Initial commit: .NET MAUI Linux Platform

Complete Linux platform implementation for .NET MAUI with:

- 35+ Skia-rendered controls (Button, Label, Entry, CarouselView, etc.)
- Platform services (Clipboard, FilePicker, Notifications, DragDrop, etc.)
- Accessibility support (AT-SPI2, High Contrast)
- HiDPI and Input Method support
- 216 unit tests
- CI/CD workflows
- Project templates
- Documentation

🤖 Generated with Claude Code

tests/Views/SkiaSliderTests.cs

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+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using FluentAssertions;
+using Microsoft.Maui.Platform;
+using SkiaSharp;
+using Xunit;
+
+namespace Microsoft.Maui.Controls.Linux.Tests.Views;
+
+public class SkiaSliderTests
+{
+    [Fact]
+    public void Constructor_SetsDefaultValues()
+    {
+        // Arrange & Act
+        var slider = new SkiaSlider();
+
+        // Assert
+        slider.Value.Should().Be(0);
+        slider.Minimum.Should().Be(0);
+        slider.Maximum.Should().Be(100); // Default maximum is 100
+        slider.IsEnabled.Should().BeTrue();
+    }
+
+    [Fact]
+    public void Value_WhenSet_ClampsToRange()
+    {
+        // Arrange
+        var slider = new SkiaSlider { Minimum = 0, Maximum = 100 };
+
+        // Act & Assert - Below minimum
+        slider.Value = -10;
+        slider.Value.Should().Be(0);
+
+        // Act & Assert - Above maximum
+        slider.Value = 150;
+        slider.Value.Should().Be(100);
+
+        // Act & Assert - Within range
+        slider.Value = 50;
+        slider.Value.Should().Be(50);
+    }
+
+    [Fact]
+    public void Value_WhenChanged_RaisesValueChangedEvent()
+    {
+        // Arrange
+        var slider = new SkiaSlider { Minimum = 0, Maximum = 100 };
+        var eventRaised = false;
+        double newValue = 0;
+        slider.ValueChanged += (s, e) =>
+        {
+            eventRaised = true;
+            newValue = slider.Value;
+        };
+
+        // Act
+        slider.Value = 50;
+
+        // Assert
+        eventRaised.Should().BeTrue();
+        newValue.Should().Be(50);
+    }
+
+    [Fact]
+    public void Minimum_WhenSet_UpdatesProperty()
+    {
+        // Arrange
+        var slider = new SkiaSlider { Minimum = 0, Maximum = 100 };
+
+        // Act
+        slider.Minimum = 20;
+
+        // Assert
+        slider.Minimum.Should().Be(20);
+    }
+
+    [Fact]
+    public void Maximum_WhenSet_UpdatesProperty()
+    {
+        // Arrange
+        var slider = new SkiaSlider { Minimum = 0, Maximum = 100 };
+
+        // Act
+        slider.Maximum = 50;
+
+        // Assert
+        slider.Maximum.Should().Be(50);
+    }
+
+    [Fact]
+    public void IsEnabled_DefaultsToTrue()
+    {
+        // Arrange & Act
+        var slider = new SkiaSlider();
+
+        // Assert
+        slider.IsEnabled.Should().BeTrue();
+    }
+
+    [Fact]
+    public void ValueChanged_EventCanBeSubscribed()
+    {
+        // Arrange
+        var slider = new SkiaSlider { Minimum = 0, Maximum = 100 };
+        var eventCount = 0;
+
+        // Act
+        slider.ValueChanged += (s, e) => eventCount++;
+        slider.Value = 50;
+        slider.Value = 75;
+
+        // Assert
+        eventCount.Should().Be(2);
+    }
+
+    [Fact]
+    public void Draw_DoesNotThrow()
+    {
+        // Arrange
+        var slider = new SkiaSlider { Value = 50, Minimum = 0, Maximum = 100 };
+        slider.Bounds = new SKRect(0, 0, 200, 40);
+
+        using var surface = SKSurface.Create(new SKImageInfo(300, 100));
+        var canvas = surface.Canvas;
+
+        // Act & Assert
+        var exception = Record.Exception(() => slider.Draw(canvas));
+        exception.Should().BeNull();
+    }
+
+    [Fact]
+    public void ThumbColor_WhenSet_UpdatesProperty()
+    {
+        // Arrange
+        var slider = new SkiaSlider();
+        var color = new SKColor(255, 0, 0);
+
+        // Act
+        slider.ThumbColor = color;
+
+        // Assert
+        slider.ThumbColor.Should().Be(color);
+    }
+
+    [Fact]
+    public void TrackColor_WhenSet_UpdatesProperty()
+    {
+        // Arrange
+        var slider = new SkiaSlider();
+        var color = new SKColor(0, 255, 0);
+
+        // Act
+        slider.TrackColor = color;
+
+        // Assert
+        slider.TrackColor.Should().Be(color);
+    }
+}