docs+ui: backfill XML doc comments and finish dashboard layout pass

Adds missing <summary>/<param> XML docs across 99 server, worker, and test
files so CommentChecker reports zero issues (TreatWarningsAsErrors needs the
analyzer clean). Bundles in WIP dashboard work: NavSection extraction,
MainLayout/site.css/js styling alignment, and DashboardOptions/Auth tweaks.

src/ZB.MOM.WW.MxGateway.Worker.Tests/Probes/AlarmsLiveSmokeTests.cs

@@ -36,11 +36,14 @@ public sealed class AlarmsLiveSmokeTests
     private readonly Stopwatch elapsed = Stopwatch.StartNew();
     private readonly ConcurrentQueue<string> log = new ConcurrentQueue<string>();
 
+    /// <summary>Initializes a new instance of the AlarmsLiveSmokeTests class.</summary>
+    /// <param name="output">Test output helper for logging.</param>
     public AlarmsLiveSmokeTests(ITestOutputHelper output)
     {
         this.output = output;
     }
 
+    /// <summary>Verifies the alarm pipeline raises and acknowledges alarms correctly.</summary>
     [Fact(Skip = "Live dev-rig smoke test — flip Skip=null with AVEVA + the alarm flip script running. Verified working 2026-05-01.")]
     public void Alarms_FullPipelineRoundTrip_RaisesAndAcknowledges()
     {