fix: move AdminScopeToggle from NavDrawer to main header bar

Places the scope toggle next to the UserMenu avatar in the top-right
header area so it's always visible without opening the nav drawer.

frontend/src/App.js

@@ -7,6 +7,7 @@ import UserManagement from './components/UserManagement';
 import AuditLog from './components/AuditLog';
 import NvdSyncModal from './components/NvdSyncModal';
 import NavDrawer from './components/NavDrawer';
+import AdminScopeToggle from './components/AdminScopeToggle';
 import CalendarWidget from './components/CalendarWidget';
 import ConfirmModal from './components/ConfirmModal';
 import VulnerabilityTriagePage from './components/pages/ReportingPage';
@@ -1020,6 +1021,7 @@ export default function App() {
                   Add Entry
                 </button>
               )}
+              <AdminScopeToggle />
               <UserMenu onManageUsers={() => setShowUserManagement(true)} onAuditLog={() => setShowAuditLog(true)} />
             </div>
           </div>