AI action panel improvements.

Directory.Packages.props

@@ -33,7 +33,7 @@
     <PackageVersion Include="Microsoft.Identity.Client.Extensions.Msal" Version="4.82.1" />
     <PackageVersion Include="Microsoft.NETCore.UniversalWindowsPlatform" Version="6.2.14" />
     <PackageVersion Include="Microsoft.Xaml.Behaviors.WinUI.Managed" Version="3.0.1" />
-    <PackageVersion Include="Wino.Mail.Contracts" Version="1.0.14" />
+    <PackageVersion Include="Wino.Mail.Contracts" Version="1.0.15" />
     <PackageVersion Include="MimeKit" Version="4.15.1" />
     <PackageVersion Include="morelinq" Version="4.4.0" />
     <PackageVersion Include="Nito.AsyncEx" Version="5.1.2" />

Wino.Core.Domain/Interfaces/IPreferencesService.cs

@@ -67,6 +67,21 @@ public interface IPreferencesService : INotifyPropertyChanged
     /// </summary>
     bool IsWinoAccountButtonHidden { get; set; }
 
+    /// <summary>
+    /// Setting: Default target language code used for AI translation actions.
+    /// </summary>
+    string AiDefaultTranslationLanguageCode { get; set; }
+
+    /// <summary>
+    /// Setting: Preferred target language code for AI summarize actions.
+    /// </summary>
+    string AiSummarizeLanguageCode { get; set; }
+
+    /// <summary>
+    /// Setting: Preferred folder path used when saving AI summaries.
+    /// </summary>
+    string AiSummarySavePath { get; set; }
+
     /// <summary>
     /// Serializes the current syncable preferences snapshot.
     /// </summary>

Wino.Core.Domain/Interfaces/IWinoAccountApiClient.cs

@@ -19,7 +19,7 @@ public interface IWinoAccountApiClient
     Task<ApiEnvelope<JsonElement>> LogoutAsync(string refreshToken, CancellationToken cancellationToken = default);
     Task<ApiEnvelope<AuthUserDto>> GetCurrentUserAsync(CancellationToken cancellationToken = default);
     Task<ApiEnvelope<AiStatusResultDto>> GetAiStatusAsync(CancellationToken cancellationToken = default);
-    Task<ApiEnvelope<AiTextResultDto>> SummarizeAsync(string html, CancellationToken cancellationToken = default);
+    Task<ApiEnvelope<AiTextResultDto>> SummarizeAsync(string html, string targetLanguage, CancellationToken cancellationToken = default);
     Task<ApiEnvelope<AiTextResultDto>> TranslateAsync(string html, string targetLanguage, CancellationToken cancellationToken = default);
     Task<ApiEnvelope<AiTextResultDto>> RewriteAsync(string html, string mode, CancellationToken cancellationToken = default);
     Task<ApiEnvelope<WinoStoreCollectionsIdTicketInfo>> CreateCollectionsIdTicketAsync(CancellationToken cancellationToken = default);

Wino.Core.Domain/Interfaces/IWinoAccountProfileService.cs

@@ -24,7 +24,7 @@ public interface IWinoAccountProfileService
     Task<bool> HasActiveAccountAsync();
     Task<ApiEnvelope<AuthUserDto>> GetCurrentUserAsync(CancellationToken cancellationToken = default);
     Task<ApiEnvelope<AiStatusResultDto>> GetAiStatusAsync(CancellationToken cancellationToken = default);
-    Task<ApiEnvelope<AiTextResultDto>> SummarizeAsync(string html, CancellationToken cancellationToken = default);
+    Task<ApiEnvelope<AiTextResultDto>> SummarizeAsync(string html, string targetLanguage, CancellationToken cancellationToken = default);
     Task<ApiEnvelope<AiTextResultDto>> TranslateAsync(string html, string targetLanguage, CancellationToken cancellationToken = default);
     Task<ApiEnvelope<AiTextResultDto>> RewriteAsync(string html, string mode, CancellationToken cancellationToken = default);
     Task<ApiEnvelope<JsonElement>> SyncStoreEntitlementsAsync(CancellationToken cancellationToken = default);

Wino.Core.Domain/Translations/en_US/resources.json

@@ -724,6 +724,16 @@
     "SettingsAppPreferences_HideWinoAccountButton_Description": "Hide the title bar profile button that opens the Wino account flyout.",
     "SettingsAppPreferences_StoreUpdateNotifications_Title": "Store update notifications",
     "SettingsAppPreferences_StoreUpdateNotifications_Description": "Show notifications and footer actions when a Microsoft Store update is available.",
+    "SettingsAppPreferences_AiActions_Title": "AI actions",
+    "SettingsAppPreferences_AiActions_Description": "Choose default AI languages and where summaries should be saved.",
+    "SettingsAppPreferences_AiDefaultTranslationLanguage_Title": "Default translation language",
+    "SettingsAppPreferences_AiDefaultTranslationLanguage_Description": "Pick the default target language used by AI translate actions.",
+    "SettingsAppPreferences_AiSummarizeLanguage_Title": "Summarize language",
+    "SettingsAppPreferences_AiSummarizeLanguage_Description": "Choose the preferred summarize language for future AI summary output.",
+    "SettingsAppPreferences_AiSummarySavePath_Title": "Default summary save path",
+    "SettingsAppPreferences_AiSummarySavePath_Description": "Choose the folder Wino should use by default when saving AI summaries.",
+    "SettingsAppPreferences_AiSummarySavePath_Placeholder": "Use the system default save location",
+    "SettingsAppPreferences_AiSummarySavePath_InvalidHint": "This folder does not exist. The default save location will be used for summaries.",
     "SettingsAutoSelectNextItem_Description": "Select the next item after you delete or move a mail.",
     "SettingsAutoSelectNextItem_Title": "Auto select next item",
     "SettingsAvailableThemes_Description": "Select a theme from Wino's own collection for your taste or apply your own themes.",
@@ -1071,7 +1081,7 @@
     "AiActions_SignedOutDescription": "Translate, rewrite, and summarize emails with AI after signing in to your Wino Account and activating the AI Pack add-on.",
     "AiActions_NoPackTitle": "AI Pack required",
     "AiActions_NoPackDescription": "You're signed in, but AI Pack is not active yet. Purchase it to use Wino's AI translation, rewrite, and summarize tools.",
-    "AiActions_UsageSummary": "{0} of {1} requests used this month.",
+    "AiActions_UsageSummary": "{0} of {1} credits used this month.",
     "Composer_AiRewritePolite": "Make it polite",
     "Composer_AiRewritePoliteDescription": "Softens the wording while keeping the same intent.",
     "Composer_AiRewriteAngry": "Make it angry",
@@ -1243,7 +1253,7 @@
     "WinoAccount_Management_AiPackPromoTitle": "Unlock AI Pack",
     "WinoAccount_Management_AiPackPromoDescription": "Supercharge your email workflow with AI-powered tools. Translate messages into 50+ languages, rewrite for clarity and tone, and get instant summaries of long threads.",
     "WinoAccount_Management_AiPackPromoPrice": "$4.99 / mo",
-    "WinoAccount_Management_AiPackPromoRequests": "1,000 requests",
+    "WinoAccount_Management_AiPackPromoRequests": "1,000 credits",
     "WinoAccount_Management_AiPackGetButton": "Get AI Pack",
     "WinoAddOn_AI_PACK_Name": "Wino AI Pack",
     "WinoAddOn_AI_PACK_Description": "AI-powered tools for translate, rewrite, and summarize actions in Wino Mail.",
@@ -1256,7 +1266,7 @@
     "WinoAccount_Management_StoreSyncFailed": "Your purchase finished, but Wino could not refresh your account benefits yet. Please try again in a moment.",
     "WinoAccount_Management_AiPackSubscriptionActive": "Your subscription is active",
     "WinoAccount_Management_AiPackRenews": "Renews {0:d}",
-    "WinoAccount_Management_AiPackRequestsUsed": "Requests used this month",
+    "WinoAccount_Management_AiPackRequestsUsed": "Credits used this month",
     "WinoAccount_Management_AiPackResets": "Resets {0:d}",
     "WinoAccount_Management_AiPackUsageLoadFailed": "We had issues loading your AI usage balance.",
     "WinoAccount_Management_AiPackFeatureTranslate": "Translate",

Wino.Mail.ViewModels/AppPreferencesPageViewModel.cs

@@ -1,10 +1,12 @@
 using System.Collections.Generic;
+using System.IO;
 using System.Threading.Tasks;
 using CommunityToolkit.Mvvm.ComponentModel;
 using CommunityToolkit.Mvvm.Input;
 using Wino.Core.Domain;
 using Wino.Core.Domain.Enums;
 using Wino.Core.Domain.Interfaces;
+using Wino.Core.Domain.Models.Ai;
 using Wino.Core.Domain.Models.Navigation;
 using Wino.Core.Domain.Models.Translations;
 
@@ -16,12 +18,14 @@ public partial class AppPreferencesPageViewModel : MailBaseViewModel
         IMailDialogService dialogService,
         IPreferencesService preferencesService,
         IStartupBehaviorService startupBehaviorService,
-        ITranslationService translationService)
+        ITranslationService translationService,
+        IAiActionOptionsService aiActionOptionsService)
     {
         _dialogService = dialogService;
         PreferencesService = preferencesService;
         _startupBehaviorService = startupBehaviorService;
         _translationService = translationService;
+        _aiActionOptionsService = aiActionOptionsService;
 
         SearchModes =
         [
@@ -40,6 +44,7 @@ public partial class AppPreferencesPageViewModel : MailBaseViewModel
         SelectedDefaultSearchMode = SearchModes[(int)PreferencesService.DefaultSearchMode];
         SelectedDefaultApplicationMode = ApplicationModes[(int)PreferencesService.DefaultApplicationMode];
         EmailSyncIntervalMinutes = PreferencesService.EmailSyncIntervalMinutes;
+        SummarySavePath = PreferencesService.AiSummarySavePath;
     }
 
     public IPreferencesService PreferencesService { get; }
@@ -56,6 +61,21 @@ public partial class AppPreferencesPageViewModel : MailBaseViewModel
     [ObservableProperty]
     public partial AppLanguageModel SelectedLanguage { get; set; }
 
+    [ObservableProperty]
+    public partial List<AiTranslateLanguageOption> AvailableAiLanguages { get; set; } = [];
+
+    [ObservableProperty]
+    public partial AiTranslateLanguageOption SelectedDefaultTranslationLanguage { get; set; }
+
+    [ObservableProperty]
+    public partial AiTranslateLanguageOption SelectedSummarizeLanguage { get; set; }
+
+    [ObservableProperty]
+    public partial string SummarySavePath { get; set; } = string.Empty;
+
+    [ObservableProperty]
+    public partial bool HasInvalidSummarySavePath { get; set; }
+
     [ObservableProperty]
     [NotifyPropertyChangedFor(nameof(IsStartupBehaviorDisabled))]
     [NotifyPropertyChangedFor(nameof(IsStartupBehaviorEnabled))]
@@ -64,7 +84,9 @@ public partial class AppPreferencesPageViewModel : MailBaseViewModel
     private readonly IMailDialogService _dialogService;
     private readonly IStartupBehaviorService _startupBehaviorService;
     private readonly ITranslationService _translationService;
+    private readonly IAiActionOptionsService _aiActionOptionsService;
     private bool _isLanguageInitialized;
+    private bool _isAiPreferencesInitialized;
     private int _emailSyncIntervalMinutes;
     private string _selectedDefaultSearchMode;
     private string _selectedDefaultApplicationMode;
@@ -110,6 +132,31 @@ public partial class AppPreferencesPageViewModel : MailBaseViewModel
         _ = _translationService.InitializeLanguageAsync(value.Language);
     }
 
+    partial void OnSelectedDefaultTranslationLanguageChanged(AiTranslateLanguageOption value)
+    {
+        if (!_isAiPreferencesInitialized || value == null)
+            return;
+
+        PreferencesService.AiDefaultTranslationLanguageCode = value.Code;
+    }
+
+    partial void OnSelectedSummarizeLanguageChanged(AiTranslateLanguageOption value)
+    {
+        if (!_isAiPreferencesInitialized || value == null)
+            return;
+
+        PreferencesService.AiSummarizeLanguageCode = value.Code;
+    }
+
+    partial void OnSummarySavePathChanged(string value)
+    {
+        if (!_isAiPreferencesInitialized)
+            return;
+
+        PreferencesService.AiSummarySavePath = value ?? string.Empty;
+        RefreshSummarySavePathState();
+    }
+
     [RelayCommand]
     private async Task ToggleStartupBehaviorAsync()
     {
@@ -157,15 +204,56 @@ public partial class AppPreferencesPageViewModel : MailBaseViewModel
         }
     }
 
+    [RelayCommand]
+    private async Task BrowseSummarySavePathAsync()
+    {
+        var pickedPath = await _dialogService.PickWindowsFolderAsync();
+        if (string.IsNullOrWhiteSpace(pickedPath))
+            return;
+
+        await ExecuteUIThread(() => SummarySavePath = pickedPath);
+    }
+
     public override async void OnNavigatedTo(NavigationMode mode, object parameters)
     {
         base.OnNavigatedTo(mode, parameters);
 
-        AvailableLanguages = _translationService.GetAvailableLanguages();
+        var availableLanguages = _translationService.GetAvailableLanguages();
-        SelectedLanguage = AvailableLanguages.Find(language => language.Language == PreferencesService.CurrentLanguage)
+        var availableAiLanguages = new List<AiTranslateLanguageOption>(_aiActionOptionsService.GetTranslateLanguageOptions());
-                           ?? (AvailableLanguages.Count > 0 ? AvailableLanguages[0] : null);
+        var startupBehaviorResult = await _startupBehaviorService.GetCurrentStartupBehaviorAsync();
-        _isLanguageInitialized = true;
 
-        StartupBehaviorResult = await _startupBehaviorService.GetCurrentStartupBehaviorAsync();
+        await ExecuteUIThread(() =>
+        {
+            AvailableLanguages = availableLanguages;
+            SelectedLanguage = AvailableLanguages.Find(language => language.Language == PreferencesService.CurrentLanguage)
+                               ?? (AvailableLanguages.Count > 0 ? AvailableLanguages[0] : null);
+            _isLanguageInitialized = true;
+
+            AvailableAiLanguages = availableAiLanguages;
+            SelectedDefaultTranslationLanguage = FindAiLanguageOption(PreferencesService.AiDefaultTranslationLanguageCode)
+                                                 ?? FindAiLanguageOption("en-US")
+                                                 ?? (AvailableAiLanguages.Count > 0 ? AvailableAiLanguages[0] : null);
+            SelectedSummarizeLanguage = FindAiLanguageOption(PreferencesService.AiSummarizeLanguageCode)
+                                        ?? FindAiLanguageOption("en-US")
+                                        ?? (AvailableAiLanguages.Count > 0 ? AvailableAiLanguages[0] : null);
+            SummarySavePath = PreferencesService.AiSummarySavePath;
+            RefreshSummarySavePathState();
+            _isAiPreferencesInitialized = true;
+
+            StartupBehaviorResult = startupBehaviorResult;
+        });
+    }
+
+    private AiTranslateLanguageOption FindAiLanguageOption(string languageCode)
+    {
+        if (string.IsNullOrWhiteSpace(languageCode))
+            return null;
+
+        return AvailableAiLanguages.Find(option => option.Code == languageCode);
+    }
+
+    private void RefreshSummarySavePathState()
+    {
+        HasInvalidSummarySavePath = !string.IsNullOrWhiteSpace(SummarySavePath) && !Directory.Exists(SummarySavePath);
     }
 }

Wino.Mail.WinUI/Controls/AiActionsPanel.xaml

@@ -143,71 +143,50 @@
                         Style="{StaticResource AccentButtonStyle}" />
                 </StackPanel>
 
-                <StackPanel
+                <Grid
                     x:Name="ReadyPanel"
-                    Spacing="8"
+                    ColumnSpacing="12"
                     Visibility="Collapsed">
-                    <!--  Row 1: Action tabs + usage  -->
+                    <Grid.ColumnDefinitions>
-                    <Grid ColumnSpacing="12">
+                        <ColumnDefinition Width="Auto" />
-                        <Grid.ColumnDefinitions>
+                        <ColumnDefinition Width="*" />
-                            <ColumnDefinition Width="Auto" />
+                        <ColumnDefinition Width="Auto" />
-                            <ColumnDefinition Width="*" />
+                    </Grid.ColumnDefinitions>
-                            <ColumnDefinition Width="Auto" />
+                    <!--  Column 1: Action tabs  -->
-                        </Grid.ColumnDefinitions>
+                    <controls:Segmented
+                        x:Name="ActionSelector"
+                        Height="30"
+                        VerticalAlignment="Center"
+                        SelectionChanged="ActionSelector_SelectionChanged"
+                        Style="{StaticResource ButtonSegmentedStyle}">
+                        <controls:SegmentedItem
+                            x:Name="TranslateSegment"
+                            Padding="12,6"
+                            Content="{x:Bind domain:Translator.WinoAccount_Management_AiPackFeatureTranslate, Mode=OneWay}">
+                            <controls:SegmentedItem.Icon>
+                                <SymbolIcon Symbol="Switch" />
+                            </controls:SegmentedItem.Icon>
+                        </controls:SegmentedItem>
+                        <controls:SegmentedItem
+                            x:Name="RewriteSegment"
+                            Padding="12,6"
+                            Content="{x:Bind domain:Translator.WinoAccount_Management_AiPackFeatureRewrite, Mode=OneWay}">
+                            <controls:SegmentedItem.Icon>
+                                <SymbolIcon Symbol="Edit" />
+                            </controls:SegmentedItem.Icon>
+                        </controls:SegmentedItem>
+                        <controls:SegmentedItem
+                            x:Name="SummarizeSegment"
+                            Padding="12,6"
+                            Content="{x:Bind domain:Translator.WinoAccount_Management_AiPackFeatureSummarize, Mode=OneWay}">
+                            <controls:SegmentedItem.Icon>
+                                <SymbolIcon Symbol="Bullets" />
+                            </controls:SegmentedItem.Icon>
+                        </controls:SegmentedItem>
+                    </controls:Segmented>
 
-                        <controls:Segmented
+                    <!--  Column 2: Action-specific options  -->
-                            x:Name="ActionSelector"
+                    <Grid Grid.Column="1" ColumnSpacing="8">
-                            Height="30"
-                            VerticalAlignment="Center"
-                            SelectionChanged="ActionSelector_SelectionChanged"
-                            Style="{StaticResource ButtonSegmentedStyle}">
-                            <controls:SegmentedItem
-                                x:Name="TranslateSegment"
-                                Padding="12,6"
-                                Content="{x:Bind domain:Translator.WinoAccount_Management_AiPackFeatureTranslate, Mode=OneWay}">
-                                <controls:SegmentedItem.Icon>
-                                    <SymbolIcon Symbol="Switch" />
-                                </controls:SegmentedItem.Icon>
-                            </controls:SegmentedItem>
-                            <controls:SegmentedItem
-                                x:Name="RewriteSegment"
-                                Padding="12,6"
-                                Content="{x:Bind domain:Translator.WinoAccount_Management_AiPackFeatureRewrite, Mode=OneWay}">
-                                <controls:SegmentedItem.Icon>
-                                    <SymbolIcon Symbol="Edit" />
-                                </controls:SegmentedItem.Icon>
-                            </controls:SegmentedItem>
-                            <controls:SegmentedItem
-                                x:Name="SummarizeSegment"
-                                Padding="12,6"
-                                Content="{x:Bind domain:Translator.WinoAccount_Management_AiPackFeatureSummarize, Mode=OneWay}">
-                                <controls:SegmentedItem.Icon>
-                                    <SymbolIcon Symbol="Bullets" />
-                                </controls:SegmentedItem.Icon>
-                            </controls:SegmentedItem>
-                        </controls:Segmented>
-
-                        <StackPanel
-                            Grid.Column="2"
-                            VerticalAlignment="Center"
-                            Orientation="Horizontal"
-                            Spacing="8">
-                            <ProgressBar
-                                x:Name="UsageProgressBar"
-                                Width="100"
-                                VerticalAlignment="Center"
-                                Maximum="1000"
-                                Value="0" />
-                            <TextBlock
-                                x:Name="UsageSummaryTextBlock"
-                                VerticalAlignment="Center"
-                                Foreground="{ThemeResource TextFillColorSecondaryBrush}"
-                                Style="{StaticResource CaptionTextBlockStyle}" />
-                        </StackPanel>
-                    </Grid>
-
-                    <!--  Row 2: Action-specific options  -->
-                    <Grid ColumnSpacing="8">
                         <Grid.ColumnDefinitions>
                             <ColumnDefinition Width="*" />
                             <ColumnDefinition Width="Auto" />
@@ -284,11 +263,24 @@
                             x:Name="SummarizeOptionsPanel"
                             Spacing="8"
                             Visibility="Collapsed">
-                            <TextBlock
+
-                                Foreground="{ThemeResource TextFillColorSecondaryBrush}"
+                            <StackPanel Orientation="Horizontal" Spacing="8">
-                                Style="{StaticResource CaptionTextBlockStyle}"
+                                <TextBlock
-                                Text="{x:Bind domain:Translator.Composer_AiSummarizeDescription, Mode=OneWay}" />
+                                    VerticalAlignment="Center"
-                            <StackPanel Orientation="Horizontal" Spacing="4">
+                                    Foreground="{ThemeResource TextFillColorSecondaryBrush}"
+                                    Style="{StaticResource CaptionTextBlockStyle}"
+                                    Text="{x:Bind domain:Translator.Composer_AiTranslateLanguage, Mode=OneWay}" />
+                                <ComboBox
+                                    x:Name="SummarizeLanguageComboBox"
+                                    MinWidth="120"
+                                    SelectionChanged="SummarizeLanguageComboBox_SelectionChanged">
+                                    <ComboBox.ItemTemplate>
+                                        <DataTemplate x:DataType="models:AiTranslateLanguageOption">
+                                            <TextBlock Text="{x:Bind Label}" />
+                                        </DataTemplate>
+                                    </ComboBox.ItemTemplate>
+                                </ComboBox>
+
                                 <Button
                                     x:Name="RunSummarizeButton"
                                     HorizontalAlignment="Left"
@@ -306,10 +298,30 @@
                                     ToolTipService.ToolTip="{x:Bind domain:Translator.Composer_AiSummarize, Mode=OneWay}"
                                     Visibility="Collapsed" />
                             </StackPanel>
+
                         </StackPanel>
 
                     </Grid>
-                </StackPanel>
+
+                    <!--  Column 3: Progress  -->
+                    <StackPanel
+                        Grid.Column="2"
+                        VerticalAlignment="Center"
+                        Orientation="Horizontal"
+                        Spacing="8">
+                        <ProgressBar
+                            x:Name="UsageProgressBar"
+                            Width="100"
+                            VerticalAlignment="Center"
+                            Maximum="1000"
+                            Value="0" />
+                        <TextBlock
+                            x:Name="UsageSummaryTextBlock"
+                            VerticalAlignment="Center"
+                            Foreground="{ThemeResource TextFillColorSecondaryBrush}"
+                            Style="{StaticResource CaptionTextBlockStyle}" />
+                    </StackPanel>
+                </Grid>
             </StackPanel>
         </Grid>
     </Border>

Wino.Mail.WinUI/Controls/AiActionsPanel.xaml.cs

@@ -25,6 +25,7 @@ public sealed partial class AiActionsPanel : UserControl, IDisposable
     private readonly IStoreManagementService _storeManagementService = App.Current.Services.GetRequiredService<IStoreManagementService>();
     private readonly IMailDialogService _dialogService = App.Current.Services.GetRequiredService<IMailDialogService>();
     private readonly IAiActionOptionsService _optionsService = App.Current.Services.GetRequiredService<IAiActionOptionsService>();
+    private readonly IPreferencesService _preferencesService = App.Current.Services.GetRequiredService<IPreferencesService>();
 
     private bool _disposedValue;
     private bool _isRefreshing;
@@ -43,6 +44,8 @@ public sealed partial class AiActionsPanel : UserControl, IDisposable
 
     public AiTranslateLanguageOption? SelectedTranslateLanguageOption { get; set; }
 
+    public AiTranslateLanguageOption? SelectedSummarizeLanguageOption { get; set; }
+
     public AiRewriteModeOption? SelectedRewriteModeOption { get; set; }
 
     public AiActionsPanel()
@@ -90,19 +93,33 @@ public sealed partial class AiActionsPanel : UserControl, IDisposable
     {
         // Save current selections before replacing ItemsSource (which clears SelectedItem).
         var previousTranslateCode = SelectedTranslateLanguageOption?.Code;
+        var previousSummarizeCode = SelectedSummarizeLanguageOption?.Code;
         var previousRewriteMode = SelectedRewriteModeOption?.Mode;
+        var preferredTranslateCode = string.IsNullOrWhiteSpace(previousTranslateCode)
+            ? _preferencesService.AiDefaultTranslationLanguageCode
+            : previousTranslateCode;
+        var preferredSummarizeCode = string.IsNullOrWhiteSpace(previousSummarizeCode)
+            ? _preferencesService.AiSummarizeLanguageCode
+            : previousSummarizeCode;
 
         _translateOptions = _optionsService.GetTranslateLanguageOptions();
         _rewriteOptions = _optionsService.GetRewriteModeOptions();
 
         TranslateLanguageComboBox.ItemsSource = _translateOptions;
+        SummarizeLanguageComboBox.ItemsSource = _translateOptions;
         RewriteModeComboBox.ItemsSource = _rewriteOptions;
 
         // Restore selection by matching on value, falling back to first item.
-        SelectedTranslateLanguageOption = FindOption(_translateOptions, o => o.Code == previousTranslateCode) ?? (_translateOptions.Count > 0 ? _translateOptions[0] : null);
+        SelectedTranslateLanguageOption = FindOption(_translateOptions, o => o.Code == preferredTranslateCode)
+                                          ?? FindOption(_translateOptions, o => o.Code == "en-US")
+                                          ?? (_translateOptions.Count > 0 ? _translateOptions[0] : null);
+        SelectedSummarizeLanguageOption = FindOption(_translateOptions, o => o.Code == preferredSummarizeCode)
+                                          ?? FindOption(_translateOptions, o => o.Code == "en-US")
+                                          ?? (_translateOptions.Count > 0 ? _translateOptions[0] : null);
         SelectedRewriteModeOption = FindOption(_rewriteOptions, o => o.Mode == previousRewriteMode) ?? (_rewriteOptions.Count > 0 ? _rewriteOptions[0] : null);
 
         TranslateLanguageComboBox.SelectedItem = SelectedTranslateLanguageOption;
+        SummarizeLanguageComboBox.SelectedItem = SelectedSummarizeLanguageOption;
         RewriteModeComboBox.SelectedItem = SelectedRewriteModeOption;
         UpdateRewriteOptionState();
     }
@@ -293,6 +310,7 @@ public sealed partial class AiActionsPanel : UserControl, IDisposable
         BusyProgressBar.Visibility = isBusy ? Visibility.Visible : Visibility.Collapsed;
         ActionSelector.IsEnabled = !isBusy;
         TranslateLanguageComboBox.IsEnabled = !isBusy;
+        SummarizeLanguageComboBox.IsEnabled = !isBusy;
         RewriteModeComboBox.IsEnabled = !isBusy;
         CustomRewriteTextBox.IsEnabled = !isBusy;
         RunTranslateButton.IsEnabled = !isBusy;
@@ -426,6 +444,7 @@ public sealed partial class AiActionsPanel : UserControl, IDisposable
         if (TranslateLanguageComboBox.SelectedItem is AiTranslateLanguageOption option)
         {
             SelectedTranslateLanguageOption = option;
+            _preferencesService.AiDefaultTranslationLanguageCode = option.Code;
         }
     }
 
@@ -438,6 +457,15 @@ public sealed partial class AiActionsPanel : UserControl, IDisposable
         }
     }
 
+    private void SummarizeLanguageComboBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
+    {
+        if (SummarizeLanguageComboBox.SelectedItem is AiTranslateLanguageOption option)
+        {
+            SelectedSummarizeLanguageOption = option;
+            _preferencesService.AiSummarizeLanguageCode = option.Code;
+        }
+    }
+
     private void UpdateRewriteOptionState()
     {
         var isCustom = SelectedRewriteModeOption?.IsCustom ?? false;
@@ -500,6 +528,12 @@ public sealed partial class AiActionsPanel : UserControl, IDisposable
                 return;
             }
 
+            if (action == AiActionType.Summarize && SelectedSummarizeLanguageOption == null)
+            {
+                _dialogService.InfoBarMessage(Translator.Composer_AiErrorTitle, Translator.WinoAccount_Error_ValidationFailed, InfoBarMessageType.Error);
+                return;
+            }
+
             if (action == AiActionType.Translate)
             {
                 var cachedTranslation = await HtmlHost.TryGetCachedTranslationHtmlAsync(SelectedTranslateLanguageOption?.Code ?? string.Empty, cancellationToken).ConfigureAwait(true);
@@ -539,7 +573,7 @@ public sealed partial class AiActionsPanel : UserControl, IDisposable
             {
                 AiActionType.Translate => await _profileService.TranslateAsync(html, SelectedTranslateLanguageOption?.Code ?? string.Empty, cancellationToken).ConfigureAwait(true),
                 AiActionType.Rewrite => await _profileService.RewriteAsync(html, ResolveRewriteMode(), cancellationToken).ConfigureAwait(true),
-                AiActionType.Summarize => await _profileService.SummarizeAsync(html, cancellationToken).ConfigureAwait(true),
+                AiActionType.Summarize => await _profileService.SummarizeAsync(html, SelectedSummarizeLanguageOption?.Code ?? string.Empty, cancellationToken).ConfigureAwait(true),
                 _ => ApiEnvelope<AiTextResultDto>.Failure(ApiErrorCodes.ValidationFailed)
             };
 
@@ -684,7 +718,11 @@ public sealed partial class AiActionsPanel : UserControl, IDisposable
 
             try
             {
-                var path = await _dialogService.PickFilePathAsync(HtmlHost.GetSuggestedSummaryFileName());
+                var configuredSummarySavePath = _preferencesService.AiSummarySavePath;
+                var path = !string.IsNullOrWhiteSpace(configuredSummarySavePath) && Directory.Exists(configuredSummarySavePath)
+                    ? Path.Combine(configuredSummarySavePath, HtmlHost.GetSuggestedSummaryFileName())
+                    : await _dialogService.PickFilePathAsync(HtmlHost.GetSuggestedSummaryFileName());
+
                 if (string.IsNullOrWhiteSpace(path))
                 {
                     args.Cancel = true;

Wino.Mail.WinUI/Services/PreferencesService.cs

@@ -389,6 +389,24 @@ public class PreferencesService(IConfigurationService configurationService) : Ob
         set => SetPropertyAndSave(nameof(IsWinoAccountButtonHidden), value);
     }
 
+    public string AiDefaultTranslationLanguageCode
+    {
+        get => _configurationService.Get(nameof(AiDefaultTranslationLanguageCode), "en-US");
+        set => SetPropertyAndSave(nameof(AiDefaultTranslationLanguageCode), string.IsNullOrWhiteSpace(value) ? "en-US" : value.Trim());
+    }
+
+    public string AiSummarizeLanguageCode
+    {
+        get => _configurationService.Get(nameof(AiSummarizeLanguageCode), "en-US");
+        set => SetPropertyAndSave(nameof(AiSummarizeLanguageCode), string.IsNullOrWhiteSpace(value) ? "en-US" : value.Trim());
+    }
+
+    public string AiSummarySavePath
+    {
+        get => _configurationService.Get(nameof(AiSummarySavePath), string.Empty);
+        set => SetPropertyAndSave(nameof(AiSummarySavePath), value?.Trim() ?? string.Empty);
+    }
+
     public WinoApplicationMode DefaultApplicationMode
     {
         get

Wino.Mail.WinUI/Views/Settings/AppPreferencesPage.xaml

@@ -7,6 +7,7 @@
     xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
     xmlns:domain="using:Wino.Core.Domain"
     xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+    xmlns:models="using:Wino.Core.Domain.Models.Ai"
     xmlns:muxc="using:Microsoft.UI.Xaml.Controls"
     xmlns:translations="using:Wino.Core.Domain.Models.Translations"
     mc:Ignorable="d">
@@ -74,6 +75,67 @@
                     <FontIcon FontFamily="{StaticResource SymbolThemeFontFamily}" Glyph="&#xE896;" />
                 </controls:SettingsCard.HeaderIcon>
             </controls:SettingsCard>
+
+            <controls:SettingsExpander
+                Description="{x:Bind domain:Translator.SettingsAppPreferences_AiActions_Description}"
+                Header="{x:Bind domain:Translator.SettingsAppPreferences_AiActions_Title}"
+                IsExpanded="True">
+                <controls:SettingsExpander.HeaderIcon>
+                    <FontIcon FontFamily="{StaticResource SymbolThemeFontFamily}" Glyph="&#xE734;" />
+                </controls:SettingsExpander.HeaderIcon>
+                <controls:SettingsExpander.Items>
+                    <controls:SettingsCard Description="{x:Bind domain:Translator.SettingsAppPreferences_AiDefaultTranslationLanguage_Description}" Header="{x:Bind domain:Translator.SettingsAppPreferences_AiDefaultTranslationLanguage_Title}">
+                        <ComboBox ItemsSource="{x:Bind ViewModel.AvailableAiLanguages, Mode=OneWay}" SelectedItem="{x:Bind ViewModel.SelectedDefaultTranslationLanguage, Mode=TwoWay}">
+                            <ComboBox.ItemTemplate>
+                                <DataTemplate x:DataType="models:AiTranslateLanguageOption">
+                                    <TextBlock Text="{x:Bind Label}" />
+                                </DataTemplate>
+                            </ComboBox.ItemTemplate>
+                        </ComboBox>
+                    </controls:SettingsCard>
+
+                    <controls:SettingsCard Description="{x:Bind domain:Translator.SettingsAppPreferences_AiSummarizeLanguage_Description}" Header="{x:Bind domain:Translator.SettingsAppPreferences_AiSummarizeLanguage_Title}">
+                        <ComboBox ItemsSource="{x:Bind ViewModel.AvailableAiLanguages, Mode=OneWay}" SelectedItem="{x:Bind ViewModel.SelectedSummarizeLanguage, Mode=TwoWay}">
+                            <ComboBox.ItemTemplate>
+                                <DataTemplate x:DataType="models:AiTranslateLanguageOption">
+                                    <TextBlock Text="{x:Bind Label}" />
+                                </DataTemplate>
+                            </ComboBox.ItemTemplate>
+                        </ComboBox>
+                    </controls:SettingsCard>
+
+                    <controls:SettingsCard
+                        Description="{x:Bind domain:Translator.SettingsAppPreferences_AiSummarySavePath_Description}"
+                        Header="{x:Bind domain:Translator.SettingsAppPreferences_AiSummarySavePath_Title}"
+                        HorizontalContentAlignment="Stretch"
+                        VerticalContentAlignment="Stretch"
+                        ContentAlignment="Vertical">
+                        <StackPanel Spacing="8">
+                            <Grid ColumnSpacing="12">
+                                <Grid.ColumnDefinitions>
+                                    <ColumnDefinition Width="*" />
+                                    <ColumnDefinition Width="Auto" />
+                                </Grid.ColumnDefinitions>
+                                <TextBox
+                                    Grid.Column="0"
+                                    IsReadOnly="True"
+                                    PlaceholderText="{x:Bind domain:Translator.SettingsAppPreferences_AiSummarySavePath_Placeholder}"
+                                    Text="{x:Bind ViewModel.SummarySavePath, Mode=OneWay}" />
+                                <Button
+                                    Grid.Column="1"
+                                    Command="{x:Bind ViewModel.BrowseSummarySavePathCommand}"
+                                    Content="{x:Bind domain:Translator.Buttons_Browse}" />
+                            </Grid>
+                            <TextBlock
+                                Foreground="{ThemeResource SystemFillColorCautionBrush}"
+                                Style="{StaticResource CaptionTextBlockStyle}"
+                                Text="{x:Bind domain:Translator.SettingsAppPreferences_AiSummarySavePath_InvalidHint}"
+                                TextWrapping="WrapWholeWords"
+                                Visibility="{x:Bind ViewModel.HasInvalidSummarySavePath, Mode=OneWay}" />
+                        </StackPanel>
+                    </controls:SettingsCard>
+                </controls:SettingsExpander.Items>
+            </controls:SettingsExpander>
         </StackPanel>
 
         <VisualStateManager.VisualStateGroups>

Wino.Services/WinoAccountApiClient.cs

@@ -108,11 +108,11 @@ public sealed class WinoAccountApiClient : IWinoAccountApiClient, IDisposable
     public Task<ApiEnvelope<AiStatusResultDto>> GetAiStatusAsync(CancellationToken cancellationToken = default)
         => SendAuthorizedRequestAsync("api/v1/ai/status", WinoAccountApiJsonContext.Default.ApiEnvelopeAiStatusResultDto, cancellationToken);
 
-    public Task<ApiEnvelope<AiTextResultDto>> SummarizeAsync(string html, CancellationToken cancellationToken = default)
+    public Task<ApiEnvelope<AiTextResultDto>> SummarizeAsync(string html, string targetLanguage, CancellationToken cancellationToken = default)
         => SendAuthorizedRequestAsync(
             HttpMethod.Post,
             "api/v1/ai/summarize",
-            new SummarizeRequest(html),
+            new SummarizeRequest(html, targetLanguage),
             WinoAccountApiJsonContext.Default.SummarizeRequest,
             WinoAccountApiJsonContext.Default.ApiEnvelopeAiTextResultDto,
             cancellationToken);

Wino.Services/WinoAccountProfileService.cs

@@ -213,8 +213,8 @@ public sealed class WinoAccountProfileService : BaseDatabaseService, IWinoAccoun
         return response;
     }
 
-    public async Task<ApiEnvelope<AiTextResultDto>> SummarizeAsync(string html, CancellationToken cancellationToken = default)
+    public async Task<ApiEnvelope<AiTextResultDto>> SummarizeAsync(string html, string targetLanguage, CancellationToken cancellationToken = default)
-        => await ExecuteAiOperationAsync(account => _apiClient.SummarizeAsync(html, cancellationToken), "summarize", cancellationToken).ConfigureAwait(false);
+        => await ExecuteAiOperationAsync(account => _apiClient.SummarizeAsync(html, targetLanguage, cancellationToken), "summarize", cancellationToken).ConfigureAwait(false);
 
     public async Task<ApiEnvelope<AiTextResultDto>> TranslateAsync(string html, string targetLanguage, CancellationToken cancellationToken = default)
         => await ExecuteAiOperationAsync(account => _apiClient.TranslateAsync(html, targetLanguage, cancellationToken), "translate", cancellationToken).ConfigureAwait(false);