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>

components/forms/csv-export-button.tsx

@@ -0,0 +1,46 @@
+"use client"
+
+import { useState } from "react"
+import { Download } from "lucide-react"
+import { toast } from "sonner"
+
+interface Props {
+  endpoint: string          // e.g. "/api/export/rent" or "/api/export/tenants"
+  filename: string          // e.g. "rent-payments.csv"
+  label?: string
+}
+
+export function CsvExportButton({ endpoint, filename, label = "Export CSV" }: Props) {
+  const [loading, setLoading] = useState(false)
+
+  async function handleExport() {
+    setLoading(true)
+    try {
+      const res = await fetch(endpoint)
+      if (!res.ok) throw new Error("Export failed")
+      const blob = await res.blob()
+      const url = URL.createObjectURL(blob)
+      const a = document.createElement("a")
+      a.href = url
+      a.download = filename
+      a.click()
+      URL.revokeObjectURL(url)
+      toast.success(`${filename} downloaded`)
+    } catch {
+      toast.error("Failed to export CSV")
+    } finally {
+      setLoading(false)
+    }
+  }
+
+  return (
+    <button
+      onClick={handleExport}
+      disabled={loading}
+      className="flex items-center gap-2 rounded-lg border border-white/10 px-3 py-2 text-sm text-white/60 hover:border-white/20 hover:text-white transition disabled:opacity-40"
+    >
+      <Download className="h-4 w-4" />
+      {loading ? "Exporting…" : label}
+    </button>
+  )
+}