Agents Manager: Add more custom events

[wellyshen]

Part of BSKY-1480.

For controlling the Unified Chat UI, we are now using the global custom events. However, I feel that implementing (and consuming) a get method using JavaScript’s CustomEvent() is somewhat roundabout. A more suitable approach would be to use a global variable, as shown below, for both get and set methods.

That said, during this transition period, I plan to implement these methods using the existing custom events. If you prefer the global variable approach, please feel free to let me know. The conversion should be quick with the help of AI 🤖.

// Setup: Agents Manager
window.__agentsManagerData = {
  getChatState: () => { ... }
  setIsChatOpen: ( isOpen ) => { ... }
};

// Consume: Big Sky
const { isOpen } = window.__agentsManagerData.getChatState();

Proposed Changes

• Add set chat enabled/rendered event handler
• Add set chat compact mode event handler
• Add get chat state event handler
• Update the doc

Why are these changes being made?

• See BSKY-1480

Testing Instructions

• TBD

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-168665

Jetpack Cloud live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-168665&env=jetpack

Automattic for Agencies live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-168665&env=a8c-for-agencies

Dashboard live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-168665&env=dashboard

[matticbot]

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

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

• agents-manager
• blaze-dashboard
• help-center
• notifications
• odyssey-stats

To test WordPress.com changes, run install-plugin.sh $pluginSlug add/agents-manager-more-custom-events on your sandbox.