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/incidents/validate.test.ts

@@ -1,5 +1,5 @@
 import { describe, it, expect } from 'vitest'
-import { validateIncidentInput, type IncidentInput } from '@/lib/incidents/validate'
+import { validateIncidentInput, validateTypeDetails, type IncidentInput } from '@/lib/incidents/validate'
 
 const valid: IncidentInput = {
   zone_token: 'scw1-dock-a-qr-2026',
@@ -43,3 +43,42 @@ describe('validateIncidentInput', () => {
     expect(result.errors).toContain('incident_type is invalid')
   })
 })
+
+describe('validateTypeDetails', () => {
+  it('accepts valid environmental fields and trims strings', () => {
+    const r = validateTypeDetails('environmental', {
+      substance: '  diesel  ',
+      containment_deployed: true,
+    })
+    expect(r.ok).toBe(true)
+    expect(r.sanitized).toEqual({ substance: 'diesel', containment_deployed: true })
+  })
+
+  it('returns null sanitized when details empty or undefined', () => {
+    expect(validateTypeDetails('fire', undefined).sanitized).toBeNull()
+    expect(validateTypeDetails('fire', {}).sanitized).toBeNull()
+  })
+
+  it('rejects unknown fields', () => {
+    const r = validateTypeDetails('asset_damage', { equipment_id: 'FLT-3', bogus: 'x' })
+    expect(r.ok).toBe(false)
+    expect(r.errors[0]).toContain('bogus')
+  })
+
+  it('rejects wrong value types', () => {
+    const r = validateTypeDetails('security', { police_reported: 'yes' })
+    expect(r.ok).toBe(false)
+    expect(r.errors[0]).toContain('boolean')
+  })
+
+  it('rejects details for types without extra fields', () => {
+    const r = validateTypeDetails('near_miss', { substance: 'oil' })
+    expect(r.ok).toBe(false)
+  })
+
+  it('drops empty strings from sanitized output', () => {
+    const r = validateTypeDetails('asset_damage', { equipment_id: '   ', loto_applied: false })
+    expect(r.ok).toBe(true)
+    expect(r.sanitized).toEqual({ loto_applied: false })
+  })
+})