A4A: Implement the initial product category menu using a standardized side-scrolling behavior.

[jkguidaven]

This PR introduces a working carousel menu on the new Products page. Just so you know, the menu items are placeholders and will be replaced with actual items in a separate PR.

We want this PR to focus exclusively on the Carousel element and the scroll-down behavior.

Screen.Recording.2025-01-09.at.11.18.23.PM.mov

Depends on #98086
Related to https://github.com/Automattic/automattic-for-agencies-dev/issues/1636

Proposed Changes

• Standardize side-scrolling behavior in A4A using a Carousel component. This new component will be reused later for other side-scrolling use cases in the A4A context.
• Implement the product category menu on the new products page using the carousel component. For now, we will use placeholder items, which we will replace later with actual menu items in a separate PR.

Why are these changes being made?

• This is part of the Marketplace UX improvement project.

Testing Instructions

• Use the A4A live link and go to the /marketplace/products?flags=a4a-product-page-redesign.
• Test out the Product category menu carousel and scroll down behavior.

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-129586

Jetpack Cloud live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-129586&env=jetpack

Automattic for Agencies live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-129586&env=a8c-for-agencies

[matticbot]

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

Sections (~436 bytes added 📈 [gzipped])

name                          parsed_size           gzip_size
a8c-for-agencies-marketplace      +1831 B  (+0.2%)     +436 B  (+0.2%)

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

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.

[matticbot]

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

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

• notifications
• wpcom-block-editor

To test WordPress.com changes, run install-plugin.sh $pluginSlug add/a4a/product-category-menu on your sandbox.

[travisw]

pretty neat - lgtm 🚀

[travisw]

It would be cool to allow the content to be scrolled by swiping on mobile screens. Just an idea for later.

[jkguidaven]

That is good suggestion. I'll add a low-prio ticket to address this. 👍

[a8ci18n]

This Pull Request is now available for translation here: https://translate.wordpress.com/deliverables/17193310

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.

Hi @jkguidaven, could you please edit the description of this PR and add a screenshot for our translators? Ideally it'd include all of the following strings:

• Shop by category
• Shop products by category

Thank you in advance!

[a8ci18n]

Translation for this Pull Request has now been finished.

[jeffgolenski]

Looks great James

[madebynoam]

@jkguidaven looking good! Just leaving a note for the details to tweak (transition timing) later on:
#98214 (comment)