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)"));