feat(input): assess world objects on right click

Port SmartBox's release-completed sr_Examine gesture through the configurable SelectRight binding. Cancel camera drags at the shared retail three-pixel threshold, then reuse the canonical picker, selection pulse, and appraisal request path without inventing another wire or UI owner.

Co-authored-by: Codex <codex@openai.com>

tests/AcDream.App.Tests/Interaction/SelectionInteractionControllerTests.cs

@@ -223,6 +223,65 @@ public sealed class SelectionInteractionControllerTests
         Assert.Null(h.Selection.SelectedObjectId);
     }
 
+    [Fact]
+    public void RightClickPulsesSelectsAndExaminesPickedWorldObject()
+    {
+        var h = new Harness();
+        h.Query.Picked = Target;
+
+        Assert.True(h.Controller.HandleInputAction(InputAction.SelectRight));
+
+        Assert.False(h.Query.LastIncludeSelf);
+        Assert.Equal(Target, h.Selection.SelectedObjectId);
+        Assert.Equal(new[] { "pick", "pulse", "examine" }, h.Query.Events);
+        Assert.Equal(new[] { Target }, h.Examines);
+    }
+
+    [Fact]
+    public void RightClickEmptyWorldIsANoOp()
+    {
+        var h = new Harness();
+
+        Assert.True(h.Controller.HandleInputAction(InputAction.SelectRight));
+
+        Assert.Equal(new[] { "pick" }, h.Query.Events);
+        Assert.Null(h.Selection.SelectedObjectId);
+        Assert.Empty(h.Examines);
+        Assert.Empty(h.Toasts);
+    }
+
+    [Fact]
+    public void RightClickExaminesWithoutConsumingLeftClickTargetMode()
+    {
+        var h = new Harness();
+        h.Query.Picked = Target;
+        h.Items.InteractionState.EnterUse();
+
+        h.Controller.HandleInputAction(InputAction.SelectRight);
+
+        Assert.Equal(InteractionModeKind.Use, h.Items.InteractionState.Current.Kind);
+        Assert.Equal(Target, h.Selection.SelectedObjectId);
+        Assert.Equal(new[] { Target }, h.Examines);
+    }
+
+    [Fact]
+    public void ExamineActionUsesSelectionOrEntersTargetMode()
+    {
+        var selected = new Harness();
+        selected.Selection.Select(Target, SelectionChangeSource.World);
+
+        Assert.True(selected.Controller.HandleInputAction(
+            InputAction.SelectionExamine));
+        Assert.Equal(new[] { Target }, selected.Examines);
+
+        var empty = new Harness();
+        Assert.True(empty.Controller.HandleInputAction(
+            InputAction.SelectionExamine));
+        Assert.Equal(
+            InteractionModeKind.Examine,
+            empty.Items.InteractionState.Current.Kind);
+    }
+
     [Fact]
     public void ClosestTargetInputMutatesSelectionOnce()
     {