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/Configuration/ProtocolOptions.cs

@@ -12,5 +12,6 @@ public sealed class ProtocolOptions
     /// </summary>
     public uint WorkerProtocolVersion { get; init; } = GatewayContractInfo.WorkerProtocolVersion;
 
+    /// <summary>Gets or sets the maximum gRPC message size in bytes.</summary>
     public int MaxGrpcMessageBytes { get; init; } = 16 * 1024 * 1024;
 }