feat(i18n): standardize bilingual catalogs and tooling

apps/web/src/i18n/app-i18n-provider.tsx

@@ -19,7 +19,7 @@ import {
   I18nProvider as UiI18nProvider,
   type CalendarLocale,
 } from "@workspace/ui/components/i18n"
-import { calendarLocale as englishCalendarLocale } from "@workspace/ui/locales/en"
+import { calendarLocale as englishCalendarLocale } from "@workspace/ui/locales/en-US"
 import { calendarLocale as simplifiedChineseCalendarLocale } from "@workspace/ui/locales/zh-Hans"
 
 import { appLocales, DEFAULT_APP_LOCALE, type AppLocale } from "./app-locales"
@@ -27,7 +27,7 @@ import { AppI18nDevtool } from "./app-i18n-devtool"
 import { setAppLocale as persistAppLocale } from "@/server/app-locale.functions"
 
 const appCalendarLocales: Partial<Record<AppLocale, CalendarLocale>> = {
-  en: englishCalendarLocale,
+  "en-US": englishCalendarLocale,
   "zh-Hans": simplifiedChineseCalendarLocale,
 }
 

apps/web/src/i18n/app-language-switcher.test.tsx

@@ -7,16 +7,11 @@ import { AppLanguageSwitcher } from "./app-language-switcher"
 
 vi.mock("./app-i18n-provider", () => ({
   useAppLocale: () => ({
-    locale: "en",
+    locale: "en-US",
     setLocale: vi.fn(),
   }),
 }))
 
-vi.mock("country-flag-icons/react/1x1", () => ({
-  CN: () => <svg />,
-  US: () => <svg />,
-}))
-
 beforeAll(() => {
   vi.stubGlobal(
     "ResizeObserver",

apps/web/src/i18n/app-locales.ts

@@ -1,6 +1,6 @@
 import type { LocaleDefinition } from "@workspace/i18n"
 
-export type AppLocale = "en" | "zh-Hans"
+export type AppLocale = "en-US" | "zh-Hans"
 export type AppLocaleCountry = "CN" | "US"
 
 export interface AppLocaleDefinition extends LocaleDefinition {
@@ -16,7 +16,7 @@ export const appLocales = [
     direction: "ltr",
     languageTag: "en-US",
     label: "English",
-    locale: "en",
+    locale: "en-US",
   },
   {
     country: "CN",