Agents Manager show Sources component

[jcheringer]

Fixes BSKY-1582

Depends on 305-ghe-Automattic/agenttic

Summary

• Add SourcesDisplay component that renders a collapsible FoldableCard with deduplicated source links (page icon + title + chevron)
• Intercept data content blocks with a sources array in process-tool-messages.ts and replace them with the SourcesDisplay component
• Handle source link clicks with the same support-article detection logic as CustomALink (navigates to /post?link=... for support articles, records Tracks events)
• Add @automattic/components as an explicit dependency (was already used implicitly via SummaryButton)

Context

The workflow agent (wpcom-workflow-support_chat) returns support article sources alongside its text responses. After agenttic-client normalizes these into { type: 'data', data: { sources } } content blocks, this PR picks them up and renders a proper collapsible sources card instead of raw JSON.

Test plan

Setup (until the agenttic-client dependency is published)

This PR depends on unreleased changes in @automattic/agenttic-client. To test locally:

1. Clone the agenttic repo and checkout 305-ghe-Automattic/agenttic
2. Build and pack the client package:

   cd agenttic/packages/agenttic-client
   pnpm build
   pnpm pack

3. In Calypso, temporarily point the dependency to the packed tarball:

   # Replace all agenttic-client references
   - "@automattic/agenttic-client": "^0.1.54",
   + "@automattic/agenttic-client": "/path/to/agenttic/packages/agenttic-client/automattic-agenttic-client-0.1.54.tgz",

4. Run yarn install in Calypso root
5. Sync the agents manager app with your sandbox

Testing

• Make sure the Unified Experience is enabled - https://wordpress.com/wp-admin/profile.php
• Navigate to a page where the AI Chat is available and add ?agent=wpcom-workflow-support_chat to the URL
• Ask a question that triggers sources (e.g. "How to add a domain?")
• Verify the text answer renders normally and a collapsed "Sources" card appears
• Expand the sources card and verify source links are listed with page icon + title + chevron
• Click a source link — support articles should open in the post view, external links should open normally
• Reload the page and verify sources still appear correctly on the reloaded conversation
• Verify the sources card does not interfere with feedback action buttons (thumbs up/down)

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-172807

Jetpack Cloud Live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-172807&env=jetpack

Automattic for Agencies Live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-172807&env=a8c-for-agencies

Dashboard Live (dotcom) (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-172807&env=dashboard

Dashboard Live (CIAB) (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-172807&env=dashboard-ciab

[matticbot]

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

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

• agents-manager
• help-center
• notifications
• odyssey-stats
• wpcom-block-editor

To test WordPress.com changes, run install-plugin.sh $pluginSlug update/agents-manager-sources on your sandbox.