fixed some async gaps warnings

lib/features/dashboard/screens/dashboard_screen.dart

@@ -1,4 +1,3 @@
-// ignore_for_file: use_build_context_synchronously
 import 'dart:developer';
 import 'package:flutter/material.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
@@ -82,8 +81,11 @@ class _DashboardScreenState extends State<DashboardScreen> {
       // Call your AuthCubit or repository to refresh user/accounts data
       await context.read<AuthCubit>().refreshUserData();
     } catch (e) {
+      if (!context.mounted) {
+        return;
+      }
       ScaffoldMessenger.of(context).showSnackBar(
-        /*const*/ SnackBar(
+        SnackBar(
           content: Text(AppLocalizations.of(context).failedToRefresh),
         ),
       );
@@ -168,6 +170,7 @@ class _DashboardScreenState extends State<DashboardScreen> {
             onPressed: () async {
               final auth = LocalAuthentication();
               final canCheck = await auth.canCheckBiometrics;
+              if (!mounted) return;
               bool ok = false;
               if (canCheck) {
                 ok = await auth.authenticate(
@@ -178,6 +181,7 @@ class _DashboardScreenState extends State<DashboardScreen> {
                 await storage.write('biometric_enabled', 'true');
               }
               await storage.write('biometric_prompt_shown', 'true');
+              if (!mounted) return;
               Navigator.of(context).pop();
             },
             child: Text(AppLocalizations.of(context).enable),