Fixed warning context and hard code strings in notificationModelView and some widgets

lib/view_models/notification_view_model.dart

@@ -3,6 +3,7 @@ import 'package:tm_app/core/utils/app_toast.dart';
 import 'package:tm_app/core/utils/result.dart';
 import 'package:tm_app/data/repositories/notification_repository.dart';
 import 'package:tm_app/data/services/model/notification__response/notification_response_model.dart';
+import 'package:tm_app/views/notification/strings/notification_strings.dart';
 
 class NotificationViewModel with ChangeNotifier {
   final NotificationsRepository _repository;
@@ -98,11 +99,15 @@ class NotificationViewModel with ChangeNotifier {
 
     final result = await _repository.markAllAsRead();
 
+    if (!context.mounted) {
+      return;
+    }
+
     switch (result) {
       case Ok<Map<String, dynamic>>():
         final response = result.value;
         final success = response['success'] as bool? ?? false;
-        final message = response['message'] as String? ?? 'Unknown response';
+        final message = response['message'] as String? ?? NotificationStrings.unknownResponse;
 
         if (success) {
           if (_notificationResponseModel?.data?.notifications != null) {
@@ -118,21 +123,28 @@ class NotificationViewModel with ChangeNotifier {
             );
           }
 
-          await getNotifications(page: currentPage, );
+          await getNotifications(page: currentPage);
           await getUnreadNotifications();
 
-
-          // toast success
-          AppToast.success(context, 'All notifications marked as read.');
+          if (context.mounted) {
+            AppToast.success(
+              context,
+              NotificationStrings.allNotificationMarkedAsRead,
+            );
+          }
         } else {
           _errorMessage = message;
-          AppToast.error(context, message);
+          if (context.mounted) {
+            AppToast.error(context, message);
+          }
         }
         break;
 
       case Error<Map<String, dynamic>>():
         _errorMessage = result.error.toString();
-        AppToast.error(context, _errorMessage!);
+        if (context.mounted) {
+          AppToast.error(context, _errorMessage!);
+        }
         break;
     }
 
@@ -146,15 +158,15 @@ class NotificationViewModel with ChangeNotifier {
     final difference = now.difference(createdAt);
 
     if (difference.inMinutes < 1) {
-      return 'Now';
+      return NotificationStrings.now;
     } else if (difference.inMinutes < 60) {
-      return '${difference.inMinutes} Min ';
+      return '${difference.inMinutes} ${NotificationStrings.min} ';
     } else if (difference.inHours < 24) {
-      return '${difference.inHours} Hour ';
+      return '${difference.inHours} ${NotificationStrings.hour} ';
     } else if (difference.inDays == 1) {
-      return 'Yesterday';
+      return NotificationStrings.yesterday;
     } else {
-      return '${difference.inDays} days ago';
+      return '${difference.inDays} ${NotificationStrings.daysAgo}';
     }
   }