feat: transport incidents with truck number support

- DB: trucks table + incidents.truck_id FK + transport enum value
- Validation: transport type requires truck_id
- Create API: validates truck exists/active, persists truck_id
- Report form: truck dropdown shown when type=transport (required)
- Admin: TruckManager CRUD + /api/admin/trucks route
- Detail: trucks join surfaced in incident-detail + detail page query
- Inbox (HSE + supervisor): truck filter, transport in TYPE_OPTIONS,
  fixed stale enum values (dropped dangerous_occurrence/mhe_asset/occupational_disease)
- List: transport label + truck number badge in rows
- i18n: transport + truckLabel/truckPlaceholder in en/ms/zh

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01CPf5Rc8QPx6V8KLEEgfKEQ

components/incidents/incident-list.tsx

@@ -11,6 +11,7 @@ const TYPE_LABELS: Record<string, string> = {
   environmental: 'Environmental',
   security: 'Security',
   fire: 'Fire / Emergency',
+  transport: 'Transport / Vehicle',
 }
 
 const STATUS_COLORS: Record<string, string> = {
@@ -31,6 +32,7 @@ export type Incident = {
   reported_at: string
   sites: { name: string } | null
   zones: { name: string } | null
+  trucks: { truck_no: string } | null
   reporter: { name: string } | null
 }
 
@@ -113,6 +115,9 @@ export function IncidentList({ incidents, basePath }: Props) {
                   {TYPE_LABELS[inc.incident_type] ?? inc.incident_type}
                   {inc.zones?.name && ` · ${inc.zones.name}`}
                   {inc.sites?.name && ` · ${inc.sites.name}`}
+                  {inc.trucks?.truck_no && (
+                    <span className="ml-1 text-xs text-gray-400">· {inc.trucks.truck_no}</span>
+                  )}
                 </div>
               </div>
               <div className="ml-4 text-right">