Add distance-based scaling to ResizeGizmo handles

- Implement camera distance-based scaling so handles appear consistent visual size
- Add updateHandleScaling() method called every frame
- Use 0.2 multiplier for scale factor (adjustable)
- Handles maintain mesh rotation alignment (not billboarded)
- Keeps existing utility layer configuration for compatibility

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

src/gizmos/ResizeGizmo/ResizeGizmo.ts

@@ -184,6 +184,9 @@ export class ResizeGizmo {
             // Check for handle picking with XR controllers
             this.checkXRControllerPicking();
 
+            // Update handle scaling based on camera distance
+            this.updateHandleScaling();
+
             // Update scaling if active
             if (this._isScaling) {
                 this.updateScaling();
@@ -194,6 +197,20 @@ export class ResizeGizmo {
         });
     }
 
+    /**
+     * Update handle scaling based on camera distance for consistent visual size
+     */
+    private updateHandleScaling(): void {
+        const camera = this._scene.activeCamera;
+        if (!camera) return;
+
+        for (const handle of this._handles) {
+            const distance = Vector3.Distance(camera.globalPosition, handle.position);
+            const scaleFactor = distance * 0.2; // Adjust multiplier to control visual size
+            handle.scaling = new Vector3(scaleFactor, scaleFactor, scaleFactor);
+        }
+    }
+
     /**
      * Check if XR controllers are pointing at any handles
      */