Domains Management Revamp: Center align Overview tab and fix form styles

[phcp]

Closes #97977

Proposed Changes

• Center align Overview tab, increasing the max-width to 1400 to match the site overview size.
• Add border radius to the Overview tab.
• Fix form styles from Domain Forwarding and Glue Records expandable cards.
• Fix styles of the loading placeholder for the overview tab.
• The email tab was already center aligned, so no changes were applied.

Why are these changes being made?

• This is part of the Domain Management Revamp project: pfuQfP-13x-p2

Testing Instructions

• Apply this PR to your local.
• Go to http://calypso.localhost:3000/domains/manage?flags=calypso/all-domain-management.
• Select a domain from the list.
• You should see the Overview tab aligned in the center and with rounded borders.
• Check if the placeholder also matches the container width and has rounded borders.
• Expand the Domain Forwarding and Glue Records cards.
• Check if the forms are rendered with consistent spacing and rounded borders.
• Perform the same tests in the site context.
• Perform regression tests in the previous layout.

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 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-130094

Jetpack Cloud live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-130094&env=jetpack

Automattic for Agencies live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-130094&env=a8c-for-agencies

[matticbot]

This PR does not affect the size of JS and CSS bundles shipped to the user's browser.

Generated by performance advisor bot at iscalypsofastyet.com.

[matticbot]

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

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

• blaze-dashboard
• command-palette-wp-admin
• help-center
• notifications
• odyssey-stats
• whats-new
• wpcom-block-editor

To test WordPress.com changes, run install-plugin.sh $pluginSlug add/domains-management-overview-styles on your sandbox.

[bogiii]

I've tested it, and it looks nice. No regressions were found.

🚢