Agents Manager: Restrict zoom action to editor pages

[wellyshen]

Part of BSKY-1892

Proposed Changes

• Add an isEditorPage() guard to the zoom action hook so the zoom button only appears on editor pages (site editor, post/page editor).
• Align the action id from zoom-toggle to zoom, matching the convention used by other message action hooks (copy, checkpoint, sources).

Why are these changes being made?

The zoom action button was appearing on all pages, including non-editor contexts where show_component tool messages are not meaningful. This restricts it to editor pages only.

Testing Instructions

A minor fixing, will do self-review, test, and then merge.

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-175232

Jetpack Cloud Live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-175232&env=jetpack

Automattic for Agencies Live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-175232&env=a8c-for-agencies

Dashboard Live (dotcom) (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-175232&env=dashboard

Dashboard Live (CIAB) (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-175232&env=dashboard-ciab

[Copilot]

Pull request overview

Restricts the “zoom” message action so it only appears in relevant WordPress editor contexts, and standardizes the action identifier to match other message action hooks.

Changes:

• Add an isEditorPage() guard so zoom actions are only registered for editor pages (site editor / post editor contexts).
• Rename the action id from zoom-toggle to zoom to align with other action IDs (copy, checkpoint, sources).

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[matticbot]

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

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

• agents-manager
• notifications
• wpcom-block-editor

To test WordPress.com changes, run install-plugin.sh $pluginSlug fix/am-zoom-action-outside-of-editors on your sandbox.