Add detailed mobile debugging

crossword-app/backend/src/app.js

@@ -53,7 +53,9 @@ app.use(express.json({ limit: '10mb' }));
 app.use(express.urlencoded({ extended: true, limit: '10mb' }));
 
 app.use((req, res, next) => {
-  console.log(`${new Date().toISOString()} - ${req.method} ${req.path} - User-Agent: ${req.get('User-Agent')?.substring(0, 50) || 'unknown'}`);
+  const userAgent = req.get('User-Agent') || 'unknown';
+  console.log(`${new Date().toISOString()} - ${req.method} ${req.path} - User-Agent: ${userAgent.substring(0, 100)}`);
+  console.log(`Headers:`, JSON.stringify(req.headers, null, 2));
   next();
 });
 
@@ -105,7 +107,12 @@ if (process.env.NODE_ENV === 'production') {
   
   // Handle React Router routes - serve index.html for non-API routes
   app.get('*', (req, res) => {
-    console.log(`Serving index.html for: ${req.path}`);
+    const userAgent = req.get('User-Agent') || '';
+    const isMobile = /iPhone|iPad|Android|Mobile/i.test(userAgent);
+    console.log(`Serving index.html for: ${req.path}, Mobile: ${isMobile}, UA: ${userAgent.substring(0, 50)}`);
+    
+    // Ensure we're sending the right content type
+    res.setHeader('Content-Type', 'text/html; charset=utf-8');
     res.sendFile(path.join(staticPath, 'index.html'));
   });
 } else {