Improve test coverage for Merchants View Page

[Copilot]

Expands MerchantsViewPageTests from 4 to 21 tests following patterns established in EstateIndexPageTests.

Changes

• Tab navigation (6 tests): Verify switching between all 8 tabs (details, address, contact, operators, contracts, devices, transactions, settlements)
• Data display (6 tests): Test operators, contracts, and devices with data present and empty states
• Detailed views (3 tests): Validate merchant details, address, and contact information rendering
• Error handling (2 tests): Navigation on load failure and back button behavior

Test Pattern

Uses button finding and navigation verification as demonstrated in Estate Index tests:

// Find button by text content
IRefreshableElementCollection<IElement> buttons = cut.FindAll("button");
IElement? operatorsButton = buttons.FirstOrDefault(b => b.TextContent.Contains("Assigned Operators"));
operatorsButton?.Click();

// Verify navigation
cut.WaitForAssertion(() => cut.Markup.ShouldContain("No operators assigned"), timeout: TimeSpan.FromSeconds(5));

Helper methods added for test data setup to reduce duplication across tests.

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~MerchantsViewPageTests --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

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This section details on the original issue you should resolve

<issue_title>Improve Code Coverage on Merchants View 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 View Page #724

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