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/reports/jkkp8/route.ts

@@ -0,0 +1,54 @@
+export const dynamic = 'force-dynamic'
+
+import { NextRequest, NextResponse } from 'next/server'
+import { createClient } from '@/lib/supabase/server'
+import { buildJkkp8Rows, jkkp8Csv, type Jkkp8Incident } from '@/lib/reports/jkkp8'
+
+export async function GET(request: NextRequest) {
+  const supabase = await createClient()
+  const { data: { user }, error: authError } = await supabase.auth.getUser()
+  if (authError || !user) return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })
+
+  const { data: profile } = await supabase
+    .from('users').select('role').eq('id', user.id).single()
+  if (!profile || !['hse', 'admin'].includes(profile.role))
+    return NextResponse.json({ error: 'Forbidden' }, { status: 403 })
+
+  const yearParam = request.nextUrl.searchParams.get('year')
+  const year = Number.parseInt(yearParam ?? '', 10) || new Date().getFullYear()
+
+  const { data: incidents, error } = await supabase
+    .from('incidents')
+    .select(`
+      reference_no, incident_type, description, reported_at,
+      medical_status, lost_days,
+      is_fatality, is_serious_bodily_injury, is_dangerous_occurrence, is_occupational_disease,
+      sites (name),
+      zones (name),
+      reporter:users!reported_by (name),
+      dosh_reports (form_type, status, submitted_at)
+    `)
+    .gte('reported_at', `${year}-01-01T00:00:00Z`)
+    .lt('reported_at', `${year + 1}-01-01T00:00:00Z`)
+    .order('reported_at', { ascending: true })
+
+  if (error) return NextResponse.json({ error: 'Fetch failed' }, { status: 500 })
+
+  const rows = buildJkkp8Rows((incidents ?? []) as unknown as Jkkp8Incident[])
+  const csv = jkkp8Csv(rows)
+
+  await supabase.rpc('write_audit_log', {
+    p_table_name: 'incidents',
+    p_record_id: user.id,
+    p_action: 'jkkp8_register_export',
+    p_new_value: { year, row_count: rows.length },
+  })
+
+  return new NextResponse(csv, {
+    status: 200,
+    headers: {
+      'Content-Type': 'text/csv; charset=utf-8',
+      'Content-Disposition': `attachment; filename="jkkp8-register-${year}.csv"`,
+    },
+  })
+}