feat(ui): show user and logout

apps/visualizer/src/App.tsx

@@ -9,6 +9,7 @@ import Tabs from './ui/Tabs';
 import MarketHeader from './features/market/MarketHeader';
 import Button from './ui/Button';
 import TopNav from './layout/TopNav';
+import AuthStatus from './layout/AuthStatus';
 
 function envNumber(name: string, fallback: number): number {
   const v = (import.meta as any).env?.[name];
@@ -155,7 +156,7 @@ export default function App() {
 
   return (
     <AppShell
-      header={<TopNav active="trade" />}
+      header={<TopNav active="trade" rightSlot={<AuthStatus />} />}
       top={<TickerBar items={topItems} />}
       main={
         <div className="tradeMain">