Fix: Clone materials on agent death to prevent transparency bugs on other agents

frontend/static/index.html

@@ -1954,6 +1954,10 @@ function initScene() {
           ac.scale.setScalar(ac.userData.deathTimer);
           ac.traverse(child => {
             if (child.material) {
+              if (!child.userData.materialCloned) {
+                child.material = child.material.clone();
+                child.userData.materialCloned = true;
+              }
               child.material.transparent = true;
               child.material.opacity = Math.min(child.material.opacity || 1.0, ac.userData.deathTimer);
             }