Provider, address, sign-in, lists — plus a receipt naming what it set up,
and an errand step for the services that need an app password minted
first. Picking a provider advances on the tap; a service we cannot sync
with says so on its own row and sorts to the end.
System back now steps through the flow instead of closing it, which also
means onStartOver runs on every exit: no more reopening onto the last
server's picker, and no more poll loop outliving its screen.
Split out of one 569-line file into ui/accounts/add/.
makiolaj
04a7137403