refactor(adminui): trim inline-script label + null-case test + helper-proxy note

Code-review nits: trim the seed name so the in-session dropdown label matches
the server-trimmed persisted name; add a null-selectedId test for
ResolveScriptLabel; and note in CreateNewScriptAsync that the ordering
invariant is proxied by the pure helper (AdminUI has no bUnit).

src/Server/ZB.MOM.WW.OtOpcUa.AdminUI/Components/Shared/Uns/VirtualTagModal.razor

@@ -321,7 +321,10 @@
         _scriptCreateError = null;
         try
         {
-            var seedName = string.IsNullOrWhiteSpace(_form.Name) ? "New script" : $"{_form.Name} script";
+            // Trim so the local dropdown label matches what CreateScriptAsync persists (it Trim()s
+            // the name server-side) — otherwise stray whitespace makes the in-session label drift
+            // from every later modal open.
+            var seedName = string.IsNullOrWhiteSpace(_form.Name) ? "New script" : $"{_form.Name.Trim()} script";
             var result = await Svc.CreateScriptAsync(seedName);
             if (!result.Ok || string.IsNullOrEmpty(result.CreatedId))
             {
@@ -331,7 +334,9 @@
 
             // Add the new script to the options list BEFORE setting the selected value so the
             // <InputSelect> can resolve the label on first render — if we set ScriptId first the
-            // dropdown has no matching <option> yet and shows a blank/stale label.
+            // dropdown has no matching <option> yet and shows a blank/stale label. This ordering
+            // invariant is unit-tested via VirtualTagModalHelpers.ResolveScriptLabel (the AdminUI
+            // has no bUnit harness, so the pure helper proxies the render-cycle contract).
             if (!_scripts.Any(s => s.Id == result.CreatedId))
             {
                 _scripts.Add((result.CreatedId, $"{seedName} (CSharp)"));

tests/Server/ZB.MOM.WW.OtOpcUa.AdminUI.Tests/Uns/VirtualTagScriptDropdownTests.cs

@@ -59,6 +59,20 @@ public sealed class VirtualTagScriptDropdownTests
         label.ShouldBeNull();
     }
 
+    [Fact]
+    public void ResolveScriptLabel_ReturnsNull_WhenSelectedIdIsNull()
+    {
+        // The helper parameter is string? — a null selection resolves to no label, not a throw.
+        var options = new List<(string Id, string Display)>
+        {
+            ("SC-existing001", "OldScript (CSharp)"),
+        };
+
+        var label = VirtualTagModalHelpers.ResolveScriptLabel(options, null);
+
+        label.ShouldBeNull();
+    }
+
     [Fact]
     public void ResolveScriptLabel_ReturnsNull_WhenOptionsIsEmpty()
     {