fix notification and add billing page and contract

apps/public-site/src/components/PublicLanguageSwitcher.tsx

@@ -2,6 +2,7 @@
 
 import { useEffect, useState } from 'react'
 import { PUBLIC_SITE_LANGUAGE_COOKIE, type PublicSiteLanguage } from '@/lib/i18n'
+import { SHARED_LANGUAGE_COOKIE, SHARED_LANGUAGE_KEY, writeScopedPreference } from '@/lib/preferences'
 
 const labels: Record<PublicSiteLanguage, string> = {
   en: 'Language',
@@ -23,11 +24,12 @@ export default function PublicLanguageSwitcher({
   useEffect(() => {
     document.documentElement.lang = language
     document.documentElement.dir = language === 'ar' ? 'rtl' : 'ltr'
-    window.localStorage.setItem('public-site-language', language)
+    writeScopedPreference(SHARED_LANGUAGE_KEY, language, ['public-site-language'])
   }, [language])
 
   function handleChange(nextLanguage: PublicSiteLanguage) {
     setLanguage(nextLanguage)
+    document.cookie = `${SHARED_LANGUAGE_COOKIE}=${nextLanguage}; path=/; max-age=31536000; samesite=lax`
     document.cookie = `${PUBLIC_SITE_LANGUAGE_COOKIE}=${nextLanguage}; path=/; max-age=31536000; samesite=lax`
     window.location.reload()
   }