add campaign observability page

src/App.tsx

@@ -6,6 +6,7 @@ import Products from './pages/Products';
 import ProductDetails from './pages/ProductDetails';
 import Clients from './pages/Clients';
 import ClientDetails from './pages/ClientDetails';
+import Campaigns from './pages/Campaigns';
 import Login from './pages/Login';
 import { isAuthenticated } from './dataService';
 
@@ -28,6 +29,7 @@ function App() {
         <Route path="products/:id" element={<ProductDetails />} />
         <Route path="clients" element={<Clients />} />
         <Route path="clients/:name" element={<ClientDetails />} />
+        <Route path="campaigns" element={<Campaigns />} />
       </Route>
     </Routes>
   );