToBottom,
   } = useSelectDerivedMessages();
   const { addEventList: addEventListFun } = useContext(AgentChatLogContext);
@@ -321,8 +324,18 @@ export const useSendAgentMessage = ({
     stopOutputMessage();
     resetAnswerList();
     setSessionId(null);
-    removeAllMessages();
-  }, [resetAnswerList, removeAllMessages, stopOutputMessage]);
+    if (isTaskMode) {
+      removeAllMessages();
+    } else {
+      removeAllMessagesExceptFirst();
+    }
+  }, [
+    stopOutputMessage,
+    resetAnswerList,
+    isTaskMode,
+    removeAllMessages,
+    removeAllMessagesExceptFirst,
+  ]);
 
   const handlePressEnter = useCallback(() => {
     if (trim(value) === '') return;

web/src/pages/agent/hooks/use-get-begin-query.tsx

@@ -27,13 +27,16 @@ export function useSelectBeginNodeDataInputs() {
   );
 }
 
-export function useIsTaskMode() {
+export function useIsTaskMode(isTask?: boolean) {
   const getNode = useGraphStore((state) => state.getNode);
 
   return useMemo(() => {
+    if (typeof isTask === 'boolean') {
+      return isTask;
+    }
     const node = getNode(BeginId);
     return node?.data?.form?.mode === AgentDialogueMode.Task;
-  }, [getNode]);
+  }, [getNode, isTask]);
 }
 
 export const useGetBeginNodeDataQuery = () => {

web/src/pages/agent/hooks/use-send-shared-message.ts

@@ -59,6 +59,7 @@ export const useSendNextSharedMessage = (
     addEventList,
     beginParams: params,
     isShared: true,
+    isTaskMode,
   });
 
   const ok = useCallback(