Picking a source starts the sign-in: the row collapses to the answer, the card opens where the credential link was, and the footer button walks Sign in -> Waiting for code -> Connecting before the step advances. Back unwinds it a beat at a time.
Nothing mounts to change layout - the card and the link are always rendered and their heights animate, with inert holding the a11y line - because a mount changes the page in one frame and no easing can smooth a step already taken.
Review fixes in the same branch: the displayed-code panel now reports its prompt upward (the OpenAI path could not leave the loading beat without it), the two-second hold is a cancellable beat rather than a dropped timer, unwinding a sequence that never opened a card no longer starts a login to cancel it, and the key field regains focus-on-open.
Connect starts the sign-in; the card that appears is the sign-in rather
than an offer of one; success advances to Review rather than reporting
itself. The two logins end in different places and the button says which:
Claude submits a code back here, so it spins on "Connecting"; OpenAI
finishes in another tab, so it stays a still, disabled Next until the
poll lands.
AdapterLoginPanel grows autoStart / onCancel / onConnected / chrome
rather than a second implementation — the session start, both polls, the
server deadline, the one-shot completion read and the unmount release are
the parts onboarding needs unchanged. Every prop is off by default, so
the agent form and the new-agent page render what they did before.
Claude's code auto-submits on the paste, not on every change:
isValidBrowserCode accepts any printable ASCII from one character up, so
a value-driven submit fired on the first keystroke of anyone who typed.
Also orders the OpenAI card and the settings displayed-code panel
code-above-link, with the instruction worded to match, and releases the
displayed-code session on unmount so an abandoned login stops holding the
one-per-owner reservation.
Tonio