feat(onboarding): add conversational ChatOnboarding component

frontend/src/main.jsx

@@ -5,7 +5,7 @@ import { AuthProvider, useAuth } from './context/AuthContext'
 import App from './App.jsx'
 import RegisterPage from './pages/RegisterPage'
 import LoginPage from './pages/LoginPage'
-import OnboardingWizard from './pages/OnboardingWizard'
+import ChatOnboarding from './pages/ChatOnboarding'
 import './index.css'
 
 function ProtectedRoute({ children, requireOnboarding = true }) {
@@ -31,7 +31,7 @@ ReactDOM.createRoot(document.getElementById('root')).render(
         <Routes>
           <Route path="/register" element={<AuthRoute><RegisterPage /></AuthRoute>} />
           <Route path="/login" element={<AuthRoute><LoginPage /></AuthRoute>} />
-          <Route path="/onboarding" element={<ProtectedRoute requireOnboarding={false}><OnboardingWizard /></ProtectedRoute>} />
+          <Route path="/onboarding" element={<ProtectedRoute requireOnboarding={false}><ChatOnboarding /></ProtectedRoute>} />
           <Route path="/*" element={<ProtectedRoute><App /></ProtectedRoute>} />
         </Routes>
       </AuthProvider>