fix(adminui): alias update pins invariants + LoadAliasTagAsync + null-driver guard (review)

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

@@ -288,6 +288,8 @@ public sealed class UnsTreeServiceAliasTagTests
         doc.RootElement.GetProperty("FullName").GetString().ShouldBe("TestMachine_020.Speed");
         tag.TagConfig.ShouldContain("FullName");
         tag.TagConfig.ShouldContain("TestMachine_020.Speed");
+        tag.WriteIdempotent.ShouldBeFalse();
+        tag.PollGroupId.ShouldBeNull();
     }
 
     /// <summary>An empty/whitespace Galaxy reference is rejected before anything is written.</summary>
@@ -364,6 +366,44 @@ public sealed class UnsTreeServiceAliasTagTests
         result.Error!.ShouldContain("speed-alias");
     }
 
+    /// <summary>
+    /// <see cref="UnsTreeService.LoadAliasTagAsync"/> returns a DTO whose <c>FullName</c> matches the
+    /// TagConfig and whose <c>RowVersion</c> is non-empty.
+    /// </summary>
+    [Fact]
+    public async Task LoadAliasTag_returns_dto_with_FullName()
+    {
+        var dbName = SeedCluster();
+
+        using (var db = UnsTreeTestDb.CreateNamed(dbName))
+        {
+            db.Tags.Add(new Tag
+            {
+                TagId = "TAG-LOAD-ALIAS",
+                DriverInstanceId = GatewayDriverId,
+                EquipmentId = EquipmentId,
+                Name = "loaded-speed",
+                DataType = "Float",
+                AccessLevel = TagAccessLevel.ReadWrite,
+                TagConfig = "{\"FullName\":\"TestMachine_020.LoadedSpeed\"}",
+            });
+            db.SaveChanges();
+        }
+
+        var service = new UnsTreeService(UnsTreeTestDb.Factory(dbName));
+
+        var dto = await service.LoadAliasTagAsync("TAG-LOAD-ALIAS");
+
+        dto.ShouldNotBeNull();
+        dto!.TagId.ShouldBe("TAG-LOAD-ALIAS");
+        dto.Name.ShouldBe("loaded-speed");
+        dto.DriverInstanceId.ShouldBe(GatewayDriverId);
+        dto.DataType.ShouldBe("Float");
+        dto.AccessLevel.ShouldBe(TagAccessLevel.ReadWrite);
+        dto.FullName.ShouldBe("TestMachine_020.LoadedSpeed");
+        dto.RowVersion.ShouldNotBeNull();
+    }
+
     /// <summary>
     /// Update changes the alias's name, data type, access level, and Galaxy reference, returning Ok and
     /// persisting the new values and the refreshed <c>{"FullName":…}</c> TagConfig.