Symptom: in the long-running dev server some lazy routes (/settings, /stash,
/collections, /stats) hit the route error boundary ('This page slammed') while
others worked. Console: 'Failed to fetch dynamically imported module'; network:
504 for node_modules/.vite/deps/*.js. Vite's dep-optimizer cache had gone
missing after the server re-optimized on a lockfile change, leaving stale ?v=
hashes.
- Add lazyWithRetry: on a chunk-load failure, retry once, then do a single
full reload per session (avoids reload loops); clears the flag on success
- Use it for all 53 lazy routes in AppRouter
- Document the dev dep-cache gotcha + fix in AGENTS.md
