After a release the old hashed chunks are deleted, so an open tab from
the previous build failed its next lazy-page import until a manual
refresh. Three-part fix per the Vite deploy guide:
- vite:preloadError listener reloads the page once (10s sessionStorage
guard against loops) so stale tabs heal themselves
- static cache headers: /assets/* immutable for a year (content-hashed
names), index.html no-cache so new visits always see fresh chunk refs
- missing /assets/* now 404 instead of getting the SPA index.html
fallback (HTML-as-JS masked the failure)
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
