SSH Migration: Fix the Radio selected state

[valterlorran]

Closes DOTCOM-15229

Proposed Changes

• Fix the disabled color for the Radio button on the Securely share your access step.

Before

After

Why are these changes being made?

• While the Share SSH access step was loading, the radio input would appear not be selected.

Testing Instructions

• Visual inpsection should be enough.

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?
• 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-162488

Jetpack Cloud live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-162488&env=jetpack

Automattic for Agencies live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-162488&env=a8c-for-agencies

[Copilot]

Pull Request Overview

This PR fixes a visual bug in the SSH migration flow where disabled radio buttons appeared unselected during the loading state. The fix updates the background color of disabled checked radio buttons from white (--color-neutral-0) to a visible gray (--color-neutral-40).

Key Changes:

• Updated the disabled checked radio button styling to use a darker color that shows the selected state

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[matticbot]

This PR modifies the release build for the following Calypso Apps:

For info about this notification, see here: PCYsg-OT6-p2

• blaze-dashboard
• notifications
• wpcom-block-editor

To test WordPress.com changes, run install-plugin.sh $pluginSlug fix/ssh-migration-radio-selected-state on your sandbox.