fixed server file

server.js

@@ -198,8 +198,8 @@ app.post('/api/modify-code', async (req, res) => {
   }
 });
 
-// Serve React app for all other routes
-app.get('*', (req, res) => {
+// Serve React app for all other routes (use RegExp to avoid path-to-regexp wildcard parsing issues)
+app.get(/.*/, (req, res) => {
   res.sendFile(path.join(__dirname, 'dist', 'index.html'));
 });