feat: integrate VolumeEditor initialization with 3D scene

- Initialize VolumeEditor module in initScene() override
- Pass scene, camera, controls, and renderer to VolumeEditor.init()
- Enables 3D trigger volume drawing and visualization
- Completes spatial automation trigger volume builder implementation

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

dashboard/js/app.js

@@ -1995,6 +1995,11 @@
             window.Fresnel.init(scene);
         }
 
+        // Initialize VolumeEditor with scene, camera, controls, renderer
+        if (window.VolumeEditor && window.VolumeEditor.init) {
+            window.VolumeEditor.init(scene, camera, controls, renderer);
+        }
+
         // Add event listeners for Fresnel interaction
         renderer.domElement.addEventListener('mousemove', onFresnelMouseMove);
         renderer.domElement.addEventListener('click', onFresnelClick);