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)/hse/dashboard/page.tsx

@@ -3,6 +3,8 @@ export const dynamic = 'force-dynamic'
 import Link from 'next/link'
 import { createClient } from '@/lib/supabase/server'
 import { StatCard } from '@/components/dashboard/stat-card'
+import { bucketIncidentsByMonth, topRootCauses } from '@/lib/dashboard/trends'
+import { RiskFlagsPanel } from '@/components/dashboard/risk-flags-panel'
 
 const TYPE_LABELS: Record<string, string> = {
   injury: 'Injury',
@@ -22,6 +24,7 @@ export default async function HseDashboardPage() {
   thirtyDaysAgo.setDate(now.getDate() - 30)
   const ninetyDaysAgo = new Date(now)
   ninetyDaysAgo.setDate(now.getDate() - 90)
+  const twelveMonthsAgo = new Date(Date.UTC(now.getUTCFullYear(), now.getUTCMonth() - 11, 1))
 
   const [
     { data: incidents },
@@ -29,6 +32,8 @@ export default async function HseDashboardPage() {
     { data: zoneIncidents },
     { data: completedCapas },
     { data: doshPendingRows },
+    { data: yearIncidents },
+    { data: investigations },
   ] = await Promise.all([
     supabase.from('incidents').select('id, status, incident_type, sites (name)'),
     supabase
@@ -48,6 +53,14 @@ export default async function HseDashboardPage() {
       .from('dosh_reports')
       .select('id')
       .eq('status', 'pending'),
+    supabase
+      .from('incidents')
+      .select('reported_at, incident_type')
+      .gte('reported_at', twelveMonthsAgo.toISOString()),
+    supabase
+      .from('investigations')
+      .select('root_cause_summary')
+      .not('root_cause_summary', 'is', null),
   ])
 
   // --- Existing metrics ---
@@ -105,23 +118,47 @@ export default async function HseDashboardPage() {
   // --- DOSH pending filings ---
   const doshPendingCount = doshPendingRows?.length ?? 0
 
+  // --- 12-month trend + top root causes ---
+  const monthly = bucketIncidentsByMonth(yearIncidents ?? [], 12, now)
+  const monthlyMax = Math.max(1, ...monthly.map(m => m.total))
+  const rootCauses = topRootCauses(investigations ?? [])
+
   return (
     <main className="max-w-4xl mx-auto px-4 py-6">
       <div className="flex items-center justify-between mb-6">
         <h1 className="text-2xl font-bold text-gray-900">Dashboard</h1>
         <div className="flex gap-3">
           <a
-            href="/api/dashboard/export?role=hse"
+            href="/ims/api/dashboard/export?role=hse"
             className="text-sm text-gray-500 hover:text-gray-700 border border-gray-200 rounded-lg px-3 py-1.5"
           >
             Export CSV
           </a>
+          <a
+            href={`/ims/api/reports/jkkp8?year=${now.getFullYear()}`}
+            className="text-sm text-gray-500 hover:text-gray-700 border border-gray-200 rounded-lg px-3 py-1.5"
+          >
+            JKKP 8 Register
+          </a>
           <Link href="/hse/incidents" className="text-sm text-blue-600 hover:underline">
             View all incidents →
           </Link>
         </div>
       </div>
 
+      {/* JKKP 8 statutory deadline reminder — register due to DOSH before 31 January */}
+      {now.getMonth() === 0 && (
+        <div className="bg-amber-50 border border-amber-200 rounded-xl p-4 mb-6">
+          <p className="text-sm text-amber-800">
+            <strong>JKKP 8 annual register due:</strong> the {now.getFullYear() - 1} register must be
+            submitted to DOSH before 31 January {now.getFullYear()}.{' '}
+            <a href={`/ims/api/reports/jkkp8?year=${now.getFullYear() - 1}`} className="underline font-medium">
+              Download {now.getFullYear() - 1} register
+            </a>
+          </p>
+        </div>
+      )}
+
       {/* Summary stats */}
       <div className="grid grid-cols-2 gap-4 sm:grid-cols-4 mb-6">
         <StatCard label="Total Incidents" value={total} />
@@ -161,6 +198,54 @@ export default async function HseDashboardPage() {
         </div>
       </div>
 
+      <RiskFlagsPanel />
+
+      {/* 12-month incident trend */}
+      <div className="bg-white rounded-xl shadow-sm p-5 mb-4">
+        <h2 className="text-sm font-semibold text-gray-700 uppercase tracking-wide mb-1">
+          Incident Trend — Last 12 Months
+        </h2>
+        <p className="text-xs text-gray-400 mb-4">
+          Blue: leading (hazard + near miss) · Red: lagging (injury) · Grey: other
+        </p>
+        <div className="flex items-end gap-1 h-32">
+          {monthly.map(m => {
+            const other = m.total - m.leading - m.lagging
+            return (
+              <div key={m.month} className="flex-1 flex flex-col items-center gap-1">
+                <div className="w-full flex flex-col-reverse" style={{ height: '100px' }}>
+                  <div className="w-full bg-blue-400" style={{ height: `${(m.leading / monthlyMax) * 100}px` }} />
+                  <div className="w-full bg-red-400" style={{ height: `${(m.lagging / monthlyMax) * 100}px` }} />
+                  <div className="w-full bg-gray-300" style={{ height: `${(Math.max(0, other) / monthlyMax) * 100}px` }} />
+                </div>
+                <span className="text-[10px] text-gray-400">{m.label}</span>
+                <span className="text-[10px] font-semibold text-gray-600">{m.total || ''}</span>
+              </div>
+            )
+          })}
+        </div>
+      </div>
+
+      {/* Top root causes */}
+      {rootCauses.length > 0 && (
+        <div className="bg-white rounded-xl shadow-sm p-5 mb-4">
+          <h2 className="text-sm font-semibold text-gray-700 uppercase tracking-wide mb-4">
+            Top Root Causes
+          </h2>
+          <ol className="space-y-2">
+            {rootCauses.map((rc, i) => (
+              <li key={rc.cause} className="flex items-start justify-between gap-3">
+                <span className="text-sm text-gray-700">
+                  <span className="text-gray-400 mr-2">{i + 1}.</span>
+                  {rc.cause}
+                </span>
+                <span className="text-sm font-semibold text-gray-900 shrink-0">{rc.count}×</span>
+              </li>
+            ))}
+          </ol>
+        </div>
+      )}
+
       {/* Zone heatmap — last 90 days */}
       {by_zone.length > 0 && (
         <div className="bg-white rounded-xl shadow-sm p-5 mb-4">