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/MxAccess/AlarmCommandHandler.cs

@@ -41,12 +41,16 @@ public sealed class AlarmCommandHandler : IAlarmCommandHandler
     private AlarmDispatcher? dispatcher;
     private bool disposed;
 
+    /// <summary>Initializes a new alarm command handler with the given event queue.</summary>
+    /// <param name="eventQueue">The event queue.</param>
     public AlarmCommandHandler(MxAccessEventQueue eventQueue)
         : this(eventQueue, () => new WnWrapAlarmConsumer(), threadAffinityCheck: null)
     {
     }
 
     /// <summary>Test seam — inject a custom consumer factory.</summary>
+    /// <param name="eventQueue">The event queue.</param>
+    /// <param name="consumerFactory">The alarm consumer factory.</param>
     public AlarmCommandHandler(
         MxAccessEventQueue eventQueue,
         Func<IMxAccessAlarmConsumer> consumerFactory)
@@ -68,6 +72,9 @@ public sealed class AlarmCommandHandler : IAlarmCommandHandler
     ///     optional: tests that already drive the handler on a single
     ///     thread can pass <c>null</c>.
     /// </summary>
+    /// <param name="eventQueue">The event queue.</param>
+    /// <param name="consumerFactory">The alarm consumer factory.</param>
+    /// <param name="threadAffinityCheck">Optional thread affinity check action.</param>
     public AlarmCommandHandler(
         MxAccessEventQueue eventQueue,
         Func<IMxAccessAlarmConsumer> consumerFactory,
@@ -78,6 +85,7 @@ public sealed class AlarmCommandHandler : IAlarmCommandHandler
         this.threadAffinityCheck = threadAffinityCheck;
     }
 
+    /// <summary>Gets a value indicating whether the handler is subscribed.</summary>
     public bool IsSubscribed
     {
         get { lock (syncRoot) return dispatcher is not null; }