Add "Experimental" flag properly (#1147)

Co-authored-by: Taichiro Suzuki <[email protected]>

Author: tbrand

packages/web/src/App.tsx

@@ -134,6 +134,7 @@ const App: React.FC = () => {
           to: '/mcp',
           icon: <PiGraph />,
           display: 'usecase' as const,
+          sub: 'Experimental',
         }
       : null,
     flowChatEnabled
@@ -150,6 +151,7 @@ const App: React.FC = () => {
           to: '/voice-chat',
           icon: <PiMicrophoneBold />,
           display: 'usecase' as const,
+          sub: 'Experimental',
         }
       : null,
     enabled('generate')