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/Galaxy/GalaxyHierarchyProjectorTests.cs

@@ -16,6 +16,7 @@ namespace ZB.MOM.WW.MxGateway.Tests.Galaxy;
 /// </summary>
 public sealed class GalaxyHierarchyProjectorTests
 {
+    /// <summary>Verifies that paging across a hierarchy returns every object exactly once.</summary>
     [Fact]
     public void Project_PagedAcrossEntireHierarchy_ReturnsEveryObjectExactlyOnce()
     {
@@ -43,6 +44,7 @@ public sealed class GalaxyHierarchyProjectorTests
         Assert.Equal("Object_025", collected[^1]);
     }
 
+    /// <summary>Verifies that distinct filters on the same entry do not share memoized view list.</summary>
     [Fact]
     public void Project_DistinctFiltersOnSameEntry_DoNotShareMemoizedViewList()
     {
@@ -60,6 +62,7 @@ public sealed class GalaxyHierarchyProjectorTests
         Assert.Equal(10, unfiltered.TotalObjectCount);
     }
 
+    /// <summary>Verifies that the same filter repeated returns identical totals.</summary>
     [Fact]
     public void Project_SameFilterRepeated_ReturnsIdenticalTotals()
     {
@@ -85,6 +88,7 @@ public sealed class GalaxyHierarchyProjectorTests
         Assert.NotEqual(first.Objects[0].TagName, second.Objects[0].TagName);
     }
 
+    /// <summary>Verifies that distinct cache entries project against their own data.</summary>
     [Fact]
     public void Project_DistinctCacheEntries_ProjectAgainstTheirOwnData()
     {