Forms: fix close modal in responsive mode

[enejb]

Currently when you have are on the dashboard and you have a response open for viewing.
And you resize the window from desktop to mobile the modal that shows up is not able to be closed.

This PR makes it so that the modal is able to be closed when we end up in this situation.

See

Screen.Recording.2025-10-17.at.4.22.35.PM.mov

Proposed changes:

• Have a new state that is only used for this modal.

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?
• Have you tested your changes on WordPress.com, if applicable (if so, you'll see a generated comment below with a script to run)?

Jetpack product discussion

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

No

Testing instructions:

Visit the forms dashboard.
Open a response.
Resize the window till you see the Modal.
Click the X or press esc and notice that the Modal closes as expected.

[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 fix/close-modal-forms branch.
• To test on Simple, run the following command on your sandbox:

bin/jetpack-downloader test jetpack fix/close-modal-forms

Interested in more tips and information?

• In your local development environment, use the jetpack rsync command to sync your changes to a WoA dev blog.
• Read more about our development workflow here: PCYsg-eg0-p2
• Figure out when your changes will be shipped to customers here: PCYsg-eg5-p2

[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).
• WoA releases happen weekly.
• Releases to self-hosted sites happen monthly:
  • Scheduled release: November 4, 2025
  • Code freeze: November 3, 2025

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[jp-launch-control]

Code Coverage Summary

Coverage changed in 1 file.

File	Coverage	Δ%	Δ Uncovered
projects/packages/forms/src/dashboard/components/response-view/single.tsx	0/26 (0.00%)	0.00%	5 💔

Full summary · PHP report · JS report

_{If appropriate, add one of these labels to override the failing coverage check: Covered by non-unit tests Use to ignore the Code coverage requirement check when E2Es or other non-unit tests cover the code Coverage tests to be added later Use to ignore the Code coverage requirement check when tests will be added in a follow-up PR I don't care about code coverage for this PR Use this label to ignore the check for insufficient code coveage.}

[edanzer]

Simple change, and fixes the issue! LGTM.