Fix BlazorUnitedApp sample missing shared framework references

[ilonatommy]

Description

Problem

After #64863, running the BlazorUnitedApp sample fails at runtime with:

System.IO.FileNotFoundException: Could not load file or assembly 'Microsoft.AspNetCore.Hosting, Version=11.0.0.0...'

Root Cause

PR #64863 replaced RemoveSharedFrameworkDependencies.cs with PrivateAssets=all metadata for shared framework references. As part of this change, sample projects needed explicit <Reference> items added for all their runtime dependencies.

The BlazorUnitedApp.csproj was updated with some references, but many were missing - particularly those required for Blazor Server apps with interactive components (Kestrel, SignalR, Authentication, DataProtection, etc.).

Fix

Added the missing <Reference> items to BlazorUnitedApp.csproj:

• Microsoft.AspNetCore.Authentication
• Microsoft.AspNetCore.Hosting
• Microsoft.AspNetCore.Server.Kestrel (and related transport assemblies)
• Microsoft.AspNetCore.SignalR (and related assemblies)
• Microsoft.AspNetCore.DataProtection (and related assemblies)
• Several other required assemblies

Testing

Verified the sample runs successfully with:

. .\activate.ps1
dotnet run --project src\Components\Samples\BlazorUnitedApp\BlazorUnitedApp.csproj /p:UseIisNativeAssets=false

[Copilot]

Pull request overview

Fixes the BlazorUnitedApp sample failing at runtime due to missing shared framework assembly references after the shared-framework dependency flow change in #64863.

Changes:

• Adds explicit <Reference> items to BlazorUnitedApp.csproj for required ASP.NET Core runtime dependencies (Hosting, Kestrel, SignalR, DataProtection, etc.).
• Ensures the sample has the necessary assemblies available at runtime for interactive server components scenarios.

[ilonatommy]

@wtgodbe, please let us know if any neater way comes to your mind.

[oroztocil]

Beautiful 😌

[oroztocil]

What about the BlazorServerApp? If we want to keep it around, it needs to be fixed as well.

[wtgodbe]

Thanks, this is the right fix

[ilonatommy]

What about the BlazorServerApp? If we want to keep it around, it needs to be fixed as well.

blazorserver template was deprecated starting with .net 8. I think we could remove it from the samples as net 7 had its end of support in 2024. Not in this PR ;)