fix skill

src/VrmCharacter.jsx

@@ -73,6 +73,14 @@ export default function VrmCharacter({ selectedAnimation: animState, vrmModel =
     const vrm = gltf.userData.vrm;
     vrmRef.current = vrm;
     VRMUtils.removeUnnecessaryJoints(vrm.scene);
+    // SpringBone: centerをRotatingStage(親group)に設定し、回転に追従させる
+    const sbm = vrm.springBoneManager;
+    if (sbm) {
+      const stageGroup = vrm.scene.parent;
+      sbm.joints?.forEach(joint => {
+        if (stageGroup) joint.center = stageGroup;
+      });
+    }
     vrm.humanoid.resetPose();
     vrm.scene.rotation.y = Math.PI;