fix: 修复 cliHighlight 类型不兼容问题

loadedGetLanguage 返回类型中 name 字段改为可选，匹配 highlight.js
Language 类型中 name 为 string | undefined 的定义。

Co-Authored-By: Claude Opus 4.7 <[email protected]>

Author: claude-code-best

src/utils/cliHighlight.ts

@@ -17,7 +17,7 @@ export type CliHighlight = {
 // One promise shared by Fallback.tsx, markdown.ts, events.ts, getLanguageName.
 let cliHighlightPromise: Promise<CliHighlight | null> | undefined
 
-let loadedGetLanguage: ((name: string) => { name: string } | undefined) | undefined
+let loadedGetLanguage: ((name: string) => { name?: string } | undefined) | undefined
 
 async function loadCliHighlight(): Promise<CliHighlight | null> {
   try {