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/offline/db.ts

@@ -0,0 +1,16 @@
+// Stub — full implementation in Task 5 (IndexedDB offline queue)
+// This file exists so TypeScript can resolve the dynamic import in report-form.tsx.
+
+export interface PendingReport {
+  zone_token: string
+  incident_type: string
+  description: string
+  injury_involved: boolean
+  asset_involved: boolean
+  medical_status?: string
+  created_at: string
+}
+
+export async function addPendingReport(_report: PendingReport): Promise<void> {
+  throw new Error('IndexedDB offline store not yet implemented — Task 5 will replace this stub')
+}