Add graceful Firebase error handling

🐛 Fix: Handle Firebase initialization failures gracefully
- Wrapped Firebase.initializeApp() in try-catch
- App now works even if Firebase isn't configured
- Added helpful error messages pointing to FIREBASE_SETUP.md
- Household creation shows clear error if Firebase fails

⚠️ User Experience:
- If Firebase not configured: Shows error message
- Error message guides user to setup instructions
- App doesn't crash, continues with local-only mode

✅ Testing:
- APK builds successfully (63.3MB)
- App runs without Firebase configuration
- Error messages are user-friendly

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

lib/features/settings/screens/household_screen.dart

@@ -84,6 +84,7 @@ class _HouseholdScreenState extends State<HouseholdScreen> {
     );
 
     if (result != null && result.isNotEmpty) {
+      try {
         // Create household in Firebase
         final household = await _firebaseService.createHousehold(result, _settings!.userName!);
 
@@ -104,6 +105,17 @@ class _HouseholdScreenState extends State<HouseholdScreen> {
             ),
           );
         }
+      } catch (e) {
+        if (mounted) {
+          ScaffoldMessenger.of(context).showSnackBar(
+            SnackBar(
+              content: Text('Error creating household: ${e.toString().contains('firebase') ? 'Firebase not configured. See FIREBASE_SETUP.md' : e.toString()}'),
+              backgroundColor: AppColors.error,
+              duration: const Duration(seconds: 5),
+            ),
+          );
+        }
+      }
     }
   }
 

lib/main.dart

@@ -8,8 +8,15 @@ import 'features/home/screens/home_screen.dart';
 void main() async {
   WidgetsFlutterBinding.ensureInitialized();
 
-  // Initialize Firebase
+  // Initialize Firebase (gracefully handle if not configured)
+  try {
     await Firebase.initializeApp();
+    print('✅ Firebase initialized successfully');
+  } catch (e) {
+    print('⚠️ Firebase initialization failed: $e');
+    print('Household sharing will not work without Firebase configuration.');
+    print('See FIREBASE_SETUP.md for setup instructions.');
+  }
 
   // Initialize Hive database
   await HiveDatabase.init();