feat(editor): 用 CodeBlockLowlight 替换 StarterKit 自带 CodeBlock

禁用 StarterKit codeBlock,引入 CodeBlockLowlight + lowlight 实例。
代码块现在有实时语法高亮(ProseMirror decoration),language 属性
仍承载完整 info string(markdown 往返不变)。

libs/tiptap-editor/src/index.ts

@@ -3,7 +3,9 @@ import { FileHandler } from '@tiptap/extension-file-handler';
 import { TaskItem, TaskList } from '@tiptap/extension-list';
 import { TableKit } from '@tiptap/extension-table';
 import { Markdown } from '@tiptap/markdown';
+import CodeBlockLowlight from '@tiptap/extension-code-block-lowlight';
 import StarterKit from '@tiptap/starter-kit';
+import { lowlight } from './highlight';
 import { SlashCommand } from './slash-command';
 import { TaskInputRule } from './task-input-rule';
 import {
@@ -98,8 +100,10 @@ class TiptapEditorInstance {
             linkOnPaste: true,
             HTMLAttributes: { rel: 'noopener noreferrer', target: '_blank' },
           },
+          codeBlock: false,
         }),
         Markdown,
+        CodeBlockLowlight.configure({ lowlight }),
         TableKit,
         UploadImage,
         TaskList,