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Two bugs fixed at once. The previous version of the dashboard onboarding
checklist (a) flashed for ~500 ms on every page-load even for fully
onboarded users, and (b) auto-rendered expanded, pushing the real
dashboard tiles below the fold each visit.
Flicker root cause: the component decided render/no-render off
`shouldShowChecklist({ measurementCount, ... })` while `measurementCount`
was still 0 because the analytics query was in flight. For a user with
30 measurements + a non-null `onboardingCompletedAt`, `stillInSetup`
flipped from `true` (load) to `false` (post-fetch) — exactly long
enough to be visible. Fix: refuse to render until
`analyticsQuery.data !== undefined`. Tanstack-query writes `data`
exactly once per fetch, and the dashboard's `/api/analytics` query
shares the cache key, so the checklist almost always reads cached data
synchronously and never blocks UI.
Auto-open: introduce an `expanded` state, default `false`, persisted
to `localStorage[healthlog-getting-started-expanded]` so a deliberate
expand survives reloads but new users see a collapsed shell. Header
becomes a chevron toggle (`aria-expanded` / `aria-controls`); the
progress meter stays visible in both states so a glance still shows
how much setup is left.
`e2e/onboarding-flicker.spec.ts` covers both contracts: a
sample-every-50ms loop during a deliberately-slowed analytics fetch
proves the card never paints for a complete-onboarding user, and a
second test mounts an incomplete user, asserts `aria-expanded=false`
and that `#getting-started-body` is NOT in the DOM until clicked.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>