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/Gateway/Grpc/GalaxyRepositoryGrpcServiceTests.cs

@@ -11,6 +11,7 @@ namespace ZB.MOM.WW.MxGateway.Tests.Gateway.Grpc;
 
 public sealed class GalaxyRepositoryGrpcServiceTests
 {
+    /// <summary>Verifies that DiscoverHierarchy returns the requested page and totals.</summary>
     [Fact]
     public async Task DiscoverHierarchy_ReturnsRequestedPageAndTotals()
     {
@@ -31,6 +32,7 @@ public sealed class GalaxyRepositoryGrpcServiceTests
         Assert.Equal(3, reply.TotalObjectCount);
     }
 
+    /// <summary>Verifies that DiscoverHierarchy with a page token returns remaining objects.</summary>
     [Fact]
     public async Task DiscoverHierarchy_WithNextPageToken_ReturnsRemainingObjects()
     {
@@ -56,6 +58,9 @@ public sealed class GalaxyRepositoryGrpcServiceTests
         Assert.Equal(3, reply.TotalObjectCount);
     }
 
+    /// <summary>Verifies that DiscoverHierarchy with invalid paging arguments returns InvalidArgument.</summary>
+    /// <param name="pageToken">The page token to test.</param>
+    /// <param name="pageSize">The page size to test.</param>
     [Theory]
     [InlineData("-1", 1)]
     [InlineData("not-an-offset", 1)]
@@ -80,6 +85,7 @@ public sealed class GalaxyRepositoryGrpcServiceTests
         Assert.Equal(StatusCode.InvalidArgument, exception.StatusCode);
     }
 
+    /// <summary>Verifies that DiscoverHierarchy with subtree root and depth filters descendants.</summary>
     [Fact]
     public async Task DiscoverHierarchy_WithSubtreeRootAndDepth_FiltersDescendants()
     {
@@ -98,6 +104,7 @@ public sealed class GalaxyRepositoryGrpcServiceTests
         Assert.Equal(3, reply.TotalObjectCount);
     }
 
+    /// <summary>Verifies that DiscoverHierarchy applies server-side filters and omits attributes.</summary>
     [Fact]
     public async Task DiscoverHierarchy_WithServerSideFilters_AppliesAllFiltersAndOmitsAttributes()
     {
@@ -123,6 +130,7 @@ public sealed class GalaxyRepositoryGrpcServiceTests
         Assert.Equal(1, reply.TotalObjectCount);
     }
 
+    /// <summary>Verifies that DiscoverHierarchy with filtered paging returns post-filter total.</summary>
     [Fact]
     public async Task DiscoverHierarchy_WithFilteredPaging_ReturnsPostFilterTotal()
     {
@@ -154,6 +162,7 @@ public sealed class GalaxyRepositoryGrpcServiceTests
         Assert.NotEqual(firstObject.TagName, secondObject.TagName);
     }
 
+    /// <summary>Verifies that DiscoverHierarchy with mismatched filter token returns InvalidArgument.</summary>
     [Fact]
     public async Task DiscoverHierarchy_WithMismatchedFilterToken_ReturnsInvalidArgument()
     {
@@ -180,6 +189,7 @@ public sealed class GalaxyRepositoryGrpcServiceTests
         Assert.Contains("filters", exception.Status.Detail, StringComparison.OrdinalIgnoreCase);
     }
 
+    /// <summary>Verifies that DiscoverHierarchy with missing root returns NotFound.</summary>
     [Fact]
     public async Task DiscoverHierarchy_WithMissingRoot_ReturnsNotFound()
     {
@@ -315,10 +325,13 @@ public sealed class GalaxyRepositoryGrpcServiceTests
 
     private sealed class StubGalaxyHierarchyCache(GalaxyHierarchyCacheEntry current) : IGalaxyHierarchyCache
     {
+        /// <inheritdoc />
         public GalaxyHierarchyCacheEntry Current { get; } = current;
 
+        /// <inheritdoc />
         public Task RefreshAsync(CancellationToken cancellationToken) => Task.CompletedTask;
 
+        /// <inheritdoc />
         public Task WaitForFirstLoadAsync(CancellationToken cancellationToken) => Task.CompletedTask;
     }