feat: add fixed questions and improve authentication

frontend-web/src/core/threads/hooks.ts

@@ -696,17 +696,15 @@ export function useThreadStream({
         }
         return;
       }
-      // A "thread not found" 404 almost always means the URL points at a
-      // thread from a previous login session — either this tab outlived a
-      // logout/re-login or the thread genuinely belongs to a different user.
-      // Re-frame the error around the *current* logged-in identity and bounce
-      // the user to a fresh chat instead of leaving them stuck on the stale
-      // route looking at a raw HTTP 404.
-      if (isThreadNotAccessibleError(message)) {
-        const userLabel = buildCurrentUserLabel();
-        toast.info(
-          `当前登录用户为 ${userLabel}，原对话不存在或无权访问，正在为你刷新页面…`,
-        );
+      // A "thread not found" 404 means this route cannot accept another turn.
+      // Move to a fresh chat without a full browser reload; the old reload path
+      // made every click look like a crash and could loop indefinitely when a
+      // different tab's cookie kept overriding this tab's Bearer token.
+      if (isThreadNotAccessibleError(message)) {
+        const userLabel = buildCurrentUserLabel();
+        toast.info(
+          `当前登录用户为 ${userLabel}，原对话不存在或无权访问，已为你打开新对话。`,
+        );
         // Prefer staying inside an agent chat context when the user is on an
         // agent thread URL — otherwise fall back to the global new chat.
         const hash = typeof window !== "undefined" ? window.location.hash : "";
@@ -717,18 +715,7 @@ export function useThreadStream({
           : iframeMatch
             ? "/page/workspace/chats_iframe/new"
             : "/page/workspace/chats/new";
-        // First navigate to a safe URL so the post-reload page lands on a
-        // valid route. Then full-reload so TanStack Query cache, context
-        // providers and any other state captured under the previous user's
-        // identity get rebuilt against the current login.
-        if (typeof window !== "undefined") {
-          window.location.hash = target;
-          window.setTimeout(() => {
-            window.location.reload();
-          }, 900);
-        } else {
-          navigate(target, { replace: true });
-        }
+        navigate(target, { replace: true });
         return;
       }
       // 上一轮还没结束又发了新问题（409）或并发达到上限（429）：