Change log

-   config.ts
    -   line 72 remove type confirmation of x as x always has type 'number'
    -   line 135 remove redundant local variable
-   chat.ts
    -   delete unused import

app/locales/index.ts

@@ -65,7 +65,7 @@ export const ALL_LANG_OPTIONS: Record<Lang, string> = {
 };
 
 const LANG_KEY = "lang";
-const DEFAULT_LANG = "en";
+const DEFAULT_LANG = "cn";
 
 const fallbackLang = en;
 const targetLang = ALL_LANGS[getLang()] as LocaleType;