feat(ui): complete Avalonia UI port with 7 main pages, tool settings & top MenuBar

src/ClawdDotNet.Desktop/Converters/ChatBubbleBrushConverter.cs

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+using System.Globalization;
+using Avalonia.Data.Converters;
+using Avalonia.Layout;
+using Avalonia.Media;
+
+namespace ClawdDotNet.Desktop.Converters;
+
+/// <summary>
+/// Färbt den Hintergrund einer Chat-Sprechblase für Benutzer-Nachrichten.
+/// </summary>
+public sealed class ChatBubbleBrushConverter : IValueConverter
+{
+    public static readonly ChatBubbleBrushConverter Instance = new();
+
+    private static readonly IBrush UserBubble = new SolidColorBrush(Color.FromArgb(0x28, 0x00, 0x78, 0xD4));
+
+    public object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
+    {
+        if (value is bool isUser && isUser)
+            return UserBubble;
+
+        return null;
+    }
+
+    public object ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)
+        => throw new NotSupportedException("Nur zur Anzeige.");
+}
+
+/// <summary>
+/// Richtet Chat-Sprechblasen aus: Rechts für den Benutzer, links für den Agenten.
+/// </summary>
+public sealed class ChatAlignmentConverter : IValueConverter
+{
+    public static readonly ChatAlignmentConverter Instance = new();
+
+    public object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
+    {
+        if (value is bool isUser && isUser)
+            return HorizontalAlignment.Right;
+
+        return HorizontalAlignment.Left;
+    }
+
+    public object ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)
+        => throw new NotSupportedException("Nur zur Anzeige.");
+}
+
+/// <summary>
+/// Prüft, ob ein Tool-Name mit dem ConverterParameter übereinstimmt.
+/// </summary>
+public sealed class ToolMatchConverter : IValueConverter
+{
+    public static readonly ToolMatchConverter Instance = new();
+
+    public object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
+    {
+        if (value is string toolName && parameter is string targetTool)
+            return toolName.Equals(targetTool, StringComparison.OrdinalIgnoreCase);
+
+        return false;
+    }
+
+    public object ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)
+        => throw new NotSupportedException("Nur zur Anzeige.");
+}

src/ClawdDotNet.Desktop/Converters/LogLevelBrushConverter.cs

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+using System.Globalization;
+using Avalonia.Data.Converters;
+using Avalonia.Media;
+
+namespace ClawdDotNet.Desktop.Converters;
+
+/// <summary>
+/// Färbt eine Logzeile nach ihrer Stufe.
+///
+/// Bewusst nur Warnung und Fehler hervorgehoben — alles einzufärben macht die Ansicht
+/// unruhig und lenkt von genau den Zeilen ab, die auffallen sollen. Der Rest behält die
+/// Vordergrundfarbe des Themas und funktioniert damit hell wie dunkel.
+/// </summary>
+public sealed class LogLevelBrushConverter : IValueConverter
+{
+    public static readonly LogLevelBrushConverter Instance = new();
+
+    private static readonly IBrush Error = new SolidColorBrush(Color.FromRgb(0xE8, 0x4B, 0x4B));
+    private static readonly IBrush Warn = new SolidColorBrush(Color.FromRgb(0xD8, 0x9C, 0x2A));
+
+    public object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
+        => value as string switch
+        {
+            "ERR" or "FTL" => Error,
+            "WRN" => Warn,
+            // null heißt: Bindung greift nicht, das Steuerelement behält seine eigene
+            // Farbe aus dem Thema.
+            _ => null
+        };
+
+    public object ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)
+        => throw new NotSupportedException("Nur zur Anzeige.");
+}