feat: Add casting capability to user_agent condition (#2480)

src/utils/casting.ts

@@ -1,7 +1,6 @@
 /**
  * Determine if the card is currently being casted.
- * @returns
  */
-export const isBeingCasted = (): boolean => {
-  return !!navigator.userAgent.match(/CrKey\//);
+export const isBeingCasted = (userAgent: string = navigator.userAgent): boolean => {
+  return !!userAgent.match(/CrKey\//);
 };