Fix landing locale toggle cache path

frontend/components/landing/LandingLocaleToggle.tsx

@@ -1,9 +1,8 @@
 "use client";
 
-import { useTransition } from "react";
-import { useRouter } from "next/navigation";
 import {
   LANDING_LOCALE_COOKIE,
+  LANDING_LOCALE_QUERY_PARAM,
   nextLandingLocale,
   type LandingLocale,
 } from "@/components/landing/landingLocale";
@@ -11,8 +10,6 @@ import {
 const ONE_YEAR_SECONDS = 60 * 60 * 24 * 365;
 
 export function LandingLocaleToggle({ locale }: { locale: LandingLocale }) {
-  const router = useRouter();
-  const [isPending, startTransition] = useTransition();
   const isEn = locale === "en-US";
 
   const toggleLocale = () => {
@@ -24,16 +21,16 @@ export function LandingLocaleToggle({ locale }: { locale: LandingLocale }) {
     } catch {
       // Locale persistence is best-effort; the cookie is enough for SSR.
     }
-    startTransition(() => {
-      router.refresh();
-    });
+
+    const url = new URL(window.location.href);
+    url.searchParams.set(LANDING_LOCALE_QUERY_PARAM, nextLocale);
+    window.location.assign(url.toString());
   };
 
   return (
     <button
       type="button"
       onClick={toggleLocale}
-      disabled={isPending}
       className="inline-flex h-9 cursor-pointer items-center gap-1 rounded-md border border-slate-200 bg-white px-1 text-xs font-semibold text-slate-500 shadow-sm hover:border-slate-300 disabled:cursor-wait disabled:opacity-70"
       aria-label={isEn ? "Switch language" : "切换语言"}
     >