refactor: remove cn helper function from the editor package (#6217)

packages/utils/src/common.ts

@@ -0,0 +1,4 @@
+import { clsx, type ClassValue } from "clsx";
+import { twMerge } from "tailwind-merge";
+
+export const cn = (...inputs: ClassValue[]) => twMerge(clsx(inputs));

packages/utils/src/index.ts

@@ -1,3 +1,4 @@
 export * from "./color";
+export * from "./common";
 export * from "./emoji";
 export * from "./string";