Optimized the startup by removing redundant init

  Changes Made:

  1. Removed duplicate key initialization:
    - Removed _initializeKeys() method from MainScreenState
    - Removed the call to initialize keys in initState() since keys are already initialized in
  main()
  2. Removed duplicate election loading:
    - Removed loadElections() call from ElectionsScreen.initState()
    - Elections are already loaded in MainScreenState._loadElectionsOnStartup()

  Expected Results:

  After these optimizations, the app startup logs should no longer show:
  - Duplicate "✅ Existing mnemonic validated successfully" messages
  - Duplicate "🚀 Starting election loading process..." messages
  - Duplicate "🔌 Connecting to Nostr service..." attempts
  - "🔗 Connection already in progress, waiting..." warnings

  The app will now:
  - Initialize keys only once during main()
  - Load elections only once in MainScreenState
  - Connect to Nostr service without conflicts
  - Start faster with cleaner logs
  - Maintain all existing functionality

  The optimizations eliminate redundant work while preserving the exact same user experience,
  just with better performance and cleaner debug output.

Author: grunch

lib/main.dart

@@ -116,8 +116,7 @@ class _MainScreenState extends State<MainScreen> {
   @override
   void initState() {
     super.initState();
-    // Initialize Nostr keys on first launch
-    _initializeKeys();
+    // Keys are already initialized in main(), no need to do it again
     // Start global election results subscription
     _startGlobalElectionResultsSubscription();
     // Load elections immediately to have metadata available
@@ -138,13 +137,6 @@ class _MainScreenState extends State<MainScreen> {
     debugPrint('✅ MainScreenState: Disposal completed');
   }
 
-  Future<void> _initializeKeys() async {
-    try {
-      await NostrKeyManager.initializeKeysIfNeeded();
-    } catch (e) {
-      debugPrint('Error initializing Nostr keys: $e');
-    }
-  }
 
   /// Load elections on app startup to ensure metadata is available for results
   void _loadElectionsOnStartup() {

lib/screens/elections_screen.dart

@@ -26,9 +26,7 @@ class _ElectionsScreenState extends State<ElectionsScreen> {
   @override
   void initState() {
     super.initState();
-    WidgetsBinding.instance.addPostFrameCallback((_) {
-      context.read<ElectionProvider>().loadElections();
-    });
+    // Elections are already loaded in MainScreenState, no need to load again
   }
 
   @override