fix: export highlighter function and rename in composable

composables/shiki.ts

@@ -5,7 +5,7 @@ const shiki = ref<Highlighter>()
 const registeredLang = ref(new Map<string, boolean>())
 let shikiImport: Promise<void> | undefined
 
-function useHighlighter(lang: Lang) {
+export function useHighlighter(lang: Lang) {
   if (!shikiImport) {
     shikiImport = import('shiki-es')
       .then(async (r) => {

composables/tiptap/shiki.ts

@@ -45,7 +45,7 @@ function getDecorations({
       let from = block.pos + 1
       const language = block.node.attrs.language
 
-      const shiki = useHightlighter(language)
+      const shiki = useHighlighter(language)
 
       if (!shiki)
         return