Michael Chihlas 39e85c9770 feat(auth): add /accept-invite page + lookup endpoint ...

Adds the invitee-side flow for self-serve signup Phase 2 (Task 36):

Backend
- Public GET /accounts/invites/{code}/lookup returns
  {account_name, inviter_name, invited_email, role} for a valid invite,
  404 invite_invalid_or_expired_or_revoked otherwise (collapses unknown /
  expired / revoked / used into one anti-enumeration response). Mounted
  in a new account_invite_lookup endpoints module on the public route
  list, uses get_admin_db (BYPASSRLS) since the caller has no tenant.
- OAuthCallbackPayload gains optional account_invite_code + invited_email.
  _sign_in_or_register honors them: a new OAuth user with a valid invite
  joins the invited account (no personal account, no Pro trial), the
  invite is marked used, and OAuth-profile-email vs invite-email mismatch
  raises invite_email_mismatch (matching the email+password register
  contract).

Frontend
- New public route /accept-invite -> AcceptInvitePage. Reads ?code=,
  calls inviteApi.lookupAccountInvite, renders "Join {account} on
  ResolutionFlow" with the invited email locked (rendered as a div, not
  an input), three sign-in options (set password, Google, Microsoft),
  and a clear "ask {inviter} to resend" + mailto: fallback for invalid
  codes.
- OAuth state for invitees is base64url(JSON({csrf, accountInviteCode,
  invitedEmail})). OAuthCallbackPage decodes both shapes, forwards the
  invite fields to the backend, and surfaces invite_email_mismatch /
  invite_invalid_or_expired_or_revoked errors with friendly text.
  Successful invite-OAuth lands on /?welcome=teammate (suppresses the
  welcome wizard for invitees per spec).
- UserCreate type + invite/auth API clients extended for the new fields.

Tests
- Backend: invite lookup happy path + four invalid-state collapse, OAuth
  callback links invite when supplied + rejects on email mismatch.
- Frontend Vitest: AcceptInvitePage renders account name + locked email
  + accept buttons; resend message + mailto on invalid code.

All 43 backend auth/account/invite/email-verification tests green;
frontend Vitest 120/120 green; tsc -b clean.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

2026-05-06 21:34:22 -04:00

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