fix(snippet): set first fragment when creating a snippet (#256)

Author: antonreshetov

src/renderer/composable/index.ts

@@ -19,6 +19,9 @@ export const onAddNewSnippet = async () => {
   const folderStore = useFolderStore()
   const snippetStore = useSnippetStore()
 
+  snippetStore.fragment = 0
+  snippetStore.isMarkdownPreview = false
+
   await snippetStore.addNewSnippet()
 
   if (folderStore.selectedId) {