Add super-admin invoices: settings templates and per-business issue flow.

Platform invoice templates live under Settings; each business can list and issue invoices with optional name and a meshkee.com public link.

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/super-admin/src/components/Sidebar.tsx

@@ -1,5 +1,5 @@
 import { NavLink, useNavigate } from 'react-router-dom'
-import { Home, Building2, Users, Globe, HelpCircle, LogOut } from 'lucide-react'
+import { Home, Building2, Users, Globe, Settings, HelpCircle, LogOut } from 'lucide-react'
 import { useAuth } from '../context/AuthContext'
 import meshkeeLogo from '../assets/meshkee-logo.png'
 import styles from './Sidebar.module.css'
@@ -9,6 +9,7 @@ const navItems = [
   { icon: Building2, label: 'Businesses', to: '/businesses' },
   { icon: Users, label: 'Users', to: '/users' },
   { icon: Globe, label: 'Websites', to: '/websites' },
+  { icon: Settings, label: 'Settings', to: '/settings' },
 ]
 
 const footerItems = [