PR #1868 conflated "has workspace" with "completed onboarding" —
restore `onboarded_at` as the single signal, and route invited users
through a dedicated /invitations page before they ever see onboarding.
- Backend: CreateWorkspace + AcceptInvitation atomically set
onboarded_at alongside the member insert, establishing the
invariant "member row exists ↔ onboarded_at != null" at the DB
layer.
- Migration 065: one-shot backfill closes the dirty rows produced
by PR #1868 (users with a workspace but onboarded_at == null).
- Entry points (web callback, login, desktop App): if onboarded_at
is null, look up pending invitations by email and route to the
new batch /invitations page; otherwise the resolver picks
workspace / new-workspace as before.
- OnboardingPage: stops bouncing on hasWorkspaces; only
hasOnboarded bounces. Unblocks the user from completing
Step 3 (workspace creation) → Steps 4 / 5.
- StarterContentPrompt: only shows when the user is the solo
member of the workspace, so invited users never get prompted to
import starter content into someone else's workspace.
Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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