fix: sync language prefixes

src/i18n.tsx

@@ -5,7 +5,11 @@ import React, {
   useMemo,
   useState,
 } from "react";
-import { languageForHomePathname } from "./languageRoutes";
+import {
+  languageForHomePathname,
+  languageFromPathname,
+  langPathPrefix,
+} from "./languageRoutes";
 import type { Dict } from "./locales/types";
 import { zhDict } from "./locales/zh-CN";
 import { enDict } from "./locales/en";
@@ -40,9 +44,14 @@ 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 path = window.location.pathname;
+    // Any URL whose first path segment is a known language prefix wins
+    // (covers /malay, /malay/browse, /korean/category/foo, etc.).
+    const homeLang = languageForHomePathname(path);
+    if (homeLang) return homeLang;
+    const deepLang = languageFromPathname(path);
+    if (langPathPrefix(deepLang)) return deepLang;
+    if (path === "/") return "en";
 
     const s = localStorage.getItem(LANG_KEY);
     if (s === "zh" || s === "zh-TW") return "zh-CN";