feat(web-i18n): add es/fr locales and expand switcher locale set

packages/i18n/package.json

@@ -0,0 +1,19 @@
+{
+  "name": "@cms/i18n",
+  "version": "0.0.1",
+  "private": true,
+  "type": "module",
+  "exports": {
+    ".": "./src/index.ts"
+  },
+  "scripts": {
+    "build": "tsc -p tsconfig.json",
+    "lint": "biome check src",
+    "typecheck": "tsc -p tsconfig.json --noEmit"
+  },
+  "devDependencies": {
+    "@cms/config": "workspace:*",
+    "@biomejs/biome": "2.3.14",
+    "typescript": "5.9.3"
+  }
+}

packages/i18n/src/index.ts

@@ -0,0 +1,16 @@
+export const locales = ["de", "en", "es", "fr"] as const
+
+export type AppLocale = (typeof locales)[number]
+
+export const defaultLocale: AppLocale = "en"
+
+export const localeLabels: Record<AppLocale, string> = {
+  de: "Deutsch",
+  en: "English",
+  es: "Español",
+  fr: "Français",
+}
+
+export function isAppLocale(value: string): value is AppLocale {
+  return locales.includes(value as AppLocale)
+}

packages/i18n/tsconfig.json

@@ -0,0 +1,8 @@
+{
+  "extends": "@cms/config/tsconfig/base",
+  "compilerOptions": {
+    "noEmit": false,
+    "outDir": "dist"
+  },
+  "include": ["src/**/*.ts"]
+}