Feature: Close editor tab with Ctrl+W

[Copilot]

No keyboard shortcut existed to close the active editor tab, requiring manual click on the tab's "X" button.

Changes

• src/OneWare.Core/App.axaml.cs: Registers a new "Close Tab" entry in the File menu bound to Ctrl+W, wired to CloseFileAsync on the current document (respects dirty-state save dialog). Menu item is disabled when no document is open.

windowService.RegisterMenuItem("MainWindow_MainMenu/File", new MenuItemModel("Close Tab")
{
    Command = new AsyncRelayCommand(
        () => { var dockService = Services.Resolve<IMainDockService>(); return dockService.CloseFileAsync(dockService.CurrentDocument!.FullPath); },
        () => Services.Resolve<IMainDockService>().CurrentDocument is not null),
    Header = "Close Tab",
    InputGesture = new KeyGesture(Key.W, PlatformHelper.ControlKey),
    Icon = new IconModel("VsImageLib.CloseDocumentGroup16X")
});

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

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

• av-build-tel-api-v1.avaloniaui.net
  • Triggering command: /usr/share/dotnet/dotnet dotnet exec --runtimeconfig /home/REDACTED/.nuget/packages/avalonia.buildservices/11.3.2/tools/netstandard2.0/runtimeconfig.json /home/REDACTED/.nuget/packages/avalonia.buildservices/11.3.2/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 the custom allowlist in this repository's Copilot coding agent settings (admins only)