Merge core project into winui project.

Wino.Mail.WinUI/Converters/GridLengthConverter.cs

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+using System;
+using Microsoft.UI.Xaml;
+using Microsoft.UI.Xaml.Data;
+
+namespace Wino.Converters;
+
+public partial class GridLengthConverter : IValueConverter
+{
+    public object Convert(object value, Type targetType, object parameter, string language)
+    {
+        if (value is double doubleValue)
+        {
+            return new GridLength(doubleValue);
+        }
+        return new GridLength(1, GridUnitType.Auto);
+    }
+
+    public object ConvertBack(object value, Type targetType, object parameter, string language)
+    {
+        if (value is GridLength gridLength)
+        {
+            return gridLength.Value;
+        }
+        return 0.0;
+    }
+}

Wino.Mail.WinUI/Converters/HexToColorBrushConverter.cs

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+using System;
+using System.Globalization;
+using Microsoft.UI;
+using Microsoft.UI.Xaml;
+using Microsoft.UI.Xaml.Data;
+using Microsoft.UI.Xaml.Media;
+using Windows.UI;
+
+namespace Wino.Mail.WinUI.Converters;
+
+public partial class HexToColorBrushConverter : IValueConverter
+{
+    public object Convert(object value, Type targetType, object parameter, string language)
+    {
+        if (value is string hexColor && !string.IsNullOrEmpty(hexColor))
+        {
+            try
+            {
+                // Remove # if present
+                hexColor = hexColor.Replace("#", "");
+
+                // Parse hex to color
+                byte r = byte.Parse(hexColor.Substring(0, 2), System.Globalization.NumberStyles.HexNumber);
+                byte g = byte.Parse(hexColor.Substring(2, 2), System.Globalization.NumberStyles.HexNumber);
+                byte b = byte.Parse(hexColor.Substring(4, 2), System.Globalization.NumberStyles.HexNumber);
+
+                return new SolidColorBrush(Color.FromArgb(255, r, g, b));
+            }
+            catch
+            {
+                return GetDefaultBrush();
+            }
+        }
+
+        return GetDefaultBrush();
+    }
+
+    public object ConvertBack(object value, Type targetType, object parameter, string language)
+    {
+        if (value is string hexColor)
+        {
+            try
+            {
+                // Remove # if present
+                hexColor = hexColor.Replace("#", string.Empty);
+
+                // Parse ARGB values
+                byte a = 255; // Default to fully opaque
+                byte r = byte.Parse(hexColor.Substring(0, 2), NumberStyles.HexNumber);
+                byte g = byte.Parse(hexColor.Substring(2, 2), NumberStyles.HexNumber);
+                byte b = byte.Parse(hexColor.Substring(4, 2), NumberStyles.HexNumber);
+
+                // If 8-digit hex (with alpha), parse alpha value
+                if (hexColor.Length == 8)
+                {
+                    a = byte.Parse(hexColor.Substring(6, 2), NumberStyles.HexNumber);
+                }
+
+                return Color.FromArgb(a, r, g, b);
+            }
+            catch
+            {
+                return DependencyProperty.UnsetValue;
+            }
+        }
+
+        return DependencyProperty.UnsetValue;
+    }
+
+    private SolidColorBrush GetDefaultBrush()
+    {
+        // Get current theme's foreground brush.
+        // Bug: This should be ThemeResource to react to theme changes, but it's not.
+        // So if user changes the dark/light theme, this won't update.
+
+        if (WinoApplication.Current.UnderlyingThemeService.IsUnderlyingThemeDark())
+            return new SolidColorBrush(Colors.White);
+        else
+            return new SolidColorBrush(Colors.Black);
+    }
+}

Wino.Mail.WinUI/Converters/ReverseBooleanConverter.cs

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+using System;
+using Microsoft.UI.Xaml.Data;
+
+namespace Wino.Converters;
+
+public partial class ReverseBooleanConverter : IValueConverter
+{
+    public object Convert(object value, Type targetType, object parameter, string language)
+    {
+        if (value is bool boolval)
+            return !boolval;
+
+        return false;
+    }
+
+    public object ConvertBack(object value, Type targetType, object parameter, string language)
+    {
+        throw new NotImplementedException();
+    }
+}

Wino.Mail.WinUI/Converters/ReverseBooleanToVisibilityConverter.cs

@@ -0,0 +1,18 @@
+using System;
+using Microsoft.UI.Xaml;
+using Microsoft.UI.Xaml.Data;
+
+namespace Wino.Converters;
+
+public partial class ReverseBooleanToVisibilityConverter : IValueConverter
+{
+    public object Convert(object value, Type targetType, object parameter, string language)
+    {
+        return ((bool)value) ? Visibility.Collapsed : Visibility.Visible;
+    }
+
+    public object ConvertBack(object value, Type targetType, object parameter, string language)
+    {
+        throw new NotImplementedException();
+    }
+}