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.Tests/Contracts/ProtobufContractRoundTripTests.cs

@@ -667,6 +667,7 @@ public sealed class ProtobufContractRoundTripTests
     ///     Verifies that a DiscoverHierarchyRequest round-trips through every
     ///     <c>root</c> oneof arm and its proto wrapper-typed <c>max_depth</c> field.
     /// </summary>
+    /// <param name="rootArm">The oneof arm selector (0=RootGobjectId, 1=RootTagName, 2=RootContainedPath).</param>
     [Theory]
     [InlineData(0)]
     [InlineData(1)]
@@ -1165,6 +1166,8 @@ public sealed class ProtobufContractRoundTripTests
     ///     expected value. Pins every new oneof case added by the bulk
     ///     write/read extension.
     /// </summary>
+    /// <param name="kind">The command kind to test.</param>
+    /// <param name="expectedPayloadCase">The expected payload oneof case.</param>
     [Theory]
     [InlineData(MxCommandKind.WriteBulk, MxCommandReply.PayloadOneofCase.WriteBulk)]
     [InlineData(MxCommandKind.Write2Bulk, MxCommandReply.PayloadOneofCase.Write2Bulk)]