Reconstruct XamlBrowser sample with XAML from decompiled code

Created complete XamlBrowser sample application:
- App.xaml: Colors and styles for light/dark theme support
- App.xaml.cs: BrowserApp with ToggleTheme()
- MainPage.xaml: Toolbar (Back, Forward, Refresh, Stop, Home),
  address bar, Go button, WebView, status bar with theme toggle
- MainPage.xaml.cs: Navigation logic, URL handling, progress animation
- MauiProgram.cs: UseLinuxPlatform() configuration
- Program.cs: LinuxProgramHost entry point
- Resources/Images: 10 SVG icons for toolbar (dark/light variants)

UI matches screenshot provided by user:
- Dark gray toolbar with navigation buttons
- Entry field for URL with rounded corners
- Green "Go" button
- WebView displaying content
- Status bar with theme toggle

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

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

samples/XamlBrowser/Resources/Images/arrow_forward_dark.svg

@@ -0,0 +1,3 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24">
+  <path fill="#202124" d="M12 4l-1.41 1.41L16.17 11H4v2h12.17l-5.58 5.59L12 20l8-8-8-8z"/>
+</svg>