Reader onboarding rsm - remove previously subscribed blogs from subscriptions modal, update some styles.

[Addison-Stavlo]

Part of #

Proposed Changes

Updates the subscriptions shown in the subscription list to

• Not recommend blogs the user is already subscribed to, but also not to drop them from the list on subscribe.
• Not jump/reorganize list after more items load.
• Interleave curated blogs by tags, to prevent having too many neighbors of the same topic in the list.
• Move the logic for the sites to its own helper/hook.

Also updates some styles for the modals:

• Subscribe modal shows the preview stream column on smaller viewports where it was being hidden unnecessarily.
• Interests modal spacing adjusted so "see more topics" link is visible at top scroll position in the modals full intended size.

Why are these changes being made?

Testing Instructions

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)?

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[Copilot]

Pull request overview

This PR refactors the Reader onboarding RSM “Discover/Subscribe” step to centralize recommendation selection/filtering logic in a dedicated hook, while adjusting modal layouts for improved responsiveness and spacing.

Changes:

• Introduces useSubscribeRecommendations to fetch, interleave, dedupe, weight, and filter blog recommendations (including excluding already-followed sites while keeping newly-subscribed items visible).
• Updates the subscribe modal to consume the new hook, add site prefetching, and adjust loading/validation states.
• Tweaks responsive breakpoints/spacing in subscribe + interests modal styles and removes a duplicate curated blog entry.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
client/reader/onboarding-rsm/subscribe-modal/use-subscribe-recommendations.ts	New hook to build and validate recommendation lists, bridge feed data into Redux, and pin validated recommendations.
client/reader/onboarding-rsm/subscribe-modal/index.tsx	Refactors modal to use the new hook, prefetch site metadata, and adjust loading/pagination behavior.
client/reader/onboarding-rsm/subscribe-modal/style.scss	Adjusts responsive breakpoints to show/hide preview column at smaller widths.
client/reader/onboarding-rsm/interests-modal/style.scss	Reduces content padding to keep the “see more topics” link visible.
client/reader/onboarding-rsm/interests-modal/index.tsx	Adjusts VStack spacing to better fit the modal layout.
client/reader/onboarding-rsm/curated-blogs/society.tsx	Removes a duplicate curated blog entry.

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[Copilot]

Pull request overview

Copilot reviewed 6 out of 6 changed files in this pull request and generated 4 comments.

[Copilot]

Pull request overview

Copilot reviewed 7 out of 7 changed files in this pull request and generated 1 comment.

[Copilot]

Pull request overview

Copilot reviewed 7 out of 7 changed files in this pull request and generated no new comments.

[Copilot]

Pull request overview

Copilot reviewed 7 out of 7 changed files in this pull request and generated no new comments.