Fix unresponsive Next button after navigating Back in Create Project wizard

[Copilot]

After filling in project details and navigating forward then back in the Create Project sub-wizard (Profile → Images → Back to Profile), the Next button becomes permanently disabled, requiring Cancel to exit.

Analysis

The Zafiro wizard library caches step commands (nextCommands[0]). On back-navigation, the cached ReactiveCommand's CanExecute state is propagated through multiple ObserveOn(MainThreadScheduler) layers. This creates a timing window where the button re-binds to the cached command while its internal _canExecute value is still false (from the IsExecuting: true → false transition during the first forward navigation), and the subsequent true update has not yet been dispatched.

Changes

• ReactiveValidationExtensions.WhenValid: Replaced Observable.Defer + FromEventPattern with a hot, published observable using Publish().RefCount() so the latest validity value is always immediately available to new subscribers and does not depend on a new ErrorsChanged event firing to unblock the cached command's CanExecute chain.
• ProjectProfileViewModel.IsValid (and similar ViewModels): Backed by a field initialized at construction time to ensure a single, stable observable instance is passed to the wizard's command factory — eliminating any ambiguity around observable identity across the caching lifecycle.

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 get --global cal/bin/bash user.name (dns block)
• www.nuget.org
  • Triggering command: /home/REDACTED/work/_temp/ghcca-node/node/bin/node /home/REDACTED/work/_temp/ghcca-node/node/bin/node --enable-source-maps /home/REDACTED/work/_temp/copilot-developer-action-main/dist/index.js (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)

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