fix: add missing imports for HeadingNode, QuoteNode, TRANSFORMERS in LexicalService

Author: Innei

apps/core/src/processors/helper/helper.lexical.service.ts

@@ -2,6 +2,8 @@ import { CodeHighlightNode, CodeNode } from '@lexical/code'
 import { createHeadlessEditor } from '@lexical/headless'
 import { AutoLinkNode, LinkNode } from '@lexical/link'
 import { ListItemNode, ListNode } from '@lexical/list'
+import { $convertToMarkdownString, TRANSFORMERS } from '@lexical/markdown'
+import { HeadingNode, QuoteNode } from '@lexical/rich-text'
 import { Injectable } from '@nestjs/common'
 import { ContentFormat } from '~/shared/types/content-format.type'
 import type { Klass, LexicalNode } from 'lexical'