I suspect HMR does not working properly on dev because we have multiple entries.
One relative issue: https://github.com/webpack/webpack-dev-server/issues/2792/
I think we do not need multiple entries for polyfills & plugins after all. They could be in the same chunk, and could be later optimized through splitChunks option.
`ses.ts` is changed to `ses-lockdown.ts` because `ses.ts` does not pass circular dependency check by madge. I haven't looked through the real root cause though. See https://github.com/pahen/madge/issues/355
If network offline or API error happens, the `session` returned by the `useSession` hook will be null, so we can't assume it is not null.
There should be following changes:
1. create a page in ErrorBoundary to let the user refetch the session.
2. The `SessionProvider` stop to pull the new session once the session is null, we need to figure out a way to pull the new session when the network is back or the user click the refetch button.
