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/App.xaml.cs

@@ -0,0 +1,20 @@
+using Microsoft.Maui;
+using Microsoft.Maui.ApplicationModel;
+using Microsoft.Maui.Controls;
+
+namespace XamlBrowser;
+
+public partial class BrowserApp : Application
+{
+    public BrowserApp()
+    {
+        InitializeComponent();
+        UserAppTheme = AppTheme.Dark;
+        MainPage = new MainPage();
+    }
+
+    public void ToggleTheme()
+    {
+        UserAppTheme = UserAppTheme == AppTheme.Light ? AppTheme.Dark : AppTheme.Light;
+    }
+}