chore: Show close icon for device verification warning

lib/config/themes.dart

@@ -125,6 +125,7 @@ abstract class FluffyThemes {
       ),
       snackBarTheme: const SnackBarThemeData(
         behavior: SnackBarBehavior.floating,
+        width: FluffyThemes.columnWidth * 1.5,
       ),
       elevatedButtonTheme: ElevatedButtonThemeData(
         style: ElevatedButton.styleFrom(

lib/pages/chat_list/chat_list.dart

@@ -773,7 +773,9 @@ class ChatListController extends State<ChatList>
       controller = ScaffoldMessenger.of(context).showSnackBar(
         SnackBar(
           duration: const Duration(seconds: 15),
+          showCloseIcon: true,
           backgroundColor: theme.colorScheme.errorContainer,
+          closeIconColor: theme.colorScheme.onErrorContainer,
           content: Text(
             L10n.of(context).oneOfYourDevicesIsNotVerified,
             style: TextStyle(