Forms: use entire button area for selecting multi-select options

[simison]

Resolves FORMS-131

Proposed changes:

• Makes entire button style checkbox clickable area, instead of just text+checkbox

While this introduces some semantic oddity (there's a "label" CSS class in span, it achieves a functionally better experience without compromising backwards compatibility.

An alternative would be reworking the CSS class structure and perhaps applying the tag change only to the button style.

Other information:

• Have you written new tests for your changes, if applicable?
• Have you checked the E2E test CI results, and verified that your changes do not break them?
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Jetpack product discussion

Does this pull request change what data or activity we track or use?

Testing instructions:

• Add couple multi selection checkbox fields
• Swhich to pill style
• Try both fields still look good on editor and frontend
• Try clicking them, try keyboard navigate them

[github-actions]

Are you an Automattician? Please test your changes on all WordPress.com environments to help mitigate accidental explosions.

• To test on WoA, go to the Plugins menu on a WoA dev site. Click on the "Upload" button and follow the upgrade flow to be able to upload, install, and activate the Jetpack Beta plugin. Once the plugin is active, go to Jetpack > Jetpack Beta, select your plugin (Jetpack), and enable the update/forms-multi-checkbox-button-label branch.
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bin/jetpack-downloader test jetpack update/forms-multi-checkbox-button-label

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[github-actions]

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Jetpack plugin:

The Jetpack plugin has different release cadences depending on the platform:

• WordPress.com Simple releases happen as soon as you deploy your changes after merging this PR (PCYsg-Jjm-p2).
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  • Scheduled release: January 6, 2026

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[jp-launch-control]

Code Coverage Summary

This PR did not change code coverage!

That could be good or bad, depending on the situation. Everything covered before, and still is? Great! Nothing was covered before? Not so great. 🤷

Full summary · PHP report · JS report

[CGastrell]

Works nicely!