src/Elfisa.Avalonia/App.axaml.cs

@@ -18,6 +18,10 @@ public partial class App : Application
 
     public override void OnFrameworkInitializationCompleted()
     {
+        RequestedThemeVariant = Elfisa.Core.SettingsStore.Current.Theme == "Dark"
+            ? global::Avalonia.Styling.ThemeVariant.Dark
+            : global::Avalonia.Styling.ThemeVariant.Light;
+
         if (ApplicationLifetime is IClassicDesktopStyleApplicationLifetime desktop)
         {
             desktop.MainWindow = new MainWindow

src/Elfisa.Avalonia/ViewModels/CartService.cs

@@ -0,0 +1,71 @@
+using System;
+using System.Collections.ObjectModel;
+using System.Linq;
+using CommunityToolkit.Mvvm.ComponentModel;
+using Elfisa.Core;
+
+namespace Elfisa.Avalonia.ViewModels;
+
+public partial class CartItem : ObservableObject
+{
+    public PriceItem Source { get; }
+    public string Name => Source.DrugName ?? "";
+    public string Supplier => Source.SupplierName ?? "";
+    public decimal Price => Source.Price;
+
+    [ObservableProperty] private decimal _qty = 1;
+    public decimal LineSum => Price * Qty;
+
+    public event Action? Changed;
+
+    public CartItem(PriceItem src) => Source = src;
+
+    partial void OnQtyChanged(decimal value)
+    {
+        OnPropertyChanged(nameof(LineSum));
+        Changed?.Invoke();
+    }
+}
+
+/// <summary>Единая корзина заказа — общая для «Прайс-листа» и «Отправить».</summary>
+public sealed class CartService
+{
+    public static CartService Instance { get; } = new();
+
+    public ObservableCollection<CartItem> Items { get; } = new();
+    public event Action? Changed;
+
+    public decimal Total => Items.Sum(c => c.LineSum);
+    public int Count => Items.Count;
+
+    public void Add(PriceItem src, decimal qty = 1)
+    {
+        if (src is null || string.IsNullOrEmpty(src.SupplierPriceId)) return;
+        var existing = Items.FirstOrDefault(c => c.Source.SupplierPriceId == src.SupplierPriceId);
+        if (existing != null) existing.Qty += qty;
+        else
+        {
+            var ci = new CartItem(src) { Qty = qty };
+            ci.Changed += Raise;
+            Items.Add(ci);
+        }
+        Raise();
+    }
+
+    public void Remove(CartItem item)
+    {
+        if (item is null) return;
+        item.Changed -= Raise;
+        Items.Remove(item);
+        Raise();
+    }
+
+    public void Clear()
+    {
+        foreach (var i in Items) i.Changed -= Raise;
+        Items.Clear();
+        Raise();
+    }
+
+    private void Raise() => Changed?.Invoke();
+}

src/Elfisa.Avalonia/ViewModels/PriceListViewModel.cs

@@ -7,24 +7,33 @@ using Elfisa.Core;
 
 namespace Elfisa.Avalonia.ViewModels;
 
-/// <summary>Прайс-лист (сводный прайс с /api/supplier-prices/summary — как в WinForms).</summary>
+/// <summary>Прайс-лист (сводный прайс) + добавление позиций в заказ (общая корзина).</summary>
 public partial class PriceListViewModel : ViewModelBase
 {
     private readonly ApiClient _api = new();
+    private readonly CartService _cart = CartService.Instance;
 
     public ObservableCollection<PriceItem> Items { get; } = new();
 
     [ObservableProperty] private string _search = "";
+    [ObservableProperty] private PriceItem? _selectedItem;
+    [ObservableProperty] private decimal _qty = 1;
     [ObservableProperty] private bool _busy;
     [ObservableProperty] private string? _status;
     [ObservableProperty] private int _total;
+    [ObservableProperty] private string _cartInfo = "";
 
     public PriceListViewModel()
     {
         _api.SetToken(Session.Current.Token);
+        _cart.Changed += UpdateCartInfo;
+        UpdateCartInfo();
         if (Session.Current.IsAuthenticated) _ = SearchAsync();
     }
 
+    private void UpdateCartInfo() =>
+        CartInfo = _cart.Count == 0 ? "Корзина пуста" : $"В заказе: {_cart.Count} поз. · {_cart.Total:N2}";
+
     [RelayCommand]
     private async Task SearchAsync()
     {
@@ -42,4 +51,13 @@ public partial class PriceListViewModel : ViewModelBase
         catch (Exception ex) { Status = ex.Message; }
         finally { Busy = false; }
     }
+
+    [RelayCommand]
+    private void AddToOrder()
+    {
+        if (SelectedItem is null) { Status = "Выберите позицию в списке."; return; }
+        var q = Qty <= 0 ? 1 : Qty;
+        _cart.Add(SelectedItem, q);
+        Status = $"Добавлено в заказ: {SelectedItem.DrugName} × {q:N0}";
+    }
 }

src/Elfisa.Avalonia/ViewModels/SendOrderViewModel.cs

@@ -1,6 +1,5 @@
 using System;
 using System.Collections.ObjectModel;
-using System.Collections.Specialized;
 using System.Linq;
 using System.Threading.Tasks;
 using CommunityToolkit.Mvvm.ComponentModel;
@@ -9,37 +8,17 @@ using Elfisa.Core;
 
 namespace Elfisa.Avalonia.ViewModels;
 
-public partial class CartItem : ObservableObject
-{
-    public PriceItem Source { get; }
-    public string Name => Source.DrugName ?? "";
-    public string Supplier => Source.SupplierName ?? "";
-    public decimal Price => Source.Price;
-
-    [ObservableProperty] private decimal _qty = 1;
-    public decimal LineSum => Price * Qty;
-
-    public event Action? Changed;
-
-    public CartItem(PriceItem src) => Source = src;
-
-    partial void OnQtyChanged(decimal value)
-    {
-        OnPropertyChanged(nameof(LineSum));
-        Changed?.Invoke();
-    }
-}
-
 /// <summary>
-/// Отправить: поиск по прайсу → корзина → создание заказа (POST /api/buyer/orders).
+/// Отправить: поиск по прайсу → корзина (общая с Прайс-листом) → создание заказа.
 /// ВНИМАНИЕ: отправка создаёт реальный заказ у поставщика.
 /// </summary>
 public partial class SendOrderViewModel : ViewModelBase
 {
     private readonly ApiClient _api = new();
+    private readonly CartService _cart = CartService.Instance;
 
     public ObservableCollection<PriceItem> Results { get; } = new();
-    public ObservableCollection<CartItem> Cart { get; } = new();
+    public ObservableCollection<CartItem> Cart => _cart.Items;
     public ObservableCollection<BuyerLocationDto> Locations { get; } = new();
 
     [ObservableProperty] private string _search = "";
@@ -53,12 +32,11 @@ public partial class SendOrderViewModel : ViewModelBase
     public SendOrderViewModel()
     {
         _api.SetToken(Session.Current.Token);
-        Cart.CollectionChanged += OnCartChanged;
+        _cart.Changed += Recalc;
+        Recalc();
         if (Session.Current.IsAuthenticated) _ = InitAsync();
     }
 
-    private void OnCartChanged(object? s, NotifyCollectionChangedEventArgs e) => Recalc();
-
     private async Task InitAsync()
     {
         try
@@ -90,33 +68,19 @@ public partial class SendOrderViewModel : ViewModelBase
     private void AddToCart()
     {
         if (SelectedResult is null) { Status = "Выберите позицию в списке слева."; return; }
-        var existing = Cart.FirstOrDefault(c => c.Source.SupplierPriceId == SelectedResult.SupplierPriceId);
+        _cart.Add(SelectedResult);
-        if (existing != null) { existing.Qty += 1; }
-        else
-        {
-            var ci = new CartItem(SelectedResult);
-            ci.Changed += Recalc;
-            Cart.Add(ci);
-        }
-        Recalc();
     }
 
     [RelayCommand]
-    private void RemoveFromCart(CartItem? item)
+    private void RemoveFromCart(CartItem? item) => _cart.Remove(item!);
-    {
-        if (item is null) return;
-        item.Changed -= Recalc;
-        Cart.Remove(item);
-        Recalc();
-    }
 
-    private void Recalc() => CartTotal = Cart.Sum(c => c.LineSum);
+    private void Recalc() => CartTotal = _cart.Total;
 
     [RelayCommand]
     private async Task SendAsync()
     {
         Status = null;
-        if (Cart.Count == 0) { Status = "Корзина пуста."; return; }
+        if (_cart.Count == 0) { Status = "Корзина пуста."; return; }
         try
         {
             Busy = true;
@@ -124,7 +88,7 @@ public partial class SendOrderViewModel : ViewModelBase
             {
                 LocationId = SelectedLocation?.BuyerLocationId,
                 Comment = string.IsNullOrWhiteSpace(Comment) ? null : Comment.Trim(),
-                Items = Cart.Select(c => new BuyerOrderItemReq
+                Items = _cart.Items.Select(c => new BuyerOrderItemReq
                 {
                     SupplierPriceId = c.Source.SupplierPriceId ?? "",
                     Qty = (double)c.Qty,
@@ -134,8 +98,7 @@ public partial class SendOrderViewModel : ViewModelBase
             };
             var resp = await _api.CreateOrderAsync(req);
             Status = $"✓ Заказ {resp.GlobalSign ?? resp.OrderId} создан: {resp.ItemsCount} поз., {resp.TotalAmount:N2}.";
-            Cart.Clear();
+            _cart.Clear();
-            Recalc();
         }
         catch (Exception ex) { Status = "Ошибка отправки: " + ex.Message; }
         finally { Busy = false; }

src/Elfisa.Avalonia/ViewModels/SettingsViewModel.cs

@@ -0,0 +1,43 @@
+using System;
+using System.Collections.ObjectModel;
+using System.Linq;
+using System.Threading.Tasks;
+using CommunityToolkit.Mvvm.ComponentModel;
+using Elfisa.Core;
+
+namespace Elfisa.Avalonia.ViewModels;
+
+public partial class SettingsViewModel : ViewModelBase
+{
+    private readonly ApiClient _api = new();
+
+    [ObservableProperty] private string _apiBaseUrl = "";
+    public string[] Themes { get; } = { "Светлая", "Тёмная" };
+    [ObservableProperty] private int _themeIndex;
+
+    public ObservableCollection<BuyerLocationDto> Locations { get; } = new();
+    [ObservableProperty] private BuyerLocationDto? _selectedLocation;
+
+    public SettingsViewModel()
+    {
+        _api.SetToken(Session.Current.Token);
+        ApiBaseUrl = SettingsStore.Current.ApiBaseUrl ?? AppConfig.DefaultApiBaseUrl;
+        ThemeIndex = SettingsStore.Current.Theme == "Dark" ? 1 : 0;
+        if (Session.Current.IsAuthenticated) _ = LoadLocationsAsync();
+    }
+
+    private async Task LoadLocationsAsync()
+    {
+        try
+        {
+            var locs = await _api.GetBuyerLocationsAsync();
+            Locations.Clear();
+            foreach (var l in locs) Locations.Add(l);
+            var savedId = SettingsStore.Current.DefaultLocationId;
+            SelectedLocation = Locations.FirstOrDefault(l => l.BuyerLocationId == savedId)
+                               ?? Locations.FirstOrDefault(l => l.IsDefault)
+                               ?? Locations.FirstOrDefault();
+        }
+        catch { /* локации не критичны для настроек */ }
+    }
+}

src/Elfisa.Avalonia/Views/PriceListView.axaml

@@ -27,8 +27,17 @@
             <TextBlock Text="{Binding Status}" Foreground="{DynamicResource AccentPressed}" FontSize="12.5"/>
         </Border>
 
+        <Border DockPanel.Dock="Bottom" Classes="card" Margin="0,10,0,0" Padding="14">
+            <StackPanel Orientation="Horizontal" Spacing="12" VerticalAlignment="Center">
+                <TextBlock Text="Кол-во" Classes="label"/>
+                <NumericUpDown Value="{Binding Qty}" Minimum="1" Maximum="100000" Increment="1" FormatString="0" Width="130"/>
+                <Button Classes="primary" Content="Добавить в заказ ▸" Command="{Binding AddToOrderCommand}"/>
+                <TextBlock Text="{Binding CartInfo}" Classes="muted" VerticalAlignment="Center" Margin="10,0,0,0"/>
+            </StackPanel>
+        </Border>
+
         <Border Classes="card" Padding="0" ClipToBounds="True">
-            <DataGrid ItemsSource="{Binding Items}" x:CompileBindings="False"
+            <DataGrid ItemsSource="{Binding Items}" SelectedItem="{Binding SelectedItem}" x:CompileBindings="False"
                       AutoGenerateColumns="False" IsReadOnly="True" HeadersVisibility="Column"
                       CanUserResizeColumns="True" CanUserSortColumns="False">
                 <DataGrid.Columns>

src/Elfisa.Avalonia/Views/SettingsWindow.axaml

@@ -0,0 +1,34 @@
+<Window xmlns="https://github.com/avaloniaui"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:vm="using:Elfisa.Avalonia.ViewModels"
+        x:Class="Elfisa.Avalonia.Views.SettingsWindow"
+        x:DataType="vm:SettingsViewModel"
+        Width="460" Height="360" CanResize="False"
+        WindowStartupLocation="CenterOwner"
+        Background="{DynamicResource Bg}"
+        Title="Настройки">
+
+    <StackPanel Margin="24" Spacing="16">
+        <TextBlock Text="Настройки" Classes="h1"/>
+
+        <StackPanel Spacing="6">
+            <TextBlock Text="Адрес сервера (API)" Classes="label"/>
+            <TextBox Text="{Binding ApiBaseUrl}" Watermark="https://24pharmdata.ru"/>
+        </StackPanel>
+
+        <StackPanel Spacing="6">
+            <TextBlock Text="Тема" Classes="label"/>
+            <ComboBox ItemsSource="{Binding Themes}" SelectedIndex="{Binding ThemeIndex}" HorizontalAlignment="Stretch"/>
+        </StackPanel>
+
+        <StackPanel Spacing="6">
+            <TextBlock Text="Грузополучатель по умолчанию" Classes="label"/>
+            <ComboBox ItemsSource="{Binding Locations}" SelectedItem="{Binding SelectedLocation}" HorizontalAlignment="Stretch"/>
+        </StackPanel>
+
+        <StackPanel Orientation="Horizontal" HorizontalAlignment="Right" Spacing="10" Margin="0,8,0,0">
+            <Button Content="Отмена" Click="OnCancel" Padding="18,9"/>
+            <Button Classes="primary" Content="Сохранить" Click="OnSave"/>
+        </StackPanel>
+    </StackPanel>
+</Window>

src/Elfisa.Avalonia/Views/SettingsWindow.axaml.cs

@@ -0,0 +1,31 @@
+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Interactivity;
+using Avalonia.Markup.Xaml;
+using Avalonia.Styling;
+using Elfisa.Avalonia.ViewModels;
+using Elfisa.Core;
+
+namespace Elfisa.Avalonia.Views;
+
+public partial class SettingsWindow : Window
+{
+    public SettingsWindow() => AvaloniaXamlLoader.Load(this);
+
+    private void OnSave(object? sender, RoutedEventArgs e)
+    {
+        if (DataContext is SettingsViewModel vm)
+        {
+            SettingsStore.Current.ApiBaseUrl = string.IsNullOrWhiteSpace(vm.ApiBaseUrl) ? null : vm.ApiBaseUrl.Trim().TrimEnd('/');
+            SettingsStore.Current.Theme = vm.ThemeIndex == 1 ? "Dark" : "Light";
+            SettingsStore.Current.DefaultLocationId = vm.SelectedLocation?.BuyerLocationId;
+            SettingsStore.Save();
+
+            if (Application.Current is { } app)
+                app.RequestedThemeVariant = vm.ThemeIndex == 1 ? ThemeVariant.Dark : ThemeVariant.Light;
+        }
+        Close();
+    }
+
+    private void OnCancel(object? sender, RoutedEventArgs e) => Close();
+}

src/Elfisa.Avalonia/Views/ShellView.axaml

@@ -44,6 +44,10 @@
                         <TextBlock Text="{Binding RoleLabel}" Foreground="{DynamicResource SidebarText}"
                                    FontSize="10.5" HorizontalAlignment="Right"/>
                     </StackPanel>
+                    <Button Content="⚙" Click="OnSettingsClick" ToolTip.Tip="Настройки"
+                            Background="Transparent" Foreground="White" BorderBrush="#55FFFFFF"
+                            BorderThickness="1" CornerRadius="8" Width="40" Height="38" Padding="0"
+                            FontSize="16" Cursor="Hand"/>
                     <Button Content="Выйти" Command="{Binding LogoutCommand}"
                             Background="Transparent" Foreground="White" BorderBrush="#55FFFFFF"
                             BorderThickness="1" CornerRadius="8" Padding="16,9" Cursor="Hand"/>

src/Elfisa.Avalonia/Views/ShellView.axaml.cs

@@ -1,9 +1,21 @@
+using Avalonia;
 using Avalonia.Controls;
+using Avalonia.Controls.ApplicationLifetimes;
+using Avalonia.Interactivity;
 using Avalonia.Markup.Xaml;
+using Elfisa.Avalonia.ViewModels;
 
 namespace Elfisa.Avalonia.Views;
 
 public partial class ShellView : UserControl
 {
     public ShellView() => AvaloniaXamlLoader.Load(this);
+
+    private async void OnSettingsClick(object? sender, RoutedEventArgs e)
+    {
+        var win = new SettingsWindow { DataContext = new SettingsViewModel() };
+        var owner = (Application.Current?.ApplicationLifetime as IClassicDesktopStyleApplicationLifetime)?.MainWindow;
+        if (owner is not null) await win.ShowDialog(owner);
+        else win.Show();
+    }
 }

src/Elfisa.Core/AppConfig.cs

@@ -17,6 +17,8 @@ public static class AppConfig
     {
         get
         {
+            var fromSettings = SettingsStore.Current.ApiBaseUrl;
+            if (!string.IsNullOrWhiteSpace(fromSettings)) return fromSettings.Trim().TrimEnd('/');
             var env = Environment.GetEnvironmentVariable(ApiEnv);
             return string.IsNullOrWhiteSpace(env) ? DefaultApiBaseUrl : env.Trim().TrimEnd('/');
         }

src/Elfisa.Core/SettingsStore.cs

@@ -0,0 +1,44 @@
+using System.Text.Json;
+
+namespace Elfisa.Core;
+
+public sealed class AppSettings
+{
+    public string? ApiBaseUrl { get; set; }
+    public string Theme { get; set; } = "Light";        // Light | Dark
+    public string? DefaultLocationId { get; set; }
+    public string? Token { get; set; }                   // сохранённая сессия
+    public string? Role { get; set; }
+    public string? Username { get; set; }
+}
+
+/// <summary>Настройки приложения в %APPDATA%\ElfisaAvalonia\settings.json.</summary>
+public static class SettingsStore
+{
+    private static readonly string Dir =
+        Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData), "ElfisaAvalonia");
+    private static readonly string File = Path.Combine(Dir, "settings.json");
+
+    public static AppSettings Current { get; private set; } = Load();
+
+    public static AppSettings Load()
+    {
+        try
+        {
+            if (System.IO.File.Exists(File))
+                return JsonSerializer.Deserialize<AppSettings>(System.IO.File.ReadAllText(File)) ?? new AppSettings();
+        }
+        catch { /* повреждённый файл — начинаем с чистых настроек */ }
+        return new AppSettings();
+    }
+
+    public static void Save()
+    {
+        try
+        {
+            Directory.CreateDirectory(Dir);
+            System.IO.File.WriteAllText(File, JsonSerializer.Serialize(Current, new JsonSerializerOptions { WriteIndented = true }));
+        }
+        catch { /* нет прав/диска — молча пропускаем */ }
+    }
+}