ui: persist onboarding wizard across route redirects

ui/src/App.tsx

@@ -196,13 +196,13 @@ function NoCompaniesStartPage({ autoOpen = true }: { autoOpen?: boolean }) {
           <Button onClick={() => openOnboarding()}>New Company</Button>
         </div>
       </div>
-      <OnboardingWizard />
     </div>
   );
 }
 
 export function App() {
   return (
+    <>
       <Routes>
         <Route path="auth" element={<AuthPage />} />
         <Route path="board-claim/:token" element={<BoardClaimPage />} />
@@ -227,5 +227,7 @@ export function App() {
           </Route>
         </Route>
       </Routes>
+      <OnboardingWizard />
+    </>
   );
 }

ui/src/components/Layout.tsx

@@ -12,7 +12,6 @@ import { NewIssueDialog } from "./NewIssueDialog";
 import { NewProjectDialog } from "./NewProjectDialog";
 import { NewGoalDialog } from "./NewGoalDialog";
 import { NewAgentDialog } from "./NewAgentDialog";
-import { OnboardingWizard } from "./OnboardingWizard";
 import { ToastViewport } from "./ToastViewport";
 import { MobileBottomNav } from "./MobileBottomNav";
 import { useDialog } from "../context/DialogContext";
@@ -296,7 +295,6 @@ export function Layout() {
       <NewProjectDialog />
       <NewGoalDialog />
       <NewAgentDialog />
-      <OnboardingWizard />
       <ToastViewport />
     </div>
   );