resolved many context usage across async gaps warnings

also removed some unused code blocks

lib/app.dart

@@ -82,7 +82,6 @@ class _KMobileState extends State<KMobile> {
       ],
       child: BlocBuilder<ThemeCubit, ThemeState>(
         builder: (context, themeState) {
-          print('global theme state changed');
           return MaterialApp(
             debugShowCheckedModeBanner: false,
             locale: _locale ?? const Locale('en'),
@@ -153,9 +152,13 @@ class _AuthGateState extends State<AuthGate> {
     final localAuth = LocalAuthentication();
     final canCheck = await localAuth.canCheckBiometrics;
     if (!canCheck) return false;
+    String localizedReason = "";
+    if (mounted) {
+      localizedReason = AppLocalizations.of(context).authenticateToAccess;
+    }
     try {
       final didAuth = await localAuth.authenticate(
-        localizedReason: AppLocalizations.of(context).authenticateToAccess,
+        localizedReason: localizedReason,
         options: const AuthenticationOptions(
           stickyAuth: true,
           biometricOnly: true,
@@ -255,11 +258,14 @@ class _AuthGateState extends State<AuthGate> {
             if (optIn == true) {
               final canCheck = await localAuth.canCheckBiometrics;
               bool didAuth = false;
+              String authEnable = "";
+              if (context.mounted) {
+                authEnable = AppLocalizations.of(context).authenticateToEnable;
+              }
 
               if (canCheck) {
                 didAuth = await localAuth.authenticate(
-                  localizedReason:
+                  localizedReason: authEnable,
-                      AppLocalizations.of(context).authenticateToEnable,
                   options: const AuthenticationOptions(
                     stickyAuth: true,
                     biometricOnly: true,
@@ -272,11 +278,13 @@ class _AuthGateState extends State<AuthGate> {
               }
             }
 
+            if (context.mounted) {
               Navigator.of(context).pushReplacement(
                 MaterialPageRoute(
                   builder: (_) => const NavigationScaffold(),
                 ),
               );
+            }
           },
         );
       }
@@ -304,17 +312,8 @@ class _NavigationScaffoldState extends State<NavigationScaffold> {
     const ServiceScreen(),
   ];
 
-  void _onItemTapped(int index) {
-    setState(() {
-      _selectedIndex = index;
-    });
-    _pageController.jumpToPage(index);
-  }
-
   @override
   Widget build(BuildContext context) {
-    print(
-        "--- NavigationScaffold is rebuilding with theme color: ${Theme.of(context).primaryColor}");
     return PopScope(
       canPop: false,
       onPopInvokedWithResult: (didPop, result) async {
@@ -418,8 +417,12 @@ class BiometricPromptScreen extends StatelessWidget {
       onCompleted();
       return;
     }
+    String localizedReason = "";
+    if (context.mounted) {
+      localizedReason = AppLocalizations.of(context).enableFingerprintQuick;
+    }
     final didAuth = await localAuth.authenticate(
-      localizedReason: AppLocalizations.of(context).enableFingerprintQuick,
+      localizedReason: localizedReason,
       options: const AuthenticationOptions(
         stickyAuth: true,
         biometricOnly: true,