Pricing grid redesign: implement variant1

[dlind1]

Fixes DOTCOM-17769

Proposed Changes

• Show the new design in onboarding and /plans page for six_plan_new_design variant.

Onboarding flow

Ineligible flow

Why are these changes being made?

• Part of the pricing grid redesign

Testing Instructions

• Assign yourself to six_plan_new_design variant and navigate to /setup/onboarding.
• Create a new site and confirm that the new design is shown during onboarding (without interval selector) and on /plans.
• Create a new site from /setup/reblogging flow and confirm that the old design is shown in onboarding and on /plans.

Pre-merge Checklist

• Has the general commit checklist been followed? (PCYsg-hS-p2)
• Have you written new tests for your changes?
• Have you tested the feature in Simple (P9HQHe-k8-p2), Atomic (P9HQHe-jW-p2), and self-hosted Jetpack sites (PCYsg-g6b-p2)?
• Have you checked for TypeScript, React or other console errors?
• For UI changes, have you tested the affected components in dark mode?
• Have you tested accessibility for your changes? Ensure the feature remains usable with various user agents (e.g., browsers), interfaces (e.g., keyboard navigation), and assistive technologies (e.g., screen readers) (PCYsg-S3g-p2).
• Have you used memoizing on expensive computations? More info in Memoizing with create-selector and Using memoizing selectors and Our Approach to Data
• Have we added the "[Status] String Freeze" label as soon as any new strings were ready for translation (p4TIVU-5Jq-p2)?
  • For UI changes, have we tested the change in various languages (for example, ES, PT, FR, or DE)? The length of text and words vary significantly between languages.
• For changes affecting Jetpack: Have we added the "[Status] Needs Privacy Updates" label if this pull request changes what data or activity we track or use (p4TIVU-aUh-p2)?

[github-actions]

Calypso Live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-186947

Jetpack Cloud Live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-186947&env=jetpack

Automattic for Agencies Live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-186947&env=a8c-for-agencies

Dashboard Live (dotcom) (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-186947&env=dashboard

Dashboard Live (A4A) (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-186947&env=dashboard-a4a

[Copilot]

Pull request overview

Implements the “variant1” pricing grid redesign behavior behind the six_plan_new_design ExPlat experiment, ensuring the redesigned experience is shown during new-site onboarding while keeping the existing plan type selector behavior on non-signup (/plans) pages.

Changes:

• Hide the plan type selector during signup when the plans grid redesign experiment is active.
• Refine experiment eligibility for logged-in /plans pages to require both the gating flag and that the site was created via the onboarding flow.
• Add/adjust unit tests to cover the new experiment gating and plan type selector visibility rules.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
client/my-sites/plans-features-main/test/index.jsx	Adds tests ensuring the plan type selector is hidden only for redesign variants during signup.
client/my-sites/plans-features-main/index.tsx	Hides the plan selector in signup when usePlansGridRedesign is enabled.
client/my-sites/plans-features-main/hooks/use-plans-grid-redesign-experiment.ts	Tightens eligibility to require onboarding-created sites (plus gating flag) for logged-in flows.
client/my-sites/plans-features-main/hooks/test/use-plans-grid-redesign-experiment.test.ts	Updates and expands tests to validate the new eligibility logic.

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