removed some unnecessary code and add some async guards

lib/app.dart

@@ -40,7 +40,7 @@ class _KMobileState extends State<KMobile> {
   void initState() {
     super.initState();
     loadPreferences();
-    Future.delayed(const Duration(seconds: 2), () {
+    Future.delayed(const Duration(seconds: 3), () {
       setState(() {
         showSplash = false;
       });
@@ -67,7 +67,6 @@ class _KMobileState extends State<KMobile> {
 
   @override
   Widget build(BuildContext context) {
-// Set status bar color and brightness
     SystemChrome.setSystemUIOverlayStyle(
       const SystemUiOverlayStyle(
         statusBarColor: Colors.transparent,
@@ -119,7 +118,6 @@ class AuthGate extends StatefulWidget {
 class _AuthGateState extends State<AuthGate> {
   bool _checking = true;
   bool _isLoggedIn = false;
-  bool _showWelcome = true;
   bool _hasMPin = false;
   bool _biometricEnabled = false;
   bool _biometricTried = false;
@@ -175,18 +173,7 @@ class _AuthGateState extends State<AuthGate> {
     if (_checking) {
       return const SplashScreen();
     }
-    // ✅ Step 1: Show welcome screen first, only once
-    if (_showWelcome) {
-      return WelcomeScreen(
-        onContinue: () {
-          setState(() {
-            _showWelcome = false;
-          });
-        },
-      );
-    }
 
-    // ✅ Step 2: Check login status
     if (_isLoggedIn) {
       if (_hasMPin) {
         if (_biometricEnabled) {
@@ -201,7 +188,6 @@ class _AuthGateState extends State<AuthGate> {
                 return const NavigationScaffold(); // Authenticated
               }
 
-              // ❌ Biometric failed → Show MPIN screen
               return MPinScreen(
                 mode: MPinMode.enter,
                 onCompleted: (_) {
@@ -227,7 +213,6 @@ class _AuthGateState extends State<AuthGate> {
           );
         }
       } else {
-        // No MPIN set → show MPIN set screen + biometric dialog
         return MPinScreen(
           mode: MPinMode.set,
           onCompleted: (_) async {
@@ -289,8 +274,6 @@ class _AuthGateState extends State<AuthGate> {
         );
       }
     }
-
-    // ✅ Step 3: If not logged in, show login screen
     return const LoginScreen();
   }
 }
@@ -382,29 +365,6 @@ class _NavigationScaffoldState extends State<NavigationScaffold> {
   }
 }
 
-class SplashScreen extends StatelessWidget {
-  const SplashScreen({super.key});
-
-  @override
-  Widget build(BuildContext context) {
-    return Scaffold(
-      body: Center(
-        child: Column(
-          mainAxisAlignment: MainAxisAlignment.center,
-          children: [
-            const CircularProgressIndicator(),
-            const SizedBox(height: 20),
-            Text(
-              AppLocalizations.of(context).loading,
-              style: Theme.of(context).textTheme.headlineMedium,
-            ),
-          ],
-        ),
-      ),
-    );
-  }
-}
-
 // Add this widget at the end of the file
 class BiometricPromptScreen extends StatelessWidget {
   final VoidCallback onCompleted;
@@ -466,6 +426,9 @@ class BiometricPromptScreen extends StatelessWidget {
         ],
       ),
     );
+    if (!context.mounted) {
+      return;
+    }
     if (result == true) {
       await _handleBiometric(context);
     } else {