improve avalonia consistencies

src/UniGetUI.Avalonia/App.axaml

@@ -11,6 +11,7 @@
 
     <Application.Styles>
         <FluentTheme />
+        <StyleInclude Source="avares://AvaloniaEdit/Themes/Fluent/AvaloniaEdit.xaml"/>
         <StyleInclude Source="avares://UniGetUI.Avalonia/Assets/Styles/Styles.Common.axaml"/>
     </Application.Styles>
 </Application>

src/UniGetUI.Avalonia/UniGetUI.Avalonia.csproj

@@ -126,6 +126,7 @@
 
     <ItemGroup>
         <PackageReference Include="Avalonia" Version="12.0.4" />
+        <PackageReference Include="Avalonia.AvaloniaEdit" Version="12.0.0" />
         <PackageReference Include="Avalonia.Controls.DataGrid" Version="12.0.0" />
         <PackageReference Include="Avalonia.Desktop" Version="12.0.4" />
         <PackageReference Include="Avalonia.Themes.Fluent" Version="12.0.4" />

src/UniGetUI.Avalonia/ViewModels/SidebarViewModel.cs

@@ -60,7 +60,7 @@ partial void OnIsPaneOpenChanged(bool value)
         OnPropertyChanged(nameof(BundlesBadgeCompactVisible));
     }
 
-    public double PaneWidth => IsPaneOpen ? 250 : 72;
+    public double PaneWidth => IsPaneOpen ? 250 : 64;
 
     public bool UpdatesBadgeExpandedVisible => UpdatesBadgeVisible && IsPaneOpen;
     public bool UpdatesBadgeCompactVisible => UpdatesBadgeVisible && !IsPaneOpen;

src/UniGetUI.Avalonia/Views/Controls/LogTextEditor.cs

@@ -0,0 +1,104 @@
+using System.Text;
+using Avalonia;
+using Avalonia.Controls.Primitives;
+using Avalonia.Media;
+using Avalonia.Styling;
+using AvaloniaEdit;
+using AvaloniaEdit.Document;
+using AvaloniaEdit.Rendering;
+using UniGetUI.Avalonia.ViewModels.Pages.LogPages;
+
+namespace UniGetUI.Avalonia.Views.Controls;
+
+// Read-only colored log/console viewer shared by every log and command-output view: virtualized
+// rendering (smooth scroll), free character-level selection across lines, per-line colors, and a
+// theme-aware hyperlink color.
+public class LogTextEditor : TextEditor
+{
+    // Per physical line color, indexed by 0-based document line number.
+    private readonly List<IBrush> _lineColors = [];
+
+    // Use AvaloniaEdit's TextEditor theme/template; a subclass key has no matching ControlTheme.
+    protected override Type StyleKeyOverride => typeof(TextEditor);
+
+    public LogTextEditor()
+    {
+        IsReadOnly = true;
+        ShowLineNumbers = false;
+        WordWrap = true;
+        Background = Brushes.Transparent;
+        FontFamily = new FontFamily("Cascadia Mono,Consolas,Menlo,monospace");
+        FontSize = 12;
+        Padding = new Thickness(8);
+        HorizontalScrollBarVisibility = ScrollBarVisibility.Disabled;
+        VerticalScrollBarVisibility = ScrollBarVisibility.Auto;
+
+        TextArea.TextView.LineTransformers.Add(new SeverityColorizer(_lineColors));
+        UpdateLinkColor();
+        ActualThemeVariantChanged += (_, _) => UpdateLinkColor();
+    }
+
+    public void SetLines(IEnumerable<LogLineItem> lines)
+    {
+        _lineColors.Clear();
+        var sb = new StringBuilder();
+        bool first = true;
+
+        foreach (var item in lines)
+        {
+            foreach (string physicalLine in item.Text.Split('\n'))
+            {
+                if (!first) sb.Append('\n');
+                sb.Append(physicalLine);
+                _lineColors.Add(item.Foreground);
+                first = false;
+            }
+        }
+
+        Text = sb.ToString();
+        TextArea.TextView.Redraw();
+    }
+
+    public void AppendLine(LogLineItem line)
+    {
+        var sb = new StringBuilder();
+        foreach (string physicalLine in line.Text.Split('\n'))
+        {
+            if (Document.TextLength > 0 || sb.Length > 0)
+                sb.Append('\n');
+            sb.Append(physicalLine);
+            _lineColors.Add(line.Foreground);
+        }
+
+        Document.Insert(Document.TextLength, sb.ToString());
+    }
+
+    public void ClearLines()
+    {
+        _lineColors.Clear();
+        Text = string.Empty;
+    }
+
+    public void ScrollToBottom() => ScrollToEnd();
+
+    // AvaloniaEdit auto-links URLs; its default link brush is too dark to read on the dark theme.
+    private void UpdateLinkColor()
+    {
+        bool isDark = Application.Current?.ActualThemeVariant == ThemeVariant.Dark;
+        TextArea.TextView.LinkTextForegroundBrush =
+            new SolidColorBrush(isDark ? Color.FromRgb(100, 170, 255) : Color.FromRgb(0, 0, 205));
+    }
+
+    private sealed class SeverityColorizer(List<IBrush> lineColors) : DocumentColorizingTransformer
+    {
+        protected override void ColorizeLine(DocumentLine line)
+        {
+            if (line.Length == 0) return;
+            int index = line.LineNumber - 1;
+            if (index < 0 || index >= lineColors.Count) return;
+
+            IBrush brush = lineColors[index];
+            ChangeLinePart(line.Offset, line.EndOffset, element => element.TextRunProperties.SetForegroundBrush(brush));
+        }
+    }
+}

src/UniGetUI.Avalonia/Views/Controls/Settings/SettingsCard.cs

@@ -6,6 +6,7 @@
 using Avalonia.Interactivity;
 using Avalonia.Layout;
 using Avalonia.Media;
+using UniGetUI.Avalonia.Views.Controls;
 using ICommand = System.Windows.Input.ICommand;
 
 namespace UniGetUI.Avalonia.Views.Controls.Settings;
@@ -23,7 +24,7 @@ public class SettingsCard : UserControl
     private readonly ContentControl _descriptionPresenter;
     private readonly ContentControl _contentPresenter;
     private readonly StackPanel _descriptionRow;
-    private readonly TextBlock _chevron;
+    private readonly SvgIcon _chevron;
 
     // ── Styled properties ──────────────────────────────────────────────────
     public static readonly StyledProperty<object?> HeaderProperty =
@@ -178,10 +179,11 @@ public SettingsCard()
             Margin = new Thickness(16, 0, 0, 0),
         };
 
-        _chevron = new TextBlock
+        _chevron = new SvgIcon
         {
-            Text = "›",
-            FontSize = 20,
+            Path = "avares://UniGetUI.Avalonia/Assets/Symbols/forward.svg",
+            Width = 16,
+            Height = 16,
             VerticalAlignment = VerticalAlignment.Center,
             Opacity = 0.6,
             Margin = new Thickness(8, 0, 0, 0),

src/UniGetUI.Avalonia/Views/DialogPages/OperationFailedDialog.axaml

@@ -1,6 +1,7 @@
 <Window xmlns="https://github.com/avaloniaui"
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
         xmlns:automation="clr-namespace:Avalonia.Automation;assembly=Avalonia.Controls"
+        xmlns:controls="using:UniGetUI.Avalonia.Views.Controls"
         x:Class="UniGetUI.Avalonia.Views.DialogPages.OperationFailedDialog"
         Width="800" MinWidth="500"
         Height="550" MinHeight="300"
@@ -19,20 +20,14 @@
         </Border>
 
         <!-- ── Colored output log ── -->
-        <ScrollViewer Grid.Row="1"
-                      x:Name="OutputScroll"
-                      Margin="8,0,8,8"
-                      HorizontalScrollBarVisibility="Auto"
-                      VerticalScrollBarVisibility="Auto"
-                      Background="{DynamicResource AppDialogDarkBackground}"
-                      CornerRadius="6">
-            <SelectableTextBlock x:Name="OutputText"
-                                 Padding="8"
-                                 FontFamily="Cascadia Mono,Consolas,Menlo,monospace"
-                                 FontSize="12"
-                                 TextWrapping="Wrap"
-                                 automation:AutomationProperties.AccessibilityView="Raw"/>
-        </ScrollViewer>
+        <Border Grid.Row="1"
+                Margin="8,0,8,8"
+                CornerRadius="6"
+                ClipToBounds="True"
+                Background="{DynamicResource AppDialogDarkBackground}">
+            <controls:LogTextEditor x:Name="OutputText"
+                                    automation:AutomationProperties.AccessibilityView="Raw"/>
+        </Border>
 
         <!-- ── Footer buttons ── -->
         <Border Grid.Row="2"

src/UniGetUI.Avalonia/Views/DialogPages/OperationFailedDialog.axaml.cs

@@ -1,9 +1,9 @@
 using Avalonia;
 using Avalonia.Controls;
-using Avalonia.Controls.Documents;
 using Avalonia.Layout;
 using Avalonia.Media;
 using Avalonia.Threading;
+using UniGetUI.Avalonia.ViewModels.Pages.LogPages;
 using UniGetUI.Core.Tools;
 using UniGetUI.PackageEngine.Enums;
 using UniGetUI.PackageEngine.Operations;
@@ -30,8 +30,7 @@ public OperationFailedDialog(AbstractOperation operation)
         var normalBrush = Application.Current?.FindResource("SystemControlForegroundBaseHighBrush") as IBrush
                           ?? Brushes.White;
 
-        var inlines = OutputText.Inlines ??= new InlineCollection();
-        bool first = true;
+        var lines = new List<LogLineItem>();
         foreach (var (text, type) in operation.GetOutput())
         {
             IBrush brush = type switch
@@ -40,10 +39,9 @@ public OperationFailedDialog(AbstractOperation operation)
                 AbstractOperation.LineType.VerboseDetails => debugBrush,
                 _ => normalBrush,
             };
-            if (!first) inlines.Add(new LineBreak());
-            inlines.Add(new Run(text) { Foreground = brush });
-            first = false;
+            lines.Add(new LogLineItem(text, brush));
         }
+        OutputText.SetLines(lines);
 
         var closeButton = new Button
         {
@@ -64,7 +62,7 @@ public OperationFailedDialog(AbstractOperation operation)
     protected override void OnOpened(EventArgs e)
     {
         base.OnOpened(e);
-        Dispatcher.UIThread.Post(OutputScroll.ScrollToEnd, DispatcherPriority.Background);
+        Dispatcher.UIThread.Post(OutputText.ScrollToBottom, DispatcherPriority.Background);
     }
 
     private Control BuildRetryButton(AbstractOperation operation)

src/UniGetUI.Avalonia/Views/DialogPages/OperationOutputWindow.axaml

@@ -2,6 +2,7 @@
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
         xmlns:automation="clr-namespace:Avalonia.Automation;assembly=Avalonia.Controls"
         xmlns:vm="using:UniGetUI.Avalonia.ViewModels.DialogPages"
+        xmlns:controls="using:UniGetUI.Avalonia.Views.Controls"
         x:Class="UniGetUI.Avalonia.Views.DialogPages.OperationOutputWindow"
         x:DataType="vm:OperationOutputViewModel"
         Width="700" MinWidth="400"
@@ -12,19 +13,13 @@
         WindowStartupLocation="CenterOwner"
         Title="{Binding Title}">
 
-    <ScrollViewer x:Name="OutputScroll"
-                  Margin="8"
-                  HorizontalScrollBarVisibility="Auto"
-                  VerticalScrollBarVisibility="Auto"
-                  Background="{DynamicResource AppDialogDarkBackground}"
-                  CornerRadius="6">
-        <SelectableTextBlock x:Name="OutputText"
-                             Padding="8"
-                             FontFamily="Cascadia Mono,Consolas,Menlo,monospace"
-                             FontSize="12"
-                             TextWrapping="Wrap"
-                             automation:AutomationProperties.Name="{Binding Title}"
-                             automation:AutomationProperties.AccessibilityView="Raw"/>
-    </ScrollViewer>
+    <Border Margin="8"
+            CornerRadius="6"
+            ClipToBounds="True"
+            Background="{DynamicResource AppDialogDarkBackground}">
+        <controls:LogTextEditor x:Name="OutputText"
+                                automation:AutomationProperties.Name="{Binding Title}"
+                                automation:AutomationProperties.AccessibilityView="Raw"/>
+    </Border>
 
 </Window>

src/UniGetUI.Avalonia/Views/DialogPages/OperationOutputWindow.axaml.cs

@@ -1,6 +1,5 @@
 using System.Collections.Specialized;
 using Avalonia.Controls;
-using Avalonia.Controls.Documents;
 using Avalonia.Threading;
 using UniGetUI.Avalonia.ViewModels.DialogPages;
 using UniGetUI.Avalonia.ViewModels.Pages.LogPages;
@@ -17,9 +16,7 @@ public OperationOutputWindow(AbstractOperation operation)
         InitializeComponent();
         UniGetUI.Avalonia.Infrastructure.MicaWindowHelper.Apply(this);
 
-        foreach (var line in vm.OutputLines)
-            AppendLine(line);
-
+        OutputText.SetLines(vm.OutputLines);
         vm.OutputLines.CollectionChanged += OnOutputLinesChanged;
     }
 
@@ -29,28 +26,20 @@ private void OnOutputLinesChanged(object? sender, NotifyCollectionChangedEventAr
         {
             if (e.Action == NotifyCollectionChangedAction.Reset)
             {
-                OutputText.Inlines?.Clear();
+                OutputText.ClearLines();
             }
             else if (e.NewItems is not null)
             {
                 foreach (LogLineItem item in e.NewItems)
-                    AppendLine(item);
+                    OutputText.AppendLine(item);
             }
-            OutputScroll.ScrollToEnd();
+            OutputText.ScrollToBottom();
         }, DispatcherPriority.Background);
     }
 
-    private void AppendLine(LogLineItem line)
-    {
-        var inlines = OutputText.Inlines ??= new InlineCollection();
-        if (inlines.Count > 0)
-            inlines.Add(new LineBreak());
-        inlines.Add(new Run(line.Text) { Foreground = line.Foreground });
-    }
-
     protected override void OnOpened(EventArgs e)
     {
         base.OnOpened(e);
-        OutputScroll.ScrollToEnd();
+        OutputText.ScrollToBottom();
     }
 }

src/UniGetUI.Avalonia/Views/DialogPages/PackageDetailsWindow.axaml

@@ -253,9 +253,11 @@
                                 Spacing="8">
                         <Border CornerRadius="8" ClipToBounds="True"
                                 x:Name="ScreenshotsBorder"
-                                Background="#000000"
                                 Height="320">
                             <Panel>
+                                <!-- Black letterbox only behind actual screenshots; the empty-state
+                                     banner below composites over the themed window background instead. -->
+                                <Border Background="#000000" IsVisible="{Binding HasScreenshots}"/>
                                 <Carousel x:Name="ScreenshotsCarousel"
                                           IsVisible="{Binding HasScreenshots}"
                                           ItemsSource="{Binding Screenshots}"

src/UniGetUI.Avalonia/Views/MainWindow.axaml

@@ -364,7 +364,7 @@
                              Grid.Column="0"
                              MinHeight="20"
                              FontSize="15"
-                             CornerRadius="0"
+                             CornerRadius="3,0,0,3"
                              BorderThickness="0"
                              VerticalContentAlignment="Center"
                              Padding="8,0,4,0"