syncToRecs should be not async

[holic]

We want to guarantee the returned streams haven't started yet and async reveals possible foot-guns

[holic]

Found another issue where our React template expect to await the network setup before rendering anything, but now the network setup fetches/hydrates from the indexer before returning, so the React app won't render anything until after the initial fetch.

This probably explains either the black or white screen in Sky Strife cc @Kooshaba @yonadaaa