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/(protected)/admin/page.tsx

@@ -1,9 +1,37 @@
-// app/(protected)/admin/page.tsx
-export default function AdminHome() {
+export const dynamic = 'force-dynamic'
+
+import { redirect } from 'next/navigation'
+import { createClient } from '@/lib/supabase/server'
+import { UserManager, type AdminUser, type SiteOption } from '@/components/admin/user-manager'
+import { SiteZoneManager, type SiteWithZones } from '@/components/admin/site-zone-manager'
+
+export default async function AdminHome() {
+  const supabase = await createClient()
+  const { data: { user } } = await supabase.auth.getUser()
+  if (!user) redirect('/login')
+
+  const { data: profile } = await supabase
+    .from('users').select('role').eq('id', user.id).single()
+  if (!profile || profile.role !== 'admin') redirect('/login')
+
+  const [{ data: users }, { data: sites }] = await Promise.all([
+    supabase
+      .from('users')
+      .select('id, name, email, role, department, site_id, active')
+      .order('created_at', { ascending: false }),
+    supabase
+      .from('sites')
+      .select('id, name, address, zones (id, name, qr_code_token)')
+      .order('name'),
+  ])
+
+  const siteOptions: SiteOption[] = (sites ?? []).map(s => ({ id: s.id, name: s.name }))
+
   return (
-    <main className="p-8 max-w-4xl mx-auto">
-      <h1 className="text-2xl font-bold">Admin Dashboard</h1>
-      <p className="mt-2 text-gray-500">Phase 0: User management and site config coming here.</p>
+    <main className="max-w-4xl mx-auto px-4 py-6 space-y-6">
+      <h1 className="text-2xl font-bold text-gray-900">Admin</h1>
+      <UserManager users={(users ?? []) as AdminUser[]} sites={siteOptions} />
+      <SiteZoneManager sites={(sites ?? []) as unknown as SiteWithZones[]} />
     </main>
   )
 }