Add a connect step between persona selection and Stripe checkout: persona ->
connect >=1 network (server-enforced) -> checkout. Extract the network grid into
a shared NetworkConnectGrid used by both onboarding and the accounts page, which
is redesigned from a table into the same grid (one account per network, with
per-card connect / connected+disconnect / reconnect states). Drop the openDialog
auto-open flow now that networks are shown inline.
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