Fix layout rendering, text wrapping, and scrollbar issues

- LinuxViewRenderer: Remove redundant child rendering that caused "View already has a parent" errors
- SkiaLabel: Consider LineBreakMode.WordWrap for multi-line measurement and rendering
- SkiaScrollView: Update ContentSize in OnDraw with properly constrained measurement
- SkiaShell: Account for padding in MeasureOverride (consistent with ArrangeOverride)
- Version bump to 1.0.0-preview.4

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

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

Views/SkiaShell.cs

@@ -287,14 +287,14 @@ public class SkiaShell : SkiaLayoutView
 
     protected override SKSize MeasureOverride(SKSize availableSize)
     {
-        // Measure current content
+        // Measure current content with padding accounted for (consistent with ArrangeOverride)
         if (_currentContent != null)
         {
             float contentTop = NavBarIsVisible ? NavBarHeight : 0;
             float contentBottom = TabBarIsVisible ? TabBarHeight : 0;
             var contentSize = new SKSize(
-                availableSize.Width,
-                availableSize.Height - contentTop - contentBottom);
+                availableSize.Width - (float)Padding.Left - (float)Padding.Right,
+                availableSize.Height - contentTop - contentBottom - (float)Padding.Top - (float)Padding.Bottom);
             _currentContent.Measure(contentSize);
         }