Fix/MFA authentication

[ClaudioESSilva]

What does this PR do?

Fixes #297

🤖 says:

Root cause: Microsoft.Data.SqlClient 7.0.0 introduced a breaking change — it extracted all Entra ID / Azure Active Directory authentication code into a separate package (Microsoft.Data.SqlClient.Extensions.Azure). Without it, attempting to use ActiveDirectoryInteractive (Entra MFA) throws the error you saw.

Fix applied: Added Microsoft.Data.SqlClient.Extensions.Azure (v1.0.0) to PlanViewer.Core.csproj. This package contains ActiveDirectoryAuthenticationProvider and all related Entra/Azure auth types that were removed from the core Microsoft.Data.SqlClient package. No code changes were required — just the missing dependency.

Which component(s) does this affect?

• Desktop App (PlanViewer.App)
• Core Library (PlanViewer.Core)
• CLI Tool (PlanViewer.Cli)
• SSMS Extension (PlanViewer.Ssms)
• Tests
• Documentation

How was this tested?

Tested to connect and succeeded

Checklist

• I have read the contributing guide
• My code builds with zero warnings (dotnet build -c Debug)
• All tests pass (dotnet test)
• I have not introduced any hardcoded credentials or server names

[erikdarlingdata]

LGTM. Diagnosis matches the SqlClient 7.0.0 release notes — Entra/Azure auth was extracted into Microsoft.Data.SqlClient.Extensions.Azure, and adding the package reference is the documented migration. Confirmed the package on NuGet (Microsoft-published, 1.0.0, released 2026-03-17).

Removing the 80-char truncation is a quiet bonus fix — that line was hiding the actionable part of the new error messages, since SqlClient 7.0.0 specifically rewrote them to tell users which package to install. Pre-fix, the message was being chopped to Cannot find an authentication provider for 'ActiveDirectory...', which is exactly what burned the reporter.

The companion XAML change (horizontal → vertical, TextWrapping="Wrap", button HorizontalAlignment="Left") is the right shape for now-untruncated multi-line errors.

One tradeoff worth naming, not a blocker: this re-introduces Azure.Identity / Azure.Core / MSAL transitively for every user of PlanViewer.Core, even ones who only connect to on-prem SQL with Windows auth — exactly the footprint SqlClient 7.0.0 was designed to make optional. The alternative (an opt-in PlanViewer.Core.Azure package) is over-engineering for this tool. Accept the cost.

Two non-blocking nits:

• Spacing dropped 6 → 8 in the test-status row would better match the rhythm of the other rows in the dialog (Margin="0,0,0,12", Spacing="16").
• "Core Library (PlanViewer.Core)" component checkbox in the PR description should also be ticked since PlanViewer.Core.csproj is where the dep landed. Cosmetic.

Neither is worth holding the PR for.