use a better cloning algorithm

src/element/newElement.ts

@@ -5,6 +5,7 @@ import { Point } from "roughjs/bin/geometry";
 
 import { ExcalidrawElement, ExcalidrawTextElement } from "../element/types";
 import { measureText } from "../utils";
+import klona from "klona";
 
 export function newElement(
   type: string,
@@ -63,15 +64,7 @@ export function newTextElement(
 }
 
 export function duplicateElement(element: ReturnType<typeof newElement>) {
-  const copy = {
-    ...element,
-  };
-  if ("points" in copy) {
-    copy.points = Array.isArray(element.points)
-      ? JSON.parse(JSON.stringify(element.points))
-      : element.points;
-  }
-
+  const copy = klona(element);
   delete copy.shape;
   copy.id = nanoid();
   copy.seed = randomSeed();