message: fix(theme): fix TOC headerDepth
diff: @@ -62,7 +62,9 @@ export default defineComponent({
  h(PageTitle),
  tocEnable.value
  ? h(resolveComponent("TOC"), {
  - headerDepth: frontmatter.value.headerDepth,
  + headerDepth:
  + frontmatter.value.headerDepth ??
  + themeLocale.value.headerDepth,
  })
  : null,
  slots.contentBefore?.(),
  