Initial import: property management SaaS + security hardening + admin dashboard

Property Management Network — Next.js 16 (App Router), Better Auth,
Drizzle ORM over PostgreSQL, Stripe, OpenAI, Resend.

Includes:
- Security hardening: access-control/IDOR fixes, TLS-by-default DB layer,
  constant-time cron auth, strict security headers, atomic AI quota gating,
  HTML/email output encoding, demo-backdoor disabled in production.
- Superadmin dashboard at /admin (overview/MRR, server-paginated users with
  ban/impersonate/plan/delete, billing, platform activity + admin audit log,
  AI usage, system health) via the Better Auth admin plugin.
- Seed/migration utility scripts under scripts/.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

app/(dashboard)/error.tsx

@@ -0,0 +1,35 @@
+"use client"
+
+import { useEffect } from "react"
+import { AlertTriangle, RefreshCw } from "lucide-react"
+
+export default function DashboardError({
+  error,
+  reset,
+}: {
+  error: Error & { digest?: string }
+  reset: () => void
+}) {
+  useEffect(() => {
+    console.error(error)
+  }, [error])
+
+  return (
+    <div className="flex min-h-[400px] flex-col items-center justify-center rounded-xl border border-red-500/10 bg-red-500/5 text-center">
+      <div className="flex h-12 w-12 items-center justify-center rounded-full bg-red-500/10 mb-4">
+        <AlertTriangle className="h-6 w-6 text-red-400" />
+      </div>
+      <h2 className="text-base font-semibold text-white">Something went wrong</h2>
+      <p className="mt-2 max-w-sm text-sm text-white/50">
+        {error.message || "An unexpected error occurred. Try refreshing the page."}
+      </p>
+      <button
+        onClick={reset}
+        className="mt-6 flex items-center gap-2 rounded-lg border border-white/10 px-4 py-2 text-sm text-white/60 transition hover:border-white/20 hover:text-white"
+      >
+        <RefreshCw className="h-4 w-4" />
+        Try again
+      </button>
+    </div>
+  )
+}