feat(auth): phase 3 — replace Supabase GoTrue with bcryptjs+jose

Custom auth stack: bcryptjs password hashing (cost 10, GoTrue-compatible),
jose JWT session cookies (edge-safe, 8hr TTL), new API routes for
login/logout/reset/change-password, middleware rewritten to JWT-only
verification with no DB access. All 38 protected pages and API routes
migrated from supabase.auth.getUser() to getSession(). Supabase .from()
queries retained for Phase 4. lib/db/index.ts refactored to lazy Proxy
singleton to avoid module-level throw during Next.js build.

tsc: clean, build: clean, tests: 4/4 passed

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/(protected)/hse/incidents/[id]/triage/page.tsx

@@ -3,6 +3,7 @@ export const dynamic = 'force-dynamic'
 import { notFound, redirect } from 'next/navigation'
 import Link from 'next/link'
 import { createClient } from '@/lib/supabase/server'
+import { getSession } from '@/lib/auth/get-session'
 import { TriageForm } from '@/components/incidents/triage-form'
 
 interface Props {
@@ -11,15 +12,12 @@ interface Props {
 
 export default async function TriagePage({ params }: Props) {
   const { id } = await params
+  const session = await getSession()
+  if (!session) redirect(`/login?redirect=/hse/incidents/${id}/triage`)
+  if (!['hse', 'admin'].includes(session.role)) redirect('/hse/incidents')
+
   const supabase = await createClient()
 
-  const { data, error: authError } = await supabase.auth.getUser()
-  if (authError || !data?.user) redirect(`/login?redirect=/hse/incidents/${id}/triage`)
-
-  const { data: profile } = await supabase
-    .from('users').select('role').eq('id', data.user.id).single()
-  if (!profile || !['hse', 'admin'].includes(profile.role)) redirect('/hse/incidents')
-
   const { data: incident } = await supabase
     .from('incidents')
     .select('id, reference_no, incident_type, status, severity')