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/DashboardAuthenticator.cs

@@ -117,6 +117,8 @@ public sealed class DashboardAuthenticator(
         }
     }
 
+    /// <summary>Escapes special characters in LDAP filter strings.</summary>
+    /// <param name="value">The string value to escape.</param>
     internal static string EscapeLdapFilter(string value)
     {
         StringBuilder builder = new(value.Length);
@@ -141,6 +143,8 @@ public sealed class DashboardAuthenticator(
     /// multiple roles; Admin and Viewer are the only legal values. Returns
     /// an empty list when no group matches (caller rejects the login).
     /// </summary>
+    /// <param name="groups">The collection of LDAP groups the user belongs to.</param>
+    /// <param name="groupToRole">The mapping from group names to dashboard role names.</param>
     internal static IReadOnlyList<string> MapGroupsToRoles(
         IEnumerable<string> groups,
         IReadOnlyDictionary<string, string> groupToRole)
@@ -171,6 +175,8 @@ public sealed class DashboardAuthenticator(
         return [.. roles];
     }
 
+    /// <summary>Extracts the first RDN value from a distinguished name.</summary>
+    /// <param name="distinguishedName">The LDAP distinguished name.</param>
     internal static string ExtractFirstRdnValue(string distinguishedName)
     {
         int equalsIndex = distinguishedName.IndexOf('=');