Auth Sign In Double Submit Double Submit Fires Once
EPIC:
auth
Authentication
STORY:
sign_in_double_submit
As a household member, tapping sign-in twice while it is submitting fires the request once and shows the loading state.
AC:
double_submit_fires_once
A second submit while the first is in flight is a no-op: exactly one AuthSignInRequested, button loading, still on the sign-in page.
Welcome (signed out)
Expect:
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tap Sign in → the form; enter credentials
User Actions:
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tap submit TWICE while the sign-in is gated → one request, loading state holds
User Actions:
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