feat: add localized home routes

src/i18n.tsx

@@ -5,6 +5,7 @@ import React, {
   useMemo,
   useState,
 } from "react";
+import { languageForHomePathname } from "./languageRoutes";
 
 export type Lang = "zh-CN" | "en" | "ja" | "ko" | "vi" | "id" | "ms";
 
@@ -372,6 +373,10 @@ const LANG_KEY = "ark_lang";
 
 export function I18nProvider({ children }: { children: React.ReactNode }) {
   const [lang, setLangState] = useState<Lang>(() => {
+    const routeLang = languageForHomePathname(window.location.pathname);
+    if (routeLang) return routeLang;
+    if (window.location.pathname === "/") return "en";
+
     const s = localStorage.getItem(LANG_KEY);
     if (s === "zh" || s === "zh-TW") return "zh-CN";
     if (
@@ -386,10 +391,10 @@ export function I18nProvider({ children }: { children: React.ReactNode }) {
       return s;
     return "en";
   });
-  const setLang = (l: Lang) => {
+  const setLang = useCallback((l: Lang) => {
     localStorage.setItem(LANG_KEY, l);
     setLangState(l);
-  };
+  }, []);
   const t = useCallback(
     (k: string) => dict[lang][k] || dict.en[k] || k,
     [lang],