Fix bugs, convert thumbnail to png, add context menu

frontend/src/app/App.tsx

@@ -1,22 +1,36 @@
 import { Routes, Route, Navigate } from 'react-router-dom'
 import { LoginPage } from '../pages/LoginPage'
+import { SetupPage } from '../pages/SetupPage'
 import { HomePage } from '../pages/HomePage'
 import { EditorPage } from '../pages/EditorPage'
+import { AuthGuard } from '../features/auth/AuthGuard'
 
-/**
- * Root application component with route definitions.
- *
- * Routes:
- * - /login — password entry / first-run setup
- * - / — home page (recently edited, library, trash)
- * - /editor/:id — PDF editor workspace
- */
 export function App() {
   return (
     <Routes>
-      <Route path="/login" element={<LoginPage />} />
-      <Route path="/" element={<HomePage />} />
-      <Route path="/editor/:id" element={<EditorPage />} />
+      <Route path="/login" element={
+        <AuthGuard>
+          <LoginPage />
+        </AuthGuard>
+      } />
+      <Route path="/setup" element={
+        <AuthGuard>
+          <SetupPage />
+        </AuthGuard>
+      } />
+      
+      {/* Protected Routes */}
+      <Route path="/" element={
+        <AuthGuard>
+          <HomePage />
+        </AuthGuard>
+      } />
+      <Route path="/editor/:id" element={
+        <AuthGuard>
+          <EditorPage />
+        </AuthGuard>
+      } />
+      
       <Route path="*" element={<Navigate to="/" replace />} />
     </Routes>
   )