Fix smoke gaps: recorder target + VK translation, player enum + null guard (#11)

tests/Recordingtest.Player.Tests/PlayerEngineTests.cs

@@ -153,6 +153,66 @@ baselines:
         Assert.Single(s.Baselines);
     }
 
+    [Fact]
+    public void PlayerEngine_NullTarget_SkipsWithoutCalling()
+    {
+        var engine = new PlayerEngine();
+        var host = new FakePlayerHost();
+        var scenario = new Scenario
+        {
+            Steps =
+            {
+                new Step { Kind = StepKind.Click, Target = null },
+                new Step { Kind = StepKind.Drag, Target = null },
+                new Step { Kind = StepKind.Type, Target = null, Value = "hello" },
+            },
+        };
+
+        engine.Run(scenario, host);
+
+        Assert.Empty(host.Clicks);
+        Assert.Empty(host.Drags);
+        Assert.Empty(host.Types);
+        Assert.Empty(host.Failures);
+    }
+
+    [Fact]
+    public void PlayerEngine_WheelKind_DoesNotThrow()
+    {
+        var engine = new PlayerEngine();
+        var host = new FakePlayerHost();
+        var scenario = new Scenario
+        {
+            Steps =
+            {
+                new Step { Kind = StepKind.Wheel, Value = "-120" },
+                new Step { Kind = StepKind.Focus },
+            },
+        };
+
+        engine.Run(scenario, host);
+        Assert.Empty(host.Failures);
+    }
+
+    [Fact]
+    public void ScenarioLoader_ParsesWheelAndFocusKinds()
+    {
+        const string yaml = """
+name: wheel-focus
+steps:
+  - kind: wheel
+    value: "-120"
+  - kind: focus
+    target:
+      uia_path: "Window/Edit"
+      offset: [0.5, 0.5]
+""";
+        var s = ScenarioLoader.LoadFromString(yaml);
+        Assert.Equal(2, s.Steps.Count);
+        Assert.Equal(StepKind.Wheel, s.Steps[0].Kind);
+        Assert.Equal(StepKind.Focus, s.Steps[1].Kind);
+    }
+
     private static string LocateEngineSource([CallerFilePath] string here = "")
     {
         // here = .../tests/Recordingtest.Player.Tests/PlayerEngineTests.cs