feat: Phase 5 & 6 — usability, compliance hardening, analytics

Phase 5 (usability + compliance):
- In-app notification bell/badge: migration 016 adds read state + per-user
  RLS + create_in_app_notification SECURITY DEFINER RPC; /api/notifications;
  wired into incident creation, CAPA assign/verify, escalation cron
- Incident closure: new POST /api/incidents/[id]/close (requires verification
  status + all CAPAs verified); migration 017 locks closed incidents at DB
  level (update/delete triggers) with append-only incident_addenda + UI panel
- Server-side pagination on HSE/supervisor incident inboxes (.range, 25/page)
- Investigation form: alcohol/urine test result + witness statement refs
  (existing schema columns, now editable)
- Type-specific intake fields: migration 018 adds incidents.type_details
  JSONB; whitelist validation; environmental/asset/security/fire field
  groups in report form; EN/MS/ZH labels; offline queue support
- JKKP 8 annual register CSV export (/api/reports/jkkp8) + dashboard button
  + January statutory deadline banner
- Admin page: user invite (service-role client), role/site/active management,
  site + zone CRUD with QR report links — replaces Phase 0 stub
- Evidence gallery thumbnails via Supabase render transform with fallback

Phase 6 (analytics):
- 12-month stacked trend chart (leading/lagging/other) + top root causes
  (lib/dashboard/trends.ts pure helpers)
- AI rising-risk zones: /api/dashboard/ai/risk-flags aggregates 90-day
  zone stats, claude-opus-4-8 forced tool_use, panel on HSE + management
  dashboards, suggestion audit-logged

Also fixes 9 pre-existing missing /ims basePath prefixes in client fetches
and download links.

132 tests passing, tsc clean, next build clean.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01CPf5Rc8QPx6V8KLEEgfKEQ

app/api/incidents/route.ts

@@ -1,9 +1,10 @@
 import { NextResponse } from 'next/server'
 import { createClient } from '@/lib/supabase/server'
-import { validateIncidentInput, type IncidentType, type MedicalStatus } from '@/lib/incidents/validate'
+import { validateIncidentInput, validateTypeDetails, type IncidentType, type MedicalStatus } from '@/lib/incidents/validate'
 import { uploadEvidenceFile, type EvidenceStage } from '@/lib/supabase/storage'
 import { sendNewIncidentEmail } from '@/lib/notifications/email'
 import { sendWhatsAppMessage } from '@/lib/notifications/whatsapp'
+import { createInAppNotifications } from '@/lib/notifications/in-app'
 import { getApiKey } from '@/lib/settings'
 
 export const dynamic = 'force-dynamic'
@@ -42,6 +43,21 @@ export async function POST(request: Request) {
     return NextResponse.json({ error: 'Validation failed', details: validation.errors }, { status: 422 })
   }
 
+  let rawDetails: Record<string, unknown> | undefined
+  if (typeof body.type_details === 'string' && body.type_details) {
+    try {
+      rawDetails = JSON.parse(body.type_details)
+    } catch {
+      return NextResponse.json({ error: 'Validation failed', details: ['type_details must be valid JSON'] }, { status: 422 })
+    }
+  } else if (body.type_details && typeof body.type_details === 'object') {
+    rawDetails = body.type_details as Record<string, unknown>
+  }
+  const detailsCheck = validateTypeDetails(input.incident_type, rawDetails)
+  if (!detailsCheck.ok) {
+    return NextResponse.json({ error: 'Validation failed', details: detailsCheck.errors }, { status: 422 })
+  }
+
   const { data: zone, error: zoneError } = await supabase
     .from('zones')
     .select('id, site_id')
@@ -63,6 +79,7 @@ export async function POST(request: Request) {
       injury_involved: input.injury_involved,
       asset_involved: input.asset_involved,
       medical_status: input.injury_involved ? (input.medical_status ?? 'none') : null,
+      type_details: detailsCheck.sanitized,
     })
     .select('id, reference_no')
     .single()
@@ -121,9 +138,20 @@ export async function POST(request: Request) {
       const siteName = (siteData as { name: string } | null)?.name ?? 'Unknown'
       const { data: recipients } = await supabase
         .from('users')
-        .select('phone')
+        .select('id, phone')
         .in('role', ['supervisor', 'hse'])
         .eq('site_id', zone.site_id)
+
+      await createInAppNotifications(
+        supabase,
+        (recipients ?? []).map((r: { id: string }) => ({
+          userId: r.id,
+          title: `New ${input.incident_type.replace(/_/g, ' ')} incident ${incident.reference_no ?? ''} at ${siteName}`,
+          link: `/hse/incidents/${incident.id}`,
+          incidentId: incident.id,
+        })),
+      )
+
       for (const r of recipients ?? []) {
         const phone = (r as { phone: string | null }).phone ?? ''
         if (!phone) continue