refactor: split frontend application features

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

frontend/src/app/AuthenticatedApp.tsx

@@ -0,0 +1,49 @@
+import { useState } from 'react'
+import { Navigate, Route, Routes } from 'react-router-dom'
+import { authStorage } from '../api/client'
+import { AppFooter } from '../components/layout/AppFooter'
+import { GoGuessHeader } from '../components/layout/GoGuessHeader'
+import { WorkspaceUtilities } from '../components/layout/WorkspaceUtilities'
+import { NotFound } from '../components/ui/NotFound'
+import { CalendarPage, InboxPage, ScheduledInterviewPage } from '../features/interviews'
+import { CreateJobPage, JobDetailPage, JobsPage } from '../features/jobs'
+import {
+  CreateParticipantPage,
+  ParticipantDetailPage,
+  ParticipantsPage,
+} from '../features/participants'
+import { QuestionLibraryPage, QuestionPage } from '../features/questions'
+import { ProfilePage, UsersPage } from '../features/users'
+
+export function AuthenticatedApp({ onLogout }: { onLogout: () => void }) {
+  const [open, setOpen] = useState(false)
+  const user = authStorage.user()
+  return (
+    <div className="app-shell">
+      <GoGuessHeader setOpen={setOpen} open={open} onLogout={onLogout} />
+      <main className="main-content">
+        <WorkspaceUtilities user={user} />
+        <div className="workspace-content">
+          <Routes>
+            <Route index element={<Navigate to="/jobs" replace />} />
+            <Route path="/jobs" element={<JobsPage />} />
+            <Route path="/jobs/new" element={<CreateJobPage />} />
+            <Route path="/jobs/:jobId" element={<JobDetailPage />} />
+            <Route path="/jobs/:jobId/questions/new" element={<QuestionPage />} />
+            <Route path="/questions" element={<QuestionLibraryPage />} />
+            <Route path="/participants" element={<ParticipantsPage />} />
+            <Route path="/participants/new" element={<CreateParticipantPage />} />
+            <Route path="/participants/:participantId" element={<ParticipantDetailPage />} />
+            <Route path="/users" element={<UsersPage />} />
+            <Route path="/profile" element={<ProfilePage />} />
+            <Route path="/inbox" element={<InboxPage />} />
+            <Route path="/calendar" element={<CalendarPage />} />
+            <Route path="/scheduled-interviews/:id" element={<ScheduledInterviewPage />} />
+            <Route path="*" element={<NotFound />} />
+          </Routes>
+        </div>
+        <AppFooter />
+      </main>
+    </div>
+  )
+}