perf: make root HTML cacheable by dropping per-request CSP nonce

app/[locale]/layout.tsx

@@ -18,15 +18,8 @@ export default async function LocaleLayout({
 
   if (!(locales as readonly string[]).includes(locale)) notFound();
 
-  let messages;
-  try {
-    messages = (await import(`@/locales/${locale}/common.json`)).default;
-  } catch {
-    notFound();
-  }
-
   return (
-    <IntlProvider locale={locale} messages={messages}>
+    <IntlProvider locale={locale}>
       <ThemeProvider>
         <CalendarAlertProvider>
           <RateLimitToastProvider>