feat: fix logout button, inactivity tracker, and concurrent session termination

shop/app/admin/layout.tsx

@@ -1,8 +1,8 @@
 import Link from 'next/link'
 import { LayoutDashboard, Package, Settings, Users, LogOut, LayoutGrid, ShoppingCart } from 'lucide-react'
-
 import { redirect } from 'next/navigation'
 import { createClient } from '@/lib/supabase/server'
+import { AdminLogoutButton } from '@/components/admin/logout-menu-item'
 
 export default async function AdminLayout({
   children,
@@ -64,10 +64,7 @@ export default async function AdminLayout({
         </nav>
 
         <div className="p-4 border-t border-white/5 space-y-4">
-          <button className="flex w-full items-center gap-3 px-3 py-2 rounded-lg text-slate-400 hover:text-white hover:bg-white/5 transition-all">
-            <LogOut className="w-5 h-5" />
-            Abmelden
-          </button>
+          <AdminLogoutButton />
           <div className="px-3 pt-2 flex items-center gap-2 border-t border-white/5 opacity-60">
             <span className="font-bold text-sm tracking-tighter text-white">CASPOS Store</span>
             <span className="text-[10px] bg-amber-500/20 text-amber-400 px-2 py-0.5 rounded-full font-semibold uppercase tracking-wider border border-amber-500/30">