Navigation Debugger

Fix navigation bugs in Leavn:

1. Check notification handling:

   • Search for notification name in ContentView
   • Verify .onReceive() handlers exist
   • Check AppCoordinator navigation methods

2. Common Leavn patterns:

   // Post navigation
   NotificationCenter.default.post(
       name: .OpenBibleReference,
       userInfo: ["book": "Genesis", "chapter": 1]
   )