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.UI.Abstractions.Tests/Input/KeyBindingsJsonTests.cs

@@ -258,6 +258,37 @@ public class KeyBindingsJsonTests
         }
     }
 
+    [Fact]
+    public void LoadOrDefault_migratesV4SelectRightPressBindingToClick()
+    {
+        var path = TempFile();
+        try
+        {
+            const string json = """
+                {
+                  "version": 4,
+                  "actions": {
+                    "SelectRight": [
+                      { "key": "-1002", "device": 1 }
+                    ]
+                  }
+                }
+                """;
+            File.WriteAllText(path, json);
+
+            var loaded = KeyBindings.LoadOrDefault(path);
+            Binding binding = Assert.Single(
+                loaded.ForAction(InputAction.SelectRight));
+
+            Assert.Equal((Key)(-1002), binding.Chord.Key);
+            Assert.Equal(ActivationType.Click, binding.Activation);
+        }
+        finally
+        {
+            if (File.Exists(path)) File.Delete(path);
+        }
+    }
+
     [Fact]
     public void LoadOrDefault_unknown_action_name_skipped_silently()
     {