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-detail.tsx

@@ -8,6 +8,7 @@ const TYPE_LABELS: Record<string, string> = {
   environmental: 'Environmental',
   security: 'Security',
   fire: 'Fire / Emergency',
+  transport: 'Transport / Vehicle',
 }
 
 const STATUS_COLORS: Record<string, string> = {
@@ -42,6 +43,7 @@ export type Incident = {
   type_details?: Record<string, string | boolean> | null
   sites: { id: string; name: string } | null
   zones: { id: string; name: string } | null
+  trucks: { id: string; truck_no: string; carrier: string | null } | null
   reporter: { id: string; name: string; email: string } | null
   evidence_files: Array<{
     id: string
@@ -86,6 +88,12 @@ export function IncidentDetail({ incident }: Props) {
         <dl className="grid grid-cols-2 gap-4 sm:grid-cols-3">
           <Field label="Site" value={incident.sites?.name} />
           <Field label="Zone" value={incident.zones?.name} />
+          {incident.trucks && (
+            <Field
+              label="Truck"
+              value={`${incident.trucks.truck_no}${incident.trucks.carrier ? ` — ${incident.trucks.carrier}` : ''}`}
+            />
+          )}
           <Field label="Reported by" value={incident.reporter?.name} />
           <Field label="Reported at" value={new Date(incident.reported_at).toLocaleString('en-MY', { timeZone: 'Asia/Kuala_Lumpur' })} />
           <Field label="Severity" value={incident.severity ? `Level ${incident.severity}` : 'Not yet assigned'} />