feat: 添加国际化支持，优化语言切换器和登录界面，增强用户体验

src/i18n/hydration-t.ts

@@ -0,0 +1,46 @@
+"use client";
+
+import type { TFunction } from "i18next";
+import { useMemo } from "react";
+import { useTranslation } from "react-i18next";
+
+import { useI18nHydrated } from "@/components/i18n-hydration-provider";
+import { DEFAULT_LANGUAGE, type AppLanguage } from "@/i18n/language";
+import enEntry from "@/i18n/locales/en/entry.json";
+import neEntry from "@/i18n/locales/ne/entry.json";
+import zhEntry from "@/i18n/locales/zh/entry.json";
+
+const STATIC_ENTRY: Record<AppLanguage, typeof zhEntry> = {
+  zh: zhEntry,
+  en: enEntry,
+  ne: neEntry,
+};
+
+function getStaticValue(obj: Record<string, unknown>, key: string): string {
+  const parts = key.split(".");
+  let cur: unknown = obj;
+  for (const part of parts) {
+    if (cur == null || typeof cur !== "object") return key;
+    cur = (cur as Record<string, unknown>)[part];
+  }
+  return typeof cur === "string" ? cur : key;
+}
+
+function createStaticEntryT(): TFunction<"entry"> {
+  const fn = ((key: string) =>
+    getStaticValue(STATIC_ENTRY[DEFAULT_LANGUAGE] as Record<string, unknown>, key)) as TFunction<
+    "entry"
+  >;
+  return fn;
+}
+
+/** entry 命名空间：hydration 前固定 DEFAULT_LANGUAGE 文案，避免 SSR/客户端首屏不一致。 */
+export function useHydrationSafeEntryT(): TFunction<"entry"> {
+  const hydrated = useI18nHydrated();
+  const { t } = useTranslation("entry");
+
+  return useMemo(
+    () => (hydrated ? t : createStaticEntryT()),
+    [hydrated, t],
+  );
+}