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.Server/Dashboard/Hubs/AlarmsHub.cs

@@ -17,6 +17,7 @@ public sealed class AlarmsHub : Hub
     /// <summary>Method name used to push <c>AlarmFeedMessage</c> values to clients.</summary>
     public const string AlarmMessage = "AlarmFeed";
 
+    /// <inheritdoc />
     public override async Task OnConnectedAsync()
     {
         await Groups.AddToGroupAsync(Context.ConnectionId, AllAlarmsGroup).ConfigureAwait(false);