feat: post-signup feed activation bar (flagged)

[tsahimatsliah]

Summary

A persistent, non-dismissible feed activation bar pinned above the header on every page, shown only to signed-in users who registered but haven't set up their feed yet. Ports the design mock-up (#6345) into an engineering-ready change.

• Gated behind the post_signup_activation GrowthBook flag (default off). Flag off restores current behavior exactly.
• Audience: signed-in users where onboarding isn't complete — i.e. no tag/content-type customization (!isOnboardingComplete). Legacy users (registered before the requirement date) are exempt. Never shows on the /onboarding route.
• Placement: mounted in the shared MainLayout top slot; the bar's measured height is reserved via --safe-area-top so the rail, header and content shift down and it sits above all fixed chrome (device notch inset preserved).
• Design: dark glossy strip with a soft brand glow, progress ring (step 1 of 2), white primary CTA → routes to /onboarding with after_auth back to the current page. Content is centered with a capped width; copy wraps on mobile.
• Logging: impression via useLogEventOnce + click via LogEvent, both on a dedicated TargetType.PostSignupActivation.
• Presentational PostOnboardingActivationView split out (props-driven, provider-light) for a Storybook playground.

Changes vs the mock-up

• Removed the ?postOnboardingPreview=1 URL backdoor (QA-only; would have force-shown the bar to any visitor regardless of flag/eligibility).
• Switched impression/click logging from ad-hoc string events to the shared LogEvent/useLogEventOnce conventions.
• Dropped the accidental .gitignore / local launch.json edits.

Testing

• node scripts/typecheck-strict-changed.js
• pnpm --filter shared lint on changed files
• 3 activation tests (renders/routes to onboarding, required/no-dismiss, hidden when flag off)

Preview

• Storybook: Components/Post/PostOnboardingActivation

🤖 Generated with Claude Code

Preview domain

https://feat-post-signup-activation-bar.preview.app.daily.dev

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Project	Deployment	Actions	Updated (UTC)
daily-webapp	Ready	Preview	Jul 22, 2026 8:28pm
storybook	Building	Preview	Jul 22, 2026 8:28pm

[idoshamun]

I dont understand why do we need this resize observer

[tsahimatsliah]

Good call — dropped it, the whole effect is gone.

The bar's height is now a constant per breakpoint (9.25rem mobile / 5rem tablet+) and the space reservation is plain CSS in the module:

:global(body):has(.pinned) {
  --post-signup-activation-height: 9.25rem;
  --safe-area-top: calc(env(safe-area-inset-top, 0px) + var(--post-signup-activation-height));
}

Same var drives the bar's own height, so the two can't drift. No JS, no measuring, and it unsets itself when the bar unmounts. Verified in the dev server: with the bar mounted, body padding and every .fixed.top-0 element shift to exactly 148px (the bar's bottom edge); without it, back to 0.

[idoshamun]

I dont see this change live. have you forgot to push it?

[tsahimatsliah]

Sorry — you're right, it was sitting locally. Pushed now in 6fb7f3e (rebased on the latest main merge).