Fix navigation for logged-out users

Fixes a bug where clicking on Profile Management, Notification Settings, or Security & Privacy in Settings while logged out resulted in a 404 error.

src/App.tsx

@@ -1,4 +1,3 @@
-
 import React from 'react';
 import { BrowserRouter as Router, Route, Routes } from 'react-router-dom';
 import './App.css';
@@ -19,6 +18,7 @@ import Analytics from './pages/Analytics';
 import PaymentMethods from './pages/PaymentMethods';
 import Settings from './pages/Settings';
 import { BudgetProvider } from './contexts/BudgetContext';
+import PrivateRoute from './components/auth/PrivateRoute';
 
 // 전역 오류 핸들러
 const handleError = (error: any) => {
@@ -83,15 +83,39 @@ function App() {
                   <Route path="/" element={<Index />} />
                   <Route path="/login" element={<Login />} />
                   <Route path="/register" element={<Register />} />
-                  <Route path="/profile" element={<ProfileManagement />} />
+                  <Route path="/profile" element={
+                    <PrivateRoute>
+                      <ProfileManagement />
+                    </PrivateRoute>
+                  } />
                   <Route path="/settings" element={<Settings />} />
-                  <Route path="/transactions" element={<Transactions />} />
-                  <Route path="/security-privacy" element={<SecurityPrivacySettings />} />
-                  <Route path="/notifications" element={<NotificationSettings />} />
+                  <Route path="/transactions" element={
+                    <PrivateRoute>
+                      <Transactions />
+                    </PrivateRoute>
+                  } />
+                  <Route path="/security-privacy" element={
+                    <PrivateRoute>
+                      <SecurityPrivacySettings />
+                    </PrivateRoute>
+                  } />
+                  <Route path="/notifications" element={
+                    <PrivateRoute>
+                      <NotificationSettings />
+                    </PrivateRoute>
+                  } />
                   <Route path="/help-support" element={<HelpSupport />} />
                   <Route path="/forgot-password" element={<ForgotPassword />} />
-                  <Route path="/analytics" element={<Analytics />} />
-                  <Route path="/payment-methods" element={<PaymentMethods />} />
+                  <Route path="/analytics" element={
+                    <PrivateRoute>
+                      <Analytics />
+                    </PrivateRoute>
+                  } />
+                  <Route path="/payment-methods" element={
+                    <PrivateRoute>
+                      <PaymentMethods />
+                    </PrivateRoute>
+                  } />
                   <Route path="*" element={<NotFound />} />
                 </Routes>
               </div>