Fix Safari/iPhone performance issues - remove 300ms click delay

- Added touch-action: manipulation CSS to eliminate 300ms tap delay
- Optimized service worker to skip cross-origin requests
- Updated viewport settings to prevent iOS delays
- Added format-detection meta tag
- Enabled Next.js performance optimizations
- Created comprehensive performance fix documentation

public/sw.js

@@ -60,6 +60,11 @@ self.addEventListener('fetch', (event) => {
   if (!url.protocol.startsWith('http')) {
     return;
   }
+  
+  // Skip cross-origin requests for performance
+  if (url.origin !== self.location.origin) {
+    return;
+  }
 
   // Handle authentication-related requests
   if (isAuthRequest(url)) {