Add button finding and navigation tests for Merchants Index page

[Copilot]

Merchants Index page lacked test coverage for button interactions and navigation flows. Added 13 tests following patterns from Estate Index page tests.

Tests Added

• Button navigation: Add Merchant, View, Edit, Make Deposit
• Filter operations: Apply and Clear filters
• Pagination: First, Previous, Next, Last page navigation
• Error handling: Load failure navigation to error page
• Row click navigation to merchant details

Example Pattern

[Fact]
public void MerchantsIndex_ViewButton_NavigatesToMerchantDetailsPage()
{
    // Arrange
    var merchantId = Guid.NewGuid();
    var merchants = new List<MerchantModels.MerchantListModel> { /* ... */ };
    this.MerchantUIService.Setup(m => m.GetMerchants(/*...*/)).ReturnsAsync(Result.Success(merchants));
    
    var cut = RenderComponent<MerchantsIndex>();
    cut.WaitForState(() => !cut.Markup.Contains("animate-spin"), TimeSpan.FromSeconds(5));
    
    // Act
    var viewButton = cut.Find("#viewMerchantLink");
    viewButton.Click();
    
    // Assert
    _fakeNavigationManager.Uri.ShouldContain($"/merchants/{merchantId}");
}

All tests use FindAll("button") for text-based button finding and Find("#id") for ID-based element location, with _fakeNavigationManager to verify navigation behavior.

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:

• f.feedz.io
  • Triggering command: /usr/bin/dotnet dotnet test EstateManagementUI.BlazorServer.Tests/EstateManagementUI.BlazorServer.Tests.csproj --filter FullyQualifiedName~MerchantsIndexPageTests --logger console;verbosity=normal (dns block)
  • Triggering command: /opt/hostedtoolcache/CodeQL/2.24.0/x64/codeql/csharp/tools/linux64/Semmle.Autobuild.CSharp /opt/hostedtoolcache/CodeQL/2.24.0/x64/codeql/csharp/tools/linux64/Semmle.Autobuild.CSharp (dns block)
  • Triggering command: /usr/bin/dotnet dotnet restore --no-dependencies /home/REDACTED/work/EstateManagementUI/EstateManagementUI/EstateManagementUI.sln --packages /home/REDACTED/work/EstateManagementUI/.codeql-scratch/dbs/csharp/working/packages /p:DisableImplicitNuGetFallbackFolder=true --verbosity normal /p:TargetFrameworkRootPath=/home/REDACTED/work/EstateManagementUI/.codeql-scratch/dbs/csharp/working/emptyFakeDotnetRoot /p:NetCoreTargetingPackRoot=/home/REDACTED/work/EstateManagementUI/.codeql-scratch/dbs/csharp/working/emptyFakeDotnetRoot /p:AllowMissingPrunePackageData=true (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)

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Improve Code Coverage on Merchants Index Page</issue_title>
<issue_description>Use the estate index page tests as a guide on how to find buttons and also verify navigation</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Improve Code Coverage on Merchants Index Page #722

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