功能迁移，页面整体样式修改

frontend-web/src/pages/LoginPage.tsx

@@ -1,10 +1,14 @@
 "use client";
 
-import { useParams, useRouter } from "next/navigation";
+import { useParams, useRouter, useSearchParams } from "next/navigation";
 import { useEffect, useMemo, useState } from "react";
 
 import { loginByUsername } from "@/core/auth/api";
 import { setStoredAuth } from "@/core/auth";
+import {
+  isSidebarEnabledFromSearch,
+  persistSidebarEnabled,
+} from "@/core/page-layout/sidebar-enabled";
 
 const DEFAULT_USERNAME = "guest";
 
@@ -13,6 +17,11 @@ type LoginStatus = "loading" | "success" | "error";
 export default function LoginPage() {
   const { username } = useParams<{ username?: string }>();
   const router = useRouter();
+  const searchParams = useSearchParams();
+  const sidebarEnabled = useMemo(
+    () => isSidebarEnabledFromSearch(searchParams.toString()),
+    [searchParams],
+  );
   const resolvedUsername = useMemo(() => {
     const raw = username?.trim();
     return raw && raw.length > 0 ? raw : DEFAULT_USERNAME;
@@ -32,6 +41,7 @@ export default function LoginPage() {
           return;
         }
         setStoredAuth(auth);
+        persistSidebarEnabled(sidebarEnabled);
         setStatus("success");
         router.replace("/page/workspace/chats/new");
       } catch (error) {
@@ -49,7 +59,7 @@ export default function LoginPage() {
     return () => {
       cancelled = true;
     };
-  }, [resolvedUsername, router]);
+  }, [resolvedUsername, router, sidebarEnabled]);
 
   return (
     <div className="flex min-h-screen items-center justify-center bg-background px-6">