Notifications v2: implement note list and note details shortcuts

[fushar]

Fixes DOTCOM-14291

Proposed Changes

Implement the following shortcuts in notifications v2:

From note list

• (arrow down):
  • if we're just going back to the note from details: it will navigate from that note
  • otherwise, it will go to the first note in the list
• (arrows up/down): after the list has focus, arrows will behave as expected to navigate the note list

From note details

• a: approve
• s: mark as spam
• t: move to the trash
• l: like
• e: edit
• (arrows up/down): go to prev/next note in the current filter

After s and t, we will go back to the note list, and focus will be set to the next note.

Testing Instructions

1. Go to /v2
2. Click notification bells
3. Use your keyboard and try the above shortcuts

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-154773

Jetpack Cloud live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-154773&env=jetpack

Automattic for Agencies live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-154773&env=a8c-for-agencies

[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 notif-v2-navigation on your sandbox.

[arthur791004]

Tested but I found the t didn't work 🤔

[arthur791004]

I guess we don't need this 😅

[fushar]

Bad copy-paste, fixed in 6307bd9.

[fushar]

Tested but I found the t didn't work 🤔

Good catch, fixed in edb5c86 🤦

[arthur791004]

Tested again and looks good 👍