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/shared/send-reminder-button.tsx

@@ -0,0 +1,33 @@
+"use client"
+
+import { useState } from "react"
+import { Bell, Loader2 } from "lucide-react"
+import { toast } from "sonner"
+
+export function SendReminderButton({ tenantId, paymentId }: { tenantId: string; paymentId: string }) {
+  const [loading, setLoading] = useState(false)
+
+  async function send() {
+    setLoading(true)
+    const res = await fetch("/api/notifications", {
+      method: "POST",
+      headers: { "Content-Type": "application/json" },
+      body: JSON.stringify({ type: "rent_reminder", tenant_id: tenantId, payment_id: paymentId }),
+    })
+    setLoading(false)
+    if (res.ok) toast.success("Reminder sent")
+    else toast.error("Failed to send reminder")
+  }
+
+  return (
+    <button
+      onClick={send}
+      disabled={loading}
+      title="Send rent reminder"
+      className="flex h-7 items-center gap-1.5 rounded-md border border-white/10 px-2.5 text-xs text-white/50 transition hover:border-amber-500/30 hover:text-amber-400 disabled:opacity-40"
+    >
+      {loading ? <Loader2 className="h-3 w-3 animate-spin" /> : <Bell className="h-3 w-3" />}
+      Remind
+    </button>
+  )
+}