Fixes [Sentry 7604159654](https://sentry.io/issues/7604159654/)
(v2.20.0, Mobile Safari). The onboarding router preloads 7 lazy chunks
on entry; Vite's CSS preload for SyncEmails rejected and three defects
compounded:
- `void SomePage.preload()` discarded the promise, so it became an
unhandled rejection and the user got a raw `Unable to preload CSS for
/assets/...css` snackbar.
- `lazyWithPreload` cached the *rejected* promise and rendered via
`throw preload()`. React pings on the rejection, re-renders, the
component throws the same settled rejected thenable, the ping listener
de-dupes, and the route hangs on its loader forever.
- `checkIfItsAViteStaleChunkLazyLoadingError` only matched Chrome's
message, so `AppErrorBoundary`'s reload recovery never fired for the
CSS-preload or Safari variants.
`lazyWithPreload` now records the failure in state instead of
rethrowing, so the thenable thrown into Suspense always fulfills,
`preload()` returns void and can never reject, and the render path
throws the real `Error` to the boundary, which reloads.
Two things worth knowing for review: `React.lazy` is not a substitute
here (its initializer has no synchronous fast path, so it suspends even
when the module is already loaded, reintroducing the loader flash #22392
removed), and the failure is deliberately sticky because Vite marks the
dep `seen` before attempting it, so an in-document retry loads the JS
without its CSS and silently renders an unstyled page.
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Raphaël Bosi
3c48e27b2e
