Domain management: Create add new mailbox subpage

[bogiii]

Closes #97822
Closes #97826

Proposed Changes

• Create "Add new mailbox" subpage
• Adjust the current logic to load a new subpage based on context

Why are these changes being made?

• Domain Management Revamp project

Testing Instructions

• Go to /domains/manage?flags=all-domain-management
• Select a domain with a created mailbox
• Click on the "Add mailbox" button
• Check if you stay inside the "all-domain-management" context
• Pass the purchase step
• Check if you end up on the mailbox list page

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-129124

Jetpack Cloud live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-129124&env=jetpack

Automattic for Agencies live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-129124&env=a8c-for-agencies

[matticbot]

Here is how your PR affects size of JS and CSS bundles shipped to the user's browser:

App Entrypoints (~16 bytes added 📈 [gzipped])

name                   parsed_size           gzip_size
entry-main                   +46 B  (+0.0%)      +10 B  (+0.0%)
entry-login                  +46 B  (+0.0%)      +10 B  (+0.0%)
entry-domains-landing        +46 B  (+0.0%)       +9 B  (+0.0%)

Common code that is always downloaded and parsed every time the app is loaded, no matter which route is used.

Sections (~326 bytes added 📈 [gzipped])

name                  parsed_size           gzip_size
domains                   +1495 B  (+0.1%)     +319 B  (+0.1%)
email                      +694 B  (+0.1%)     +177 B  (+0.1%)
update-design-flow          +46 B  (+0.0%)       +7 B  (+0.0%)
link-in-bio-tld-flow        +46 B  (+0.0%)       +7 B  (+0.0%)
copy-site-flow              +46 B  (+0.0%)       +7 B  (+0.0%)

Sections contain code specific for a given set of routes. Is downloaded and parsed only when a particular route is navigated to.

Async-loaded Components (~20 bytes added 📈 [gzipped])

name                                                                              parsed_size           gzip_size
async-load-signup-steps-page-picker                                                     +46 B  (+0.0%)       +6 B  (+0.0%)
async-load-signup-steps-domains                                                         +46 B  (+0.0%)       +7 B  (+0.0%)
async-load-purchase-modal-wrapper                                                       +46 B  (+0.0%)       +6 B  (+0.0%)
async-load-my-sites-checkout-purchase-modal-is-eligible-for-one-click-checkou...        +46 B  (+0.0%)       +6 B  (+0.0%)
async-load-calypso-my-sites-checkout-modal                                              +46 B  (+0.0%)       +7 B  (+0.0%)

React components that are loaded lazily, when a certain part of UI is displayed for the first time.

Legend

What is parsed and gzip size?

Parsed Size: Uncompressed size of the JS and CSS files. This much code needs to be parsed and stored in memory.
Gzip Size: Compressed size of the JS and CSS files. This much data needs to be downloaded over network.

Generated by performance advisor bot at iscalypsofastyet.com.

[Imran92]

LGTM. However, I've noticed that if we add a new mailbox and complete the checkout, after redirection, the new mailbox is not immediately visible in the list. If we do a reloading or tab switching, then it becomes visible. You can take care of that either here or create a new issue for it. So approving 👍

[phcp]

However, I've noticed that if we add a new mailbox and complete the checkout, after redirection, the new mailbox is not immediately visible in the list. If we do a reloading or tab switching, then it becomes visible.

Good call @Imran92. There is a new-email param that does that, so I just pushed a fix for that. Thank you!

[Imran92]

LGTM!

[a8ci18n]

This Pull Request is now available for translation here: https://translate.wordpress.com/deliverables/17094189

Some locales (Hebrew, Japanese) have been temporarily machine-translated due to translator availability. All other translations are usually ready within a few days. Untranslated and machine-translated strings will be sent for translation next Monday and are expected to be completed by the following Friday.

Thank you @bogiii for including a screenshot in the description! This is really helpful for our translators.

[bogiii]

@phcp, thanks for wrapping up this PR. 💯

[a8ci18n]

Translation for this Pull Request has now been finished.