feat: 接入公开币种目录并统一多币种金额与语言初始化处理

src/i18n/index.ts

@@ -1,7 +1,6 @@
 "use client";
 
 import i18n from "i18next";
-import LanguageDetector from "i18next-browser-languagedetector";
 import { initReactI18next } from "react-i18next";
 
 import enCommon from "./locales/en/common.json";
@@ -60,38 +59,48 @@ export function syncDocumentLanguage(lang: AppLanguage): void {
   document.documentElement.lang = lang;
 }
 
+export function syncPreferredLanguage(): void {
+  if (typeof window === "undefined") return;
+
+  const stored = window.localStorage.getItem("i18nextLng");
+  const preferred = normalizeLanguage(stored ?? window.navigator.language);
+  const current = normalizeLanguage(i18n.resolvedLanguage ?? i18n.language);
+
+  if (preferred !== current) {
+    void i18n.changeLanguage(preferred);
+  }
+}
+
 if (!i18n.isInitialized) {
-  void i18n
-    .use(LanguageDetector)
-    .use(initReactI18next)
-    .init({
-      resources,
-      fallbackLng: DEFAULT_LANGUAGE,
-      supportedLngs: ["en", "ne", "zh"],
-      defaultNS: "common",
-      ns: [...namespaces],
-      /** zh-CN → zh，ne-NP → ne，未匹配时用 fallbackLng */
-      load: "languageOnly",
+  void i18n.use(initReactI18next).init({
+    resources,
+    fallbackLng: DEFAULT_LANGUAGE,
+    supportedLngs: ["en", "ne", "zh"],
+    defaultNS: "common",
+    ns: [...namespaces],
+    /** 始终先用默认语言完成 SSR / 首次 hydration，避免首屏文本不一致 */
+    load: "languageOnly",
+    lng: DEFAULT_LANGUAGE,
+    initImmediate: false,
 
-      detection: {
-        order: ["localStorage", "navigator"],
-        caches: ["localStorage"],
-        lookupLocalStorage: "i18nextLng",
-      },
+    interpolation: {
+      escapeValue: false,
+    },
 
-      interpolation: {
-        escapeValue: false,
-      },
-
-      react: {
-        useSuspense: false,
-      },
-    });
+    react: {
+      useSuspense: false,
+    },
+  });
 
   syncDocumentLanguage(normalizeLanguage(i18n.resolvedLanguage ?? i18n.language));
 
   i18n.on("languageChanged", (lang) => {
-    syncDocumentLanguage(normalizeLanguage(lang));
+    const next = normalizeLanguage(lang);
+    syncDocumentLanguage(next);
+
+    if (typeof window !== "undefined") {
+      window.localStorage.setItem("i18nextLng", next);
+    }
   });
 }