Toaster 自身的 Toast 状态在使用 Toast() 方法写入时与根应用的顶级 await (包含 Suspense) 不同步

const ol = document.querySelector('ol[data-slot="viewport"]');
let cur = ol.__vueParentComponent;
while (cur) {
  if (cur.setupState?.toasts !== undefined) {
    console.log(cur.type?.name, cur.setupState.toasts.value ?? cur.setupState.toasts);
    break;
  }
  cur = cur.parent;
// → "Toaster" []
}
...while a separate `useToast()` call in the same page (in `onMounted`, guaranteed no timing/inject warnings) shows the pushed item present in `toasts.value` the whole time. Two `useToast()` call sites that should share one `useState('toasts', ...)` instance are desynced — the write succeeds, the read (inside `Toaster`'s own setup) never sees it.
**Suspected trigger:** our root `app.vue` has a **top-level `await`** before `<UApp>` mounts (fetching page data needed for SEO/branding), making `app.vue` itself an async component that Nuxt wraps in a `<Suspense>` boundary. I strongly suspect this is what desyncs `Toaster`'s `useState('toasts')` binding from the rest of the app's calls — this matches a known class of Vue/Nuxt bug where nested async-`setup()` components under `<Suspense>` can end up with inconsistent `getCurrentInstance()`/injection context after resolution, but I did not have time to build a minimal isolated repro removing our app's other complexity to nail down whether the top-level await is necessary and sufficient.
Separately (and already fixed on our end, not what this issue is about): a component that calls `useToast()` (via a wrapper composable) *after* its own top-level `await` reliably logs `[Vue warn]: inject() can only be used inside setup() or functional components` — consistent with the known async-setup/lifecycle-timing footgun, and probably a contributing factor but not the sole cause, since the empty-`Toaster`-state repro above happens even with a `useToast()` call site that has *zero* Vue warnings (top of a fresh page's `onMounted`).
Related issues I found that circle similar territory but don't exactly match this (no top-level-await/Suspense angle, no resolution reached in either):
- https://GitHub.com/nuxt/ui/issues/3564 ("Toast not showing", `UApp` correctly wrapping, closed with no resolution)
- https://GitHub.com/nuxt/ui/issues/1477 (`useToast()` before `navigateTo()`,
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