Update server.js

server.js

@@ -215,7 +215,9 @@ app.get(`${CITI_BASE}/accounts/:accountId/transactions`, (req, res) => {
 app.use(express.static(path.join(__dirname, 'dist')));
 
 // SPA Fallback: Redirect all non-API requests to index.html
-app.get('*', (req, res) => {
+// In Express 5, the unnamed wildcard '*' is no longer supported. 
+// Using '/*' ensures all sub-routes are captured for the frontend router.
+app.get('/*', (req, res) => {
   if (req.path.startsWith('/api')) {
     return res.status(404).json({ error: 'API endpoint not found' });
   }