feat: i18n — EN/MS/ZH translations with cookie-based locale switching, report form translated

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01FFDuBhMKvoWjrWT3ZnGmmr

lib/i18n/server.ts

@@ -0,0 +1,20 @@
+import { cookies } from 'next/headers'
+import { SUPPORTED_LOCALES, type Locale } from './locales'
+import type { Messages } from './context'
+
+export async function getLocale(): Promise<Locale> {
+  const cookieStore = await cookies()
+  const lang = cookieStore.get('locale')?.value
+  if (lang && (SUPPORTED_LOCALES as readonly string[]).includes(lang)) {
+    return lang as Locale
+  }
+  return 'en'
+}
+
+export async function loadMessages(locale: Locale): Promise<Messages> {
+  switch (locale) {
+    case 'ms': return (await import('../../messages/ms.json')).default as Messages
+    case 'zh': return (await import('../../messages/zh.json')).default as Messages
+    default:   return (await import('../../messages/en.json')).default as Messages
+  }
+}