Fix executable Source column showing raw DCP template expressions instead of resolved argument values

[Copilot]

The dashboard Source column for executables with endpoint property references (e.g. endpoint.Property(EndpointProperty.TargetPort)) displayed raw DCP template expressions like {{- portForServing "exe" -}} instead of the resolved values already visible in the Executable arguments detail property.

Root cause

AppArgs (used by the Source column) is populated at executable creation time — before DCP resolves template expressions. Dynamic port references store the literal DCP template string. EffectiveArgs (populated post-run by DCP) has the actual resolved values, but was only used as a fallback when AppArgs was absent.

var app = builder.AddExecutable("exe", "pwsh.exe", ".")
    .WithHttpEndpoint();
var endpoint = app.GetEndpoint("http");

// This arg resolves to {{- portForServing "exe" -}} in AppArgs at creation time
app.WithArgs("-port")
   .WithArgs(x => x.Args.Add(endpoint.Property(EndpointProperty.TargetPort)));

Fix

• ResourceSourceViewModel.GetCommandLineInfo: For non-project executables, when EffectiveArgs (DCP-resolved) are available and non-empty, prefer them over AppArgs. Falls back to AppArgs when EffectiveArgs is not yet available (i.e., before the process has started).
• Tests: Added two cases — effective args preferred over template-containing app args, and app args used as fallback before process starts.

Checklist

• Is this feature complete?
  • Yes. Ready to ship.
  • No. Follow-up changes expected.
• Are you including unit tests for the changes and scenario tests if relevant?
  • Yes
  • No
• Did you add public API?
  • Yes
  • No
• Does the change make any security assumptions or guarantees?
  • Yes
  • No
• Does the change require an update in our Aspire docs?
  • Yes
  • No

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:

• 7k6vsblobprodcus337.vsblob.vsassets.io
  • Triggering command: /usr/share/dotnet/dotnet dotnet build src/Aspire.Dashboard/Aspire.Dashboard.csproj /p:TreatWarningsAsErrors=false (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)