fix(workspace): 恢复先删后建并修复新会话初始化时序

- 新会话初始化改为 delete -> create

- 通过初始化就绪门控，确保 history 在创建完成后再加载

- 发送消息前等待初始化完成，避免与初始化并发

frontend/src/app/workspace/chats/[thread_id]/page.tsx

@@ -81,16 +81,23 @@ export default function ChatPage() {
     () => isNewThread && !safeThreadId,
     [isNewThread, safeThreadId],
   );
+  const [isThreadInitReady, setIsThreadInitReady] = useState(false);
 
   const streamThreadId = useMemo(() => {
-    if (isNewThread && createNewSession) {
+    if (!safeThreadId) {
+      return undefined;
+    }
+    // In /new flow, defer history loading until thread init is finished:
+    // delete -> create -> history.
+    if (isNewThread && !isThreadInitReady) {
       return undefined;
     }
     return safeThreadId;
-  }, [createNewSession, isNewThread, safeThreadId]);
+  }, [isNewThread, isThreadInitReady, safeThreadId]);
   const apiClient = useMemo(() => getAPIClient(isMock), [isMock]);
   const warnedMissingThreadIdRef = useRef(false);
   const initializedThreadRef = useRef<string | null>(null);
+  const threadInitPromiseRef = useRef<Promise<void> | null>(null);
 
   const { showNotification } = useNotification();
   const currentSlogan = motivationSlogans[
@@ -130,6 +137,7 @@ export default function ChatPage() {
   useEffect(() => {
     if (!isNewThread) {
       warnedMissingThreadIdRef.current = false;
+      setIsThreadInitReady(true);
       return;
     }
     if (!safeThreadId) {
@@ -137,29 +145,38 @@ export default function ChatPage() {
         warnedMissingThreadIdRef.current = true;
         toast.error(t.chatPage.missingThreadIdForCreate);
       }
+      setIsThreadInitReady(false);
       return;
     }
     warnedMissingThreadIdRef.current = false;
     if (initializedThreadRef.current === safeThreadId) return;
     initializedThreadRef.current = safeThreadId;
-    void apiClient.threads
+    setIsThreadInitReady(false);
-      // TODO: 先注释先删除再创建的逻辑
+
-      // .delete(safeThreadId)
+    const initPromise = apiClient.threads
-      // .catch(() => undefined)
+      .delete(safeThreadId)
-      // .then(() =>
+      .catch(() => undefined)
-      //   apiClient.threads.create({
+      .then(() =>
-      //     threadId: safeThreadId,
+        apiClient.threads.create({
-      //     ifExists: "raise",
+          threadId: safeThreadId,
-      //   }),
+          ifExists: "do_nothing",
-      // )
+        }),
-      .create({
+      )
-        threadId: safeThreadId,
+      .then(() => {
-        ifExists: "do_nothing",
+        setIsThreadInitReady(true);
       })
       .catch(() => {
         initializedThreadRef.current = null;
+        setIsThreadInitReady(false);
         toast.error(t.chatPage.createSessionFailed);
       });
+
+    threadInitPromiseRef.current = initPromise;
+    void initPromise.finally(() => {
+      if (threadInitPromiseRef.current === initPromise) {
+        threadInitPromiseRef.current = null;
+      }
+    });
   }, [
     apiClient,
     isNewThread,
@@ -291,7 +308,7 @@ export default function ChatPage() {
   const [showExitDialog, setShowExitDialog] = useState(false);
   const isStreaming = isUploading || thread.isLoading;
   const handleSubmit = useCallback(
-    (message: Parameters<typeof sendMessage>[1]) => {
+    async (message: Parameters<typeof sendMessage>[1]) => {
       if (isSelectedSkillBootstrapping) {
         return;
       }
@@ -299,6 +316,12 @@ export default function ChatPage() {
         toast.error(t.chatPage.missingThreadIdForSend);
         return;
       }
+      if (isNewThread && safeThreadId) {
+        await threadInitPromiseRef.current;
+      }
+      if (isNewThread && safeThreadId && !isThreadInitReady) {
+        return;
+      }
       setHasSubmitted(true);
       if (safeThreadId && (isNewThread || showWelcomeStyle)) {
         router.replace(`/workspace/chats/${safeThreadId}?is_chatting=true`);
@@ -307,6 +330,7 @@ export default function ChatPage() {
     },
     [
       isNewThread,
+      isThreadInitReady,
       isSelectedSkillBootstrapping,
       router,
       safeThreadId,
@@ -633,14 +657,14 @@ export default function ChatPage() {
                     type: POST_MESSAGE_TYPES.IS_CHATTING,
                     isChatting: false,
                   });
-                  resetNewSessionState();
                   // 始终复用 query 中的 thread_id。
                   const nextQuery = new URLSearchParams();
                   if (threadId && threadId !== "new") {
                     nextQuery.set("thread_id", threadId);
                   }
+                  // /workspace/chats/${threadId}?is_chatting=false
                   router.replace(
-                    `/workspace/chats/${threadId}?is_chatting=false`,
+                    `/workspace/chats/new?thread_id=${threadId}`,
                   );
                 }}
               >

frontend/src/components/workspace/input-box.tsx

@@ -970,6 +970,14 @@ export function InputBox({
                 />
               </div>
             )}
+            {!showWelcomeStyle && (
+              <div className="shrink-0 h-full">
+                <ExitChattingButton
+                  router={router}
+                  threadId={threadIdFromProps}
+                />
+              </div>
+            )}
             <div ref={attachmentsButtonTourRef} className="shrink-0 h-full">
               <AddAttachmentsButton />
             </div>
@@ -1292,6 +1300,53 @@ function HistoryButton({
     </Tooltip>
   );
 }
+
+function ExitChattingButton({
+  className,
+  router,
+  threadId,
+}: {
+  className?: string;
+  router: AppRouterInstance;
+  threadId: string;
+}) {
+  const { t } = useI18n();
+  return (
+    <Tooltip content={t.inputBox.welcome}>
+      <WorkspaceToolButton
+        className={cn(
+          "text-ws-base-1 hover:text-ws-interactive-primary",
+          className,
+        )}
+        onClick={() =>
+          router.replace(`/workspace/chats/${threadId}?is_chatting=false`)
+        }
+      >
+        <svg
+          className="transition-[color] duration-200"
+          width="18"
+          height="18"
+          viewBox="0 0 18 18"
+          fill="none"
+          xmlns="http://www.w3.org/2000/svg"
+        >
+          <circle
+            className="stroke-current transition-[stroke] duration-200"
+            cx="9"
+            cy="9"
+            r="8.5"
+          />
+          <path
+            className="stroke-current transition-[stroke] duration-200"
+            d="M6 9H12"
+            strokeLinecap="round"
+            strokeLinejoin="round"
+          />
+        </svg>
+      </WorkspaceToolButton>
+    </Tooltip>
+  );
+}
 // 启动iframeSkillDialog
 function IframeSkillDialogButton({
   className,

frontend/src/components/workspace/messages/message-list-item.tsx

@@ -39,7 +39,6 @@ import {
 } from "@/core/messages/utils";
 import { useRehypeSplitWordsIntoSpans } from "@/core/rehype";
 import { materializeSkillYaml } from "@/core/skills";
-import { humanMessagePlugins } from "@/core/streamdown";
 import { dispatchMentionReference } from "@/core/threads/reference-events";
 import { cn } from "@/lib/utils";
 
@@ -225,13 +224,9 @@ function MessageContent_({
   if (isHuman) {
     const shouldRenderSummaryCollapse = isSummaryMessage && summaryBody;
     const messageResponse = contentToDisplay ? (
-      <AIElementMessageResponse
+      <div className="whitespace-break-spaces break-words">
-        remarkPlugins={humanMessagePlugins.remarkPlugins}
-        rehypePlugins={humanMessagePlugins.rehypePlugins}
-        components={components}
-      >
         {contentToDisplay}
-      </AIElementMessageResponse>
+      </div>
     ) : null;
     return (
       <div className={cn("ml-auto flex flex-col gap-2", className)}>
@@ -250,13 +245,9 @@ function MessageContent_({
                 : t.toolCalls.expandContent}
             </summary>
             <AIElementMessageContent className="w-fit border-t">
-              <AIElementMessageResponse
+              <div className="whitespace-break-spaces break-words">
-                remarkPlugins={humanMessagePlugins.remarkPlugins}
-                rehypePlugins={humanMessagePlugins.rehypePlugins}
-                components={components}
-              >
                 {summaryBody}
-              </AIElementMessageResponse>
+              </div>
             </AIElementMessageContent>
           </details>
         )}

frontend/src/core/artifacts/references.ts

@@ -32,7 +32,6 @@ export function useReferenceFiles(threadId: string | undefined) {
     queryKey: ["references", "list", threadId],
     queryFn: () => listReferenceFiles(threadId ?? ""),
     enabled: Boolean(threadId),
-    refetchInterval: 5000,
+    refetchOnWindowFocus: false,
-    refetchOnWindowFocus: true,
   });
 }

frontend/src/core/i18n/locales/en-US.ts

@@ -86,6 +86,7 @@ export const enUS: Translations = {
       "Please note, this feature will consume tokens. Ensure your account balance is greater than 200 credits.",
     addAttachments: "Add attachments",
     history: "History",
+    welcome:"Welcome",
     selectSkill: "Select Skill",
     mode: "Mode",
     flashMode: "Flash",

frontend/src/core/i18n/locales/types.ts

@@ -75,6 +75,7 @@ export interface Translations {
     createSkillPrompt: string;
     addAttachments: string;
     history: string;
+    welcome:string;
     selectSkill: string;
     mode: string;
     flashMode: string;

frontend/src/core/i18n/locales/zh-CN.ts

@@ -87,6 +87,7 @@ export const zhCN: Translations = {
       "请注意，此功能将消耗token，请保证账户余额大于200可学豆。",
     addAttachments: "添加附件",
     history: "历史记录",
+    welcome:"欢迎页",
     selectSkill: "选择Skill",
     mode: "模式",
     flashMode: "闪速",
@@ -262,7 +263,7 @@ export const zhCN: Translations = {
     noArtifactSelectedDescription: "请选择一个生成文件以查看详情",
     exitDialogTitle: "提示",
     exitDialogDescription:
-      "历史记录每七天自动删除，现在将返回欢迎页，是否继续？",
+      "每七天自动删除。现在将返回欢迎页且清空聊天消息，是否继续？",
     exitDialogConfirm: "确定",
     selectedSkillLoadFailed: "技能加载失败",
     unknownErrorRetry: "发生了未知错误，请稍后重试。",

frontend/src/core/messages/utils.ts

@@ -414,12 +414,9 @@ export function stripPriorityHintSuffix(content: string): string {
  * - Split Chinese-numbered items (e.g. "1）...") into separate paragraphs.
  */
 export function normalizeHumanMessageDisplayText(content: string): string {
-  return content
+  // Preserve human input as-is for display; only decode escaped newlines
-    .replace(/\\n/g, "\n")
+  // and normalize CRLF/CR to LF so line breaks render consistently.
-    .replace(/\r\n?/g, "\n")
+  return content.replace(/\\n/g, "\n").replace(/\r\n?/g, "\n");
-    .replace(/\n(?=\d+[）)]\s*)/g, "\n\n")
-    .replace(/\n{3,}/g, "\n\n")
-    .trim();
 }
 
 export function parseUploadedFiles(content: string): FileInMessage[] {