feat: [US-016] - Admin - invite new user

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/components/Navbar.tsx

@@ -3,9 +3,10 @@ import LogoutButton from './LogoutButton'
 
 interface NavbarProps {
   userEmail: string
+  isAdmin?: boolean
 }
 
-export default function Navbar({ userEmail }: NavbarProps) {
+export default function Navbar({ userEmail, isAdmin }: NavbarProps) {
   return (
     <nav className="border-b border-zinc-200 bg-white dark:border-zinc-800 dark:bg-zinc-900">
       <div className="mx-auto max-w-7xl px-4 sm:px-6 lg:px-8">
@@ -20,6 +21,14 @@ export default function Navbar({ userEmail }: NavbarProps) {
           </div>
 
           <div className="flex items-center gap-4">
+            {isAdmin && (
+              <Link
+                href="/admin/invite"
+                className="text-sm font-medium text-blue-600 hover:text-blue-500 dark:text-blue-400 dark:hover:text-blue-300"
+              >
+                Invite User
+              </Link>
+            )}
             <span className="text-sm text-zinc-600 dark:text-zinc-400">
               {userEmail}
             </span>