fix(frontend): preserve iframe theme across login

The iframe login used a fixed queryless redirect and called setTheme, which both dropped the iframe theme and persisted it into the normal site's shared theme storage.

frontend-web/src/pages/LoginPage.tsx

@@ -27,6 +27,10 @@ import {
   persistAccessToken,
   persistToolsToken,
 } from '@/core/auth/yuser-login';
+import {
+  isChatsIframeLogin,
+  resolvePostLoginRedirectPath,
+} from '@/core/page-layout/chats-iframe-route';
 import {
   isSidebarEnabledFromSearch,
   persistSidebarEnabled,
@@ -66,9 +70,7 @@ function summarizeStoredUserInfo(): Record<string, unknown> | null {
 }
 
 const DEFAULT_USERNAME = 'guest';
-const IFRAME_LOGIN_SOURCE = 'iframe';
 const DEFAULT_REDIRECT_PATH = '/page/workspace/chats/new';
-const IFRAME_REDIRECT_PATH = '/page/workspace/chats_iframe/new';
 
 type LoginStatus = 'loading' | 'success' | 'error';
 
@@ -89,19 +91,25 @@ export default function LoginPage() {
     () => readEmbedParam(searchParams.toString()) === 'on',
     [searchParams],
   );
-  const redirectPath = useMemo(
-    () =>
-      searchParams.get('from') === IFRAME_LOGIN_SOURCE
-        ? IFRAME_REDIRECT_PATH
-        : DEFAULT_REDIRECT_PATH,
+  const isIframeLogin = useMemo(
+    () => isChatsIframeLogin(searchParams.toString()),
     [searchParams],
   );
   const resolvedUsername = useMemo(() => {
     const raw = username?.trim();
     return raw && raw.length > 0 ? raw : DEFAULT_USERNAME;
   }, [username]);
-  // 外部跳转参数：theme 直接调 setTheme；ticket/userId/env 持久化到 localStorage
+  // 外部跳转参数：普通登录的 theme 调 setTheme；iframe 登录由 forcedTheme 接管。
+  // ticket/userId/env 仍按既有登录存储策略持久化。
   const yUserId = searchParams.get('yUserId')?.trim() ?? '';
+  const redirectPath = useMemo(
+    () =>
+      resolvePostLoginRedirectPath(
+        searchParams.toString(),
+        yUserId ? GENERAL_QA_ROUTE : DEFAULT_REDIRECT_PATH,
+      ),
+    [searchParams, yUserId],
+  );
   const toolToken = searchParams.get('token')?.trim() ?? '';
   // 内网登录透传的访问令牌:存入 userInfo.accessToken,供 XK/PG 中任务 iframe 拼参
   const access_token = searchParams.get('access_token')?.trim() ?? '';
@@ -176,14 +184,14 @@ export default function LoginPage() {
 
   // 主题切换:无界 props.theme 优先,其次 URL query theme。两者取值约定一致
   // (dark-blue → 深色;red → 浅色;blue 暂无该主题,先用浅色代替),统一走 resolveThemeFromQuery。
-  // **嵌入模式跳过**:setTheme 会写 localStorage `strategy-theme`，跨标签污染正常系统页；
-  // 嵌入主题改由 forcedTheme（按标签页、不持久化）接管。
+  // **嵌入模式和 chats_iframe 登录跳过**:setTheme 会写 localStorage `strategy-theme`，
+  // 跨标签污染正常系统页；iframe 主题改由 forcedTheme（按标签页、不持久化）接管。
   useEffect(() => {
-    if (isEmbed) return;
+    if (isEmbed || isIframeLogin) return;
     const themeValue = wujieProps.theme || externalParams.theme;
     if (!themeValue) return;
     setTheme(resolveThemeFromQuery(themeValue));
-  }, [isEmbed, wujieProps.theme, externalParams.theme, setTheme]);
+  }, [isEmbed, isIframeLogin, wujieProps.theme, externalParams.theme, setTheme]);
 
   // ticket / userId / env 持久化（与 login 请求并行做，互不阻塞）
   useEffect(() => {
@@ -341,7 +349,7 @@ export default function LoginPage() {
           }
         }
 
-        router.replace(yUserId ? GENERAL_QA_ROUTE : redirectPath);
+        router.replace(redirectPath);
       } catch (error) {
         if (cancelled) {
           return;
@@ -371,6 +379,7 @@ export default function LoginPage() {
     taskId,
     goPath,
     redirectTo,
+    redirectPath,
     isEmbed,
   ]);