Start adding server support

Application/Options/AccountWindow.xaml.cs

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+using ChrisKaczor.Wpf.Validation;
+using System.Linq;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Threading;
+
+namespace FeedCenter.Options;
+
+public partial class AccountWindow
+{
+    private Account _account;
+    private bool _isNew;
+    private readonly FeedCenterEntities _entities;
+
+    public AccountWindow(FeedCenterEntities entities)
+    {
+        _entities = entities;
+
+        InitializeComponent();
+    }
+
+    public bool? Display(Account account, Window owner, bool isNew)
+    {
+        _account = account;
+        _isNew = isNew;
+
+        DataContext = account;
+
+        Title = isNew ? Properties.Resources.AccountWindowAdd : Properties.Resources.AccountWindowEdit;
+
+        Owner = owner;
+
+        return ShowDialog();
+    }
+
+    private void HandleOkayButtonClick(object sender, RoutedEventArgs e)
+    {
+        var transaction = _entities.BeginTransaction();
+
+        if (!this.IsValid(OptionsTabControl))
+        {
+            transaction.Rollback();
+            return;
+        }
+
+        if (_isNew)
+        {
+            _entities.Accounts.Add(_account);
+        }
+
+        transaction.Commit();
+
+        var accountId = _account.Id;
+
+        AccountReadProgressBar.Value = 0;
+        AccountReadProgressBar.Maximum = _account.GetProgressSteps(_entities) + 1;
+
+        AccountReadProgress.Visibility = Visibility.Visible;
+        ButtonPanel.Visibility = Visibility.Collapsed;
+
+        var dispatcher = Dispatcher.CurrentDispatcher;
+
+        Task.Run(() =>
+        {
+            var entities = new FeedCenterEntities();
+            var account = entities.Accounts.First(a => a.Id == accountId);
+            var accountReadInput = new AccountReadInput(entities, null, true, () => dispatcher.Invoke(() => AccountReadProgressBar.Value++));
+            account.Read(accountReadInput);
+
+            dispatcher.Invoke(() =>
+            {
+                DialogResult = true;
+
+                Close();
+            });
+        });
+    }
+}