fix(adminui): say why a Sparkplug array/unsupported metric cannot be committed (G2-F2)

Since R06:M-5 the Sparkplug browser states no address for a metric the
ingestor will not read and labels its descriptor 'not bindable', but the commit
refusal still said the attribute lookup returned nothing. RawBrowseModal keeps
the attribute's descriptor on the selection, and DescribeUncommittableLeaf
reports a 'cannot be bound in this version' message echoing it. A lookup that
really returned nothing keeps the old text. A test pins the marker to the
browser's own string.

Refs #745
Claude-Session: https://claude.ai/code/session_01Ub9hGmYLQvn9XETzw7CMsT

src/Server/ZB.MOM.WW.OtOpcUa.AdminUI/Components/Shared/Raw/RawBrowseModal.razor

@@ -503,6 +503,7 @@
         string name = sel.Leaf.DisplayName;
         string? driverDataType = null;
         IReadOnlyDictionary<string, string>? addressFields = null;
+        string? descriptor = null;
         try
         {
             var attrs = await BrowserService.AttributesAsync(_token, nodeId, default);
@@ -514,6 +515,8 @@
                 // reconstructed from the node id: a metric name may contain '/', so the id cannot be
                 // split back into (group, edgeNode, device?, metric) — see RawBrowseCommitMapper.
                 addressFields = attrs[0].AddressFields;
+                // The descriptor line, so a commit refusal can say WHY a leaf is unbindable (G2-F2).
+                descriptor = attrs[0].SecurityClass;
             }
         }
         catch
@@ -523,7 +526,7 @@
         }
 
         _selectedIds.Add(nodeId);
-        _selected[nodeId] = new SelectedLeaf(nodeId, name, driverDataType, sel.FolderPath, addressFields);
+        _selected[nodeId] = new SelectedLeaf(nodeId, name, driverDataType, sel.FolderPath, addressFields, descriptor);
 
         // A metric is also a legal rebirth scope (it resolves up to its owning edge node), so a toggle
         // moves the scope the same way a folder click does.
@@ -768,7 +771,7 @@
             // committing it would produce a tag that deploys clean and then reports BadNodeIdUnknown
             // forever with nothing to point at.
             _commitErrors = _selected.Values
-                .Select(s => RawBrowseCommitMapper.DescribeUncommittableLeaf(_driverType, s.Name, s.AddressFields))
+                .Select(s => RawBrowseCommitMapper.DescribeUncommittableLeaf(_driverType, s.Name, s.AddressFields, s.Descriptor))
                 .Where(e => e is not null)
                 .Select(e => e!)
                 .ToList();
@@ -843,7 +846,8 @@
         string Name,
         string? DriverDataType,
         IReadOnlyList<string> FolderPath,
-        IReadOnlyDictionary<string, string>? AddressFields = null);
+        IReadOnlyDictionary<string, string>? AddressFields = null,
+        string? Descriptor = null);
 
     /// <summary>A described Request-rebirth scope: what gets published, and to what.</summary>
     /// <param name="Scope">The browse node id handed to the session verbatim.</param>