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

tests/lib/notifications/in-app.test.ts

@@ -0,0 +1,60 @@
+import { describe, it, expect, vi, beforeEach } from 'vitest'
+import { createInAppNotifications } from '@/lib/notifications/in-app'
+import type { SupabaseClient } from '@supabase/supabase-js'
+
+function makeSupabaseMock(rpcResult: { error: unknown } = { error: null }) {
+  return {
+    rpc: vi.fn().mockResolvedValue(rpcResult),
+  } as unknown as SupabaseClient
+}
+
+describe('createInAppNotifications', () => {
+  beforeEach(() => {
+    vi.clearAllMocks()
+  })
+
+  it('calls create_in_app_notification RPC once per recipient', async () => {
+    const supabase = makeSupabaseMock()
+    const { created } = await createInAppNotifications(supabase, [
+      { userId: 'u1', title: 'New incident', link: '/hse/incidents/i1', incidentId: 'i1' },
+      { userId: 'u2', title: 'New incident', link: '/hse/incidents/i1', incidentId: 'i1' },
+    ])
+    expect(created).toBe(2)
+    expect(supabase.rpc).toHaveBeenCalledTimes(2)
+    expect(supabase.rpc).toHaveBeenCalledWith('create_in_app_notification', {
+      p_recipient: 'u1',
+      p_title: 'New incident',
+      p_link: '/hse/incidents/i1',
+      p_incident_id: 'i1',
+      p_capa_id: null,
+    })
+  })
+
+  it('skips entries missing userId or title', async () => {
+    const supabase = makeSupabaseMock()
+    const { created } = await createInAppNotifications(supabase, [
+      { userId: '', title: 'x' },
+      { userId: 'u1', title: '' },
+    ])
+    expect(created).toBe(0)
+    expect(supabase.rpc).not.toHaveBeenCalled()
+  })
+
+  it('counts only successful inserts when RPC errors', async () => {
+    const supabase = makeSupabaseMock({ error: { message: 'boom' } })
+    const { created } = await createInAppNotifications(supabase, [
+      { userId: 'u1', title: 'x' },
+    ])
+    expect(created).toBe(0)
+  })
+
+  it('deduplicates recipients for the same notification', async () => {
+    const supabase = makeSupabaseMock()
+    const { created } = await createInAppNotifications(supabase, [
+      { userId: 'u1', title: 'same', incidentId: 'i1' },
+      { userId: 'u1', title: 'same', incidentId: 'i1' },
+    ])
+    expect(created).toBe(1)
+    expect(supabase.rpc).toHaveBeenCalledTimes(1)
+  })
+})