fix(studio): 笔记切换页面不刷新 + 侧边栏错误提示友好化

- WorkspaceRoutes 给 StudioNotebookDetailPage 加 key={notebookId}，切换笔记时强制重新挂载
- createSearchSpace 接口失败时解析响应体 detail 字段，直接展示服务端错误信息

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend-web/src/components/workspace/workspace-nav-studio.tsx

@@ -34,8 +34,6 @@ const NAV_ITEM_CLASS =
   "data-[active=true]:bg-primary/15 data-[active=true]:text-primary data-[active=true]:shadow-none " +
   "dark:hover:bg-primary/15 dark:data-[active=true]:bg-primary/25 dark:data-[active=true]:text-primary-foreground";
 
-const SIDEBAR_PREVIEW_COUNT = 5;
-
 export function WorkspaceNavStudio() {
   const { notebooks, isLoading, isError } = useStudioNotebooks();
   const { pathname } = useLocation();
@@ -71,6 +69,7 @@ export function WorkspaceNavStudio() {
     return null;
   }
 
+  const SIDEBAR_PREVIEW_COUNT = 2;
   const preview = notebooks.slice(0, SIDEBAR_PREVIEW_COUNT);
 
   return (

frontend-web/src/core/studio/api.ts

@@ -46,7 +46,10 @@ export async function createSearchSpace(
     },
     body: JSON.stringify({ name, description: "", citations_enabled: true }),
   });
-  if (!res.ok) throw new Error(`创建失败：${res.status}`);
+  if (!res.ok) {
+    const body = await res.json().catch(() => null);
+    throw new Error(body?.detail || `创建失败：${res.status}`);
+  }
 }
 
 export async function uploadSourceText(

frontend-web/src/pages/WorkspaceRoutes.tsx

@@ -1,5 +1,5 @@
 import type { CSSProperties, ReactNode } from "react";
-import { Navigate, Route, Routes } from "react-router-dom";
+import { Navigate, Route, Routes, useParams } from "react-router-dom";
 
 import { getStoredAuth } from "@/core/auth";
 
@@ -39,6 +39,11 @@ import AIWritingPage from "@/open-canvas/pages/AIWritingPage";
 import StudioNotebooksPage from "./StudioNotebooksPage";
 import StudioNotebookDetailPage from "./StudioNotebookDetailPage";
 import RoundtablePlanningPage from "@/roundtable-planning/pages/RoundtablePlanningPage";
+
+function NotebookDetailPageWithKey() {
+  const { notebookId } = useParams<{ notebookId: string }>();
+  return <StudioNotebookDetailPage key={notebookId} />;
+}
 import "@/roundtable-planning/styles/roundtable-planning.css";
 
 export function WorkspaceLayout({
@@ -219,7 +224,7 @@ export default function WorkspaceRoutes({
         element={
           <WorkspaceLayout {...layoutProps}>
             <ChatRuntime>
-              <StudioNotebookDetailPage />
+              <NotebookDetailPageWithKey />
             </ChatRuntime>
           </WorkspaceLayout>
         }