Social: Add edit template modal

[manzoorwanijk]

Extracted out of #46102 to demonstrate how to wire up the edit template modal

Proposed changes:

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?

Testing instructions:

• After following the instructions in Social: Integrate the unified modal for preview #46102
• Expand the Customize section
• Click on the "Edit template" button
• Confirm that it opens the dummy Social image template screen
• Close the modal
• Enable Social Image Generator toggle
• Notice the dummy "Edit template" button under it
• Click on it
• Confirm that it opens the same unified modal with the screen locked, i.e. there is no back button

Screen.Recording.2025-11-26.at.5.45.49.PM.mov

[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 add/social/edit-template-modal branch.
• To test on Simple, run the following command on your sandbox:

bin/jetpack-downloader test jetpack add/social/edit-template-modal

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• In your local development environment, use the jetpack rsync command to sync your changes to a WoA dev blog.
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[github-actions]

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[jp-launch-control]

Code Coverage Summary

No summary data is available for parent commit 1da0424, so cannot calculate coverage changes. 😴

If that commit is a feature branch rather than a trunk commit, this is expected. Otherwise, this should be updated once coverage for 1da0424 is available.

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