message: feat(theme): improve navbarLayout
diff: @@ -96,19 +96,19 @@ export default defineComponent({
  },
  }),
  slots["startBefore"]?.(),
  - ...navbarLayout.value.start.map((item) => map[item]),
  + ...(navbarLayout.value.start || []).map((item) => map[item]),
  slots["startAfter"]?.(),
  ]),
  h("div", { class: "navbar-center" }, [
  slots["centerBefore"]?.(),
  - ...navbarLayout.value.center.map((item) => map[item]),
  + ...(navbarLayout.value.center || []).map((item) => map[item]),
  slots["centerAfter"]?.(),
  ]),
  h("div", { class: "navbar-end" }, [
  slots["endBegin"]?.(),
  - ...navbarLayout.value.end.map((item) => map[item]),
  + ...(navbarLayout.value.end || []).map((item) => map[item]),
  slots["endAfter"]?.(),
  h(ToggleNavbarButton, {
  