RC1: Full XAML support with BindableProperty, VSM, and data binding

Phase 1 - BindableProperty Foundation:
- SkiaLayoutView: Convert Spacing, Padding, ClipToBounds to BindableProperty
- SkiaStackLayout: Convert Orientation to BindableProperty
- SkiaGrid: Convert RowSpacing, ColumnSpacing to BindableProperty
- SkiaCollectionView: Convert all 12 properties to BindableProperty
- SkiaShell: Convert all 12 properties to BindableProperty

Phase 2 - Visual State Manager:
- Add VSM integration to SkiaImageButton pointer handlers
- Support Normal, PointerOver, Pressed, Disabled states

Phase 3-4 - XAML/Data Binding:
- Type converters for SKColor, SKRect, SKSize, SKPoint
- BindingContext propagation through visual tree
- Full handler registration for all MAUI controls

Documentation:
- README: Add styling/binding examples, update roadmap
- Add RC1-ROADMAP.md with implementation details

Version: 1.0.0-rc.1

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

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

Views/SkiaImageButton.cs

@@ -315,6 +315,7 @@ public class SkiaImageButton : SkiaView
     {
         if (!IsEnabled) return;
         IsHovered = true;
+        SkiaVisualStateManager.GoToState(this, SkiaVisualStateManager.CommonStates.PointerOver);
         Invalidate();
     }
 
@@ -325,6 +326,9 @@ public class SkiaImageButton : SkiaView
         {
             IsPressed = false;
         }
+        SkiaVisualStateManager.GoToState(this, IsEnabled
+            ? SkiaVisualStateManager.CommonStates.Normal
+            : SkiaVisualStateManager.CommonStates.Disabled);
         Invalidate();
     }
 
@@ -333,6 +337,7 @@ public class SkiaImageButton : SkiaView
         if (!IsEnabled) return;
 
         IsPressed = true;
+        SkiaVisualStateManager.GoToState(this, SkiaVisualStateManager.CommonStates.Pressed);
         Invalidate();
         Pressed?.Invoke(this, EventArgs.Empty);
     }
@@ -343,6 +348,9 @@ public class SkiaImageButton : SkiaView
 
         var wasPressed = IsPressed;
         IsPressed = false;
+        SkiaVisualStateManager.GoToState(this, IsHovered
+            ? SkiaVisualStateManager.CommonStates.PointerOver
+            : SkiaVisualStateManager.CommonStates.Normal);
         Invalidate();
 
         Released?.Invoke(this, EventArgs.Empty);