fix: map chinese language requests to zh-CN

src/pages/CategoryPage.tsx

@@ -2,7 +2,7 @@ import { useEffect, useState } from "react";
 import { useParams } from "react-router-dom";
 import { getJSON, itemsOrEmpty, type Category } from "../api";
 import { MessageStream } from "../components/messageStream/MessageStream";
-import { useI18n } from "../i18n";
+import { langQuery, useI18n } from "../i18n";
 
 export function CategoryPage() {
   const { slug = "" } = useParams();
@@ -11,7 +11,9 @@ export function CategoryPage() {
 
   useEffect(() => {
     if (!slug) return;
-    getJSON<Category[]>(`/api/categories?lang=${encodeURIComponent(lang)}`)
+    getJSON<Category[]>(
+      `/api/categories?lang=${encodeURIComponent(langQuery(lang))}`,
+    )
       .then((cats) =>
         setTitle(itemsOrEmpty(cats).find((x) => x.slug === slug)?.name ?? slug),
       )

src/pages/Home.tsx

@@ -10,7 +10,7 @@ import {
 } from "../components/LatestUpdateRow";
 import { RecommendedCard } from "../components/RecommendedCard";
 import { SectionHeader } from "../components/SectionHeader";
-import { useI18n } from "../i18n";
+import { langQuery, useI18n } from "../i18n";
 import { categoryCardLines } from "../utils/categoryDisplay";
 
 export function Home() {
@@ -23,7 +23,7 @@ export function Home() {
   const [canScrollRec, setCanScrollRec] = useState(false);
 
   useEffect(() => {
-    const q = `?lang=${encodeURIComponent(lang)}`;
+    const q = `?lang=${encodeURIComponent(langQuery(lang))}`;
     Promise.all([
       getJSON<Category[]>(`/api/categories${q}`),
       getJSON<{ items: Resource[] }>(`/api/resources/recommended${q}&limit=12`),

src/pages/SearchPage.tsx

@@ -7,7 +7,7 @@ import {
   postJSON,
   type Resource,
 } from "../api";
-import { useI18n } from "../i18n";
+import { langQuery, useI18n } from "../i18n";
 import { LANG_OPTIONS, languageLabel } from "../i18nLanguages";
 import { typeFilterLabel } from "../resourceTypeLabels";
 
@@ -80,7 +80,7 @@ export function SearchPage() {
 
   const query = useMemo(() => {
     const p = new URLSearchParams();
-    p.set("lang", lang);
+    p.set("lang", langQuery(lang));
     p.set("limit", "50");
     if (q) p.set("q", q);
     if (type && type !== "all") p.set("type", type);

src/pages/admin/AdminResourceForm.tsx

@@ -54,7 +54,7 @@ export function AdminResourceForm() {
   const [err, setErr] = useState<string | null>(null);
 
   useEffect(() => {
-    getJSON<Category[]>("/api/categories?lang=zh")
+    getJSON<Category[]>("/api/categories?lang=zh-CN")
       .then(setCats)
       .catch(() => setCats([]));
   }, []);

src/pages/admin/AdminResources.tsx

@@ -32,7 +32,7 @@ export function AdminResources() {
   const [total, setTotal] = useState(0);
 
   useEffect(() => {
-    getJSON<Category[]>("/api/categories?lang=zh")
+    getJSON<Category[]>("/api/categories?lang=zh-CN")
       .then((cats) => {
         const m: Record<number, string> = {};
         for (const c of cats) m[c.id] = c.name;