fix: empty heading crash on edit msg (#2929)

* fix crash when editing message with empty trailing heading

* remove unused imports

src/app/components/CallEmbedProvider.tsx

@@ -1,6 +1,5 @@
 import React, { ReactNode, useCallback, useRef } from 'react';
 import { useAtomValue, useSetAtom } from 'jotai';
-import { config } from 'folds';
 import {
   CallEmbedContextProvider,
   CallEmbedRefContextProvider,