feat(settings): Experimental Tools framework (NPPM-2692)

[adekbadek]

Summary

Adds the generic Experimental Tools framework to newspack-plugin: a filter-based tool registration system, REST API, and a new Settings tab with CardFeature-based UI.

Full details, video walkthroughs, and test plan in the companion PR:
https://github.com/Automattic/newspack-manager/pull/529

🤖 Generated with Claude Code

[Copilot]

Pull request overview

Introduces a new “Experimental Tools” framework to Newspack Settings: external plugins can register tools via a filter, Newspack persists per-tool state in an option, exposes REST endpoints for toggling/saving settings, and adds a new Settings tab with a CardFeature-based UI and configuration view.

Changes:

• Added Experimental_Tools PHP manager (filter registration, option storage, REST API, usage tracking) and wired it into plugin includes + Newspack Settings tab data.
• Added a new Settings UI section (experimental-tools) with enable modal + per-tool configure form, plus supporting TS types and styles.
• Updated CardFeature styling to better support equal-height cards / action row placement; added unit tests for the new PHP framework.

Reviewed changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated 9 comments.

Show a summary per file

File	Description
includes/experimental-tools/class-experimental-tools.php	Core framework: registration, persistence, REST routes, accessors, usage tracking.
includes/class-newspack.php	Loads the new Experimental Tools class.
includes/wizards/newspack/class-newspack-settings.php	Adds “Experimental tools” settings tab when tools are registered.
src/wizards/newspack/views/settings/sections.tsx	Lazily loads the new experimental-tools settings section.
src/wizards/newspack/views/settings/experimental-tools/index.tsx	Main UI list + configure route switching and REST interactions.
src/wizards/newspack/views/settings/experimental-tools/configure-view.tsx	Per-tool configuration form and client-side validation.
src/wizards/newspack/views/settings/experimental-tools/enable-modal.tsx	Enable confirmation modal for tools.
src/wizards/newspack/views/settings/experimental-tools/types.ts	Type definitions for tool + field schema.
src/wizards/newspack/views/settings/experimental-tools/style.scss	Styles for the configure view / display fields.
packages/components/src/card-feature/style.scss	Layout adjustments for CardFeature.
tests/unit-tests/experimental-tools.php	Unit tests for registration, toggling, metadata, field saving, and usage tracking.

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