Add new type files from decompiled source

- FlexDirection, FlexWrap, FlexJustify, FlexAlignItems, FlexAlignContent, FlexAlignSelf enums
- FlexBasis struct for flex layout
- ContextMenuItem class for context menus
- ISkiaQueryAttributable interface for shell navigation
- SkiaTextSpan class for formatted text

These types support FlexLayout, context menus, and text formatting.
Other types (event args, enums, etc.) were already defined inline in View files.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Types/ContextMenuItem.cs

@@ -0,0 +1,32 @@
+using System;
+
+namespace Microsoft.Maui.Platform;
+
+public class ContextMenuItem
+{
+    public string Text { get; }
+
+    public Action? Action { get; }
+
+    public bool IsEnabled { get; }
+
+    public bool IsSeparator { get; }
+
+    public static ContextMenuItem Separator => new ContextMenuItem();
+
+    public ContextMenuItem(string text, Action? action, bool isEnabled = true)
+    {
+        Text = text;
+        Action = action;
+        IsEnabled = isEnabled;
+        IsSeparator = false;
+    }
+
+    private ContextMenuItem()
+    {
+        Text = "";
+        Action = null;
+        IsEnabled = false;
+        IsSeparator = true;
+    }
+}

Types/FlexAlignContent.cs

@@ -0,0 +1,11 @@
+namespace Microsoft.Maui.Platform;
+
+public enum FlexAlignContent
+{
+    Start,
+    Center,
+    End,
+    Stretch,
+    SpaceBetween,
+    SpaceAround
+}

Types/FlexAlignItems.cs

@@ -0,0 +1,9 @@
+namespace Microsoft.Maui.Platform;
+
+public enum FlexAlignItems
+{
+    Start,
+    Center,
+    End,
+    Stretch
+}

Types/FlexAlignSelf.cs

@@ -0,0 +1,10 @@
+namespace Microsoft.Maui.Platform;
+
+public enum FlexAlignSelf
+{
+    Auto,
+    Start,
+    Center,
+    End,
+    Stretch
+}

Types/FlexBasis.cs

@@ -0,0 +1,26 @@
+namespace Microsoft.Maui.Platform;
+
+public struct FlexBasis
+{
+    public bool IsAuto { get; }
+
+    public float Length { get; }
+
+    public static FlexBasis Auto => new FlexBasis(isAuto: true, 0f);
+
+    private FlexBasis(bool isAuto, float length)
+    {
+        IsAuto = isAuto;
+        Length = length;
+    }
+
+    public static FlexBasis FromLength(float length)
+    {
+        return new FlexBasis(isAuto: false, length);
+    }
+
+    public static implicit operator FlexBasis(float length)
+    {
+        return FromLength(length);
+    }
+}

Types/FlexDirection.cs

@@ -0,0 +1,9 @@
+namespace Microsoft.Maui.Platform;
+
+public enum FlexDirection
+{
+    Row,
+    RowReverse,
+    Column,
+    ColumnReverse
+}

Types/FlexJustify.cs

@@ -0,0 +1,11 @@
+namespace Microsoft.Maui.Platform;
+
+public enum FlexJustify
+{
+    Start,
+    Center,
+    End,
+    SpaceBetween,
+    SpaceAround,
+    SpaceEvenly
+}

Types/FlexWrap.cs

@@ -0,0 +1,8 @@
+namespace Microsoft.Maui.Platform;
+
+public enum FlexWrap
+{
+    NoWrap,
+    Wrap,
+    WrapReverse
+}

Types/ISkiaQueryAttributable.cs

@@ -0,0 +1,8 @@
+using System.Collections.Generic;
+
+namespace Microsoft.Maui.Platform;
+
+public interface ISkiaQueryAttributable
+{
+    void ApplyQueryAttributes(IDictionary<string, object> query);
+}

Types/SkiaTextSpan.cs

@@ -0,0 +1,28 @@
+using SkiaSharp;
+
+namespace Microsoft.Maui.Platform;
+
+public class SkiaTextSpan
+{
+    public string Text { get; set; } = "";
+
+    public SKColor? TextColor { get; set; }
+
+    public SKColor? BackgroundColor { get; set; }
+
+    public string? FontFamily { get; set; }
+
+    public float FontSize { get; set; }
+
+    public bool IsBold { get; set; }
+
+    public bool IsItalic { get; set; }
+
+    public bool IsUnderline { get; set; }
+
+    public bool IsStrikethrough { get; set; }
+
+    public float CharacterSpacing { get; set; }
+
+    public float LineHeight { get; set; } = 1f;
+}