Synchronize window title with navigation bar header

[Copilot]

This PR implements automatic synchronization of the window title with the navigation bar header, addressing the user request to have the window title reflect the current page's navigation bar content.

Changes Made

Core Implementation

• MainWindow.axaml: Added x:Name="MainView" to enable code-behind access to the ShellView
• MainWindow.axaml.cs: Added property change listener in OnLoaded() that:
  • Listens to MainView.ContentView.PropertyChanged events
  • Detects when StackContentView.CurrentViewProperty changes (navigation occurs)
  • Extracts header using NavigationBar.GetHeader(newValue) as string
  • Updates window Title property with the header value or defaults to "Shell Example"

Compatibility Fixes

• NavigationStack.cs: Converted primary constructor to traditional constructor for .NET 8.0 compatibility
• HostedItemsHelper.cs: Converted primary constructors to traditional constructors for .NET 8.0 compatibility

How It Works

The implementation follows the approach suggested by @OmidID in the issue comments:

MainView.ContentView.PropertyChanged += (sender, args) =>
{
    if (args.Property == StackContentView.CurrentViewProperty)
    {
        if (args.NewValue is AvaloniaObject newValue)
        {
            var header = NavigationBar.GetHeader(newValue) as string;
            Title = header ?? "Shell Example";
        }
    }
};

Example Behavior

• Navigate to HomePage (NavigationBar.Header="Home") → Window title: "Home"
• Navigate to SettingView (NavigationBar.Header="Settings") → Window title: "Settings"
• Navigate to ProfileView (NavigationBar.Header="Profile") → Window title: "Profile"
• Page with no header set → Window title: "Shell Example" (fallback)

The solution provides automatic synchronization without requiring manual title updates and includes proper null safety checks.

Fixes #97.

Warning

Firewall rules blocked me from connecting to one or more addresses

I tried to connect to the following addresses, but was blocked by firewall rules:

• av-build-tel-api-v1.avaloniaui.net
  • Triggering command: dotnet exec --runtimeconfig /home/REDACTED/.nuget/packages/avalonia.buildservices/0.0.31/tools/netstandard2.0/runtimeconfig.json /home/REDACTED/.nuget/packages/avalonia.buildservices/0.0.31/tools/netstandard2.0/Avalonia.BuildServices.Collector.dll (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to my firewall allow list

---

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[OmidID]

Add OnNavigate event to INavigator. and use that event in ShellExample.

ignore ShellBottomCustomNavigator

[Copilot]

Add OnNavigate event to INavigator. and use that event in ShellExample.

ignore ShellBottomCustomNavigator

Implemented OnNavigate event in INavigator interface and updated ShellExample to use it instead of property change listener. Event fires after successful navigation in Navigator.NotifyAsync(). Changes in commit 305d67c.

Warning

Firewall rules blocked me from connecting to one or more addresses

I tried to connect to the following addresses, but was blocked by firewall rules:

• av-build-tel-api-v1.avaloniaui.net
  • Triggering command: dotnet exec --runtimeconfig /home/REDACTED/.nuget/packages/avalonia.buildservices/0.0.31/tools/netstandard2.0/runtimeconfig.json /home/REDACTED/.nuget/packages/avalonia.buildservices/0.0.31/tools/netstandard2.0/Avalonia.BuildServices.Collector.dll (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to my firewall allow list