fix(35-01): replace login page card UI with immediate useEffect redirect (FIX-04)

- Remove auth check, useNavigate, useTranslation, and full card UI
- LoginPage now renders only "Signing in..." and immediately navigates to server /login
- Server /login route handles Logto OIDC redirect; no client-side logic needed

src/client/routes/login.tsx

@@ -1,52 +1,18 @@
-import { createFileRoute, useNavigate } from "@tanstack/react-router";
+import { createFileRoute } from "@tanstack/react-router";
 import { useEffect } from "react";
-import { useTranslation } from "react-i18next";
-import { useAuth } from "../hooks/useAuth";
 
 export const Route = createFileRoute("/login")({
 	component: LoginPage,
 });
 
 function LoginPage() {
-	const { t } = useTranslation();
-	const navigate = useNavigate();
-	const { data: auth, isLoading } = useAuth();
-
 	useEffect(() => {
-		if (auth?.authenticated) {
-			navigate({ to: "/" });
-		}
-	}, [auth, navigate]);
-
-	if (isLoading) {
-		return (
-			<div className="min-h-screen bg-gray-50 flex items-center justify-center">
-				<p className="text-gray-500 text-sm">{t("actions.loading")}</p>
-			</div>
-		);
-	}
-
-	return (
-		<div className="min-h-screen bg-gray-50 flex items-center justify-center px-4">
-			<div className="w-full max-w-sm">
-				<h1 className="text-xl font-semibold text-gray-900 text-center mb-6">
-					{t("auth.signInToGearBox")}
-				</h1>
-				<div className="bg-white rounded-xl border border-gray-100 p-6 space-y-4">
-					<p className="text-sm text-gray-500 text-center">
-						{t("auth.redirectDescription")}
-					</p>
-					<button
-						type="button"
-						onClick={() => {
 		window.location.href = "/login";
-						}}
-						className="w-full py-2 px-4 text-sm font-medium text-white bg-gray-700 hover:bg-gray-800 rounded-lg transition-colors"
-					>
-						{t("auth.signIn")}
-					</button>
-				</div>
-			</div>
+	}, []);
+
+	return (
+		<div className="flex items-center justify-center h-screen">
+			<p className="text-sm text-gray-500">Signing in...</p>
 		</div>
 	);
 }