feat: add Reachability Center and Why Drawer components with tests

- Implemented ReachabilityCenterComponent for displaying asset reachability status with summary and filtering options.
- Added ReachabilityWhyDrawerComponent to show detailed reachability evidence and call paths.
- Created unit tests for both components to ensure functionality and correctness.
- Updated accessibility test results for the new components.

src/Concelier/Directory.Build.props

@@ -2,34 +2,26 @@
   <PropertyGroup>
     <!-- Keep Concelier test harness active while trimming Mongo dependencies. Allow opt-out per project. -->
     <UseConcelierTestInfra Condition="'$(UseConcelierTestInfra)'==''">true</UseConcelierTestInfra>
-    <!-- Suppress noisy warnings from duplicate usings and analyzer fixture hints while Mongo shims are in play. -->
+    <!-- Suppress noisy warnings from duplicate usings and analyzer fixture hints during Concelier test harness runs. -->
     <NoWarn>$(NoWarn);CS0105;CS1591;CS8601;CS8602;CS8604;CS0618;RS1032;RS2007;xUnit1041;xUnit1031;xUnit2013;NU1510;NETSDK1023;SYSLIB0057</NoWarn>
   </PropertyGroup>
-  <ItemGroup>
-    <!-- Concelier is migrating off MongoDB; strip implicit Mongo2Go/Mongo driver packages inherited from the repo root. -->
-    <PackageReference Remove="Mongo2Go" />
-    <PackageReference Remove="MongoDB.Driver" />
-    <PackageReference Remove="MongoDB.Bson" />
-  </ItemGroup>
   <ItemGroup Condition="$([System.String]::Copy('$(MSBuildProjectName)').EndsWith('.Tests')) and '$(UseConcelierTestInfra)'=='true'">
     <PackageReference Include="coverlet.collector" Version="6.0.4" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.14.0" />
     <PackageReference Include="Microsoft.AspNetCore.Mvc.Testing" Version="10.0.0-rc.2.25502.107" />
-    <PackageReference Include="xunit" Version="2.9.2" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="2.8.2" />
-    <PackageReference Include="Microsoft.Extensions.TimeProvider.Testing" Version="9.10.0" />
+    <PackageReference Include="xunit" Version="2.9.3" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="3.0.1" />
+    <PackageReference Include="Microsoft.Extensions.TimeProvider.Testing" Version="10.0.0" />
     <ProjectReference Include="$(MSBuildThisFileDirectory)__Libraries\StellaOps.Concelier.Testing\StellaOps.Concelier.Testing.csproj"
                       Condition="Exists('$(MSBuildThisFileDirectory)__Libraries\StellaOps.Concelier.Testing\StellaOps.Concelier.Testing.csproj')" />
+    <Compile Include="$(MSBuildThisFileDirectory)StellaOps.Concelier.Tests.Shared\AssemblyInfo.cs"
+             Link="Shared/AssemblyInfo.cs"
+             Condition="Exists('$(MSBuildThisFileDirectory)StellaOps.Concelier.Tests.Shared\AssemblyInfo.cs')" />
+    <Compile Include="$(MSBuildThisFileDirectory)StellaOps.Concelier.Tests.Shared\ConcelierFixtureCollection.cs"
+             Link="Shared/ConcelierFixtureCollection.cs"
+             Condition="Exists('$(MSBuildThisFileDirectory)StellaOps.Concelier.Tests.Shared\ConcelierFixtureCollection.cs')" />
     <Using Include="StellaOps.Concelier.Testing"
            Condition="Exists('$(MSBuildThisFileDirectory)__Libraries\StellaOps.Concelier.Testing\StellaOps.Concelier.Testing.csproj')" />
     <Using Include="Xunit" />
   </ItemGroup>
-  <!-- Keep OpenSSL shim sources available to Mongo2Go-free test harnesses if needed. -->
-  <ItemGroup Condition="$([System.String]::Copy('$(MSBuildProjectName)').EndsWith('.Tests')) and '$(UseConcelierTestInfra)'=='true'">
-    <None Include="$(MSBuildThisFileDirectory)..\..\tests\native\openssl-1.1\linux-x64\*.so.1.1"
-          Link="native/linux-x64/%(Filename)%(Extension)"
-          CopyToOutputDirectory="PreserveNewest" />
-    <Compile Include="$(MSBuildThisFileDirectory)..\..\tests\shared\OpenSslLegacyShim.cs" Link="Shared/OpenSslLegacyShim.cs" />
-    <Compile Include="$(MSBuildThisFileDirectory)..\..\tests\shared\OpenSslAutoInit.cs" Link="Shared/OpenSslAutoInit.cs" />
-  </ItemGroup>
 </Project>