feat(frontend): split test assistant nav into cases and batch pages

Make 测试助手 a sidebar section like 监控观察, with placeholder routes for 测试用例 and 批量测试.

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend/src/app/test/batch/page.tsx

@@ -0,0 +1,5 @@
+import { BatchTestPage } from "@/components/pages/BatchTestPage";
+
+export default function Page() {
+  return <BatchTestPage />;
+}

frontend/src/app/test/cases/page.tsx

@@ -0,0 +1,5 @@
+import { TestCasesPage } from "@/components/pages/TestCasesPage";
+
+export default function Page() {
+  return <TestCasesPage />;
+}

frontend/src/app/test/page.tsx

@@ -1,5 +1,5 @@
-import { TestPage } from "@/components/pages/TestPage";
+import { redirect } from "next/navigation";
 
 export default function Page() {
-  return <TestPage />;
+  redirect("/test/cases");
 }

frontend/src/components/layout/Sidebar.tsx

@@ -9,9 +9,11 @@ import {
   Brain,
   ChevronLeft,
   ChevronUp,
+  ClipboardList,
   Clock3,
   Database,
   HelpCircle,
+  Layers,
   Wrench,
   Home,
   LogOut,
@@ -51,6 +53,11 @@ const monitorSubItems: NavItem[] = [
   { href: "/dashboard", label: "数据看板", icon: Database },
 ];
 
+const testSubItems: NavItem[] = [
+  { href: "/test/cases", label: "测试用例", icon: ClipboardList },
+  { href: "/test/batch", label: "批量测试", icon: Layers },
+];
+
 export function Sidebar({ collapsed, onToggle }: SidebarProps) {
   const pathname = usePathname();
   const router = useRouter();
@@ -62,6 +69,7 @@ export function Sidebar({ collapsed, onToggle }: SidebarProps) {
 
   const componentActive = componentSubItems.some((item) => isActive(item.href));
   const monitorActive = monitorSubItems.some((item) => isActive(item.href));
+  const testActive = testSubItems.some((item) => isActive(item.href));
 
   async function handleLogout() {
     await logout();
@@ -201,13 +209,43 @@ export function Sidebar({ collapsed, onToggle }: SidebarProps) {
           </div>
 
           <div className="pt-2">
+            {collapsed ? (
+              <div
+                className="flex h-8 items-center justify-center"
+                aria-hidden="true"
+                title="测试助手"
+              >
+                <span className="h-px w-6 rounded-full bg-hairline-strong" />
+              </div>
+            ) : (
+              <div
+                className={[
+                  "flex h-11 w-full items-center gap-3 rounded-full px-3 text-sm",
+                  testActive ? "text-foreground" : "text-muted-foreground",
+                ].join(" ")}
+              >
+                <PlayCircle size={18} />
+                <span className="font-medium">测试助手</span>
+              </div>
+            )}
+
+            <div
+              className={[
+                "mt-1 space-y-1 transition-[padding] duration-300 ease-[cubic-bezier(0.22,1,0.36,1)]",
+                collapsed ? "pl-0" : "pl-5",
+              ].join(" ")}
+            >
+              {testSubItems.map((item) => (
                 <NavButton
-              active={isActive("/test")}
+                  key={item.href}
+                  active={isActive(item.href)}
                   collapsed={collapsed}
-              icon={PlayCircle}
-              label="测试助手"
-              href="/test"
+                  icon={item.icon}
+                  label={item.label}
+                  href={item.href}
                 />
+              ))}
+            </div>
           </div>
 
         </div>

frontend/src/components/pages/BatchTestPage.tsx

@@ -0,0 +1,10 @@
+import { PlaceholderPage } from "./PlaceholderPage";
+
+export function BatchTestPage() {
+  return (
+    <PlaceholderPage
+      title="批量测试"
+      description="按用例集批量跑测助手，汇总通过率与失败详情。"
+    />
+  );
+}

frontend/src/components/pages/TestCasesPage.tsx

@@ -0,0 +1,10 @@
+import { PlaceholderPage } from "./PlaceholderPage";
+
+export function TestCasesPage() {
+  return (
+    <PlaceholderPage
+      title="测试用例"
+      description="管理助手的测试用例，覆盖典型问答与边界场景。"
+    />
+  );
+}

frontend/src/components/pages/TestPage.tsx

@@ -1,10 +0,0 @@
-import { PlaceholderPage } from "./PlaceholderPage";
-
-export function TestPage() {
-  return (
-    <PlaceholderPage
-      title="测试助手"
-      description="在发布前通过实时视频对话测试助手的表现与交互体验。"
-    />
-  );
-}