Add Cash Drawer Api

[merkoyep]

Background

https://github.com/shop/issues-retail/issues/16752

Solution

This PR introduces the Cash Drawer API to the UI Extensions repository. As extension targets have yet to be finalized, this PR introduces the API only.

https://github.com/Shopify/ui-api-design/pull/1232

🎩

• Review documentation and that this API was implemented properly in this repo.

Checklist

• I have 🎩'd these changes
• I have updated relevant documentation

[merkoyep]

• Add Cash Drawer Api #3216 : 2 dependent PRs (#3143 , #3248 ) 👈 (View in Graphite)
• unstable

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[github-actions]

We detected some changes in packages/*/package.json or packages/*/src, and there are no updates in the .changeset directory. If the changes are user-facing and should cause a version bump, run yarn changeset to track your changes and include them in the next release CHANGELOG. If you are making simple updates to repo configuration, examples, or documentation, you do not need to add a changeset.

[github-actions]

📝 POS Version Documentation Reminder

We detected changes in packages/*/src/surfaces/point-of-sale, but there are no updates to the POS versions documentation.

If these changes are user-facing and should be documented in the version changelog, please update:
packages/ui-extensions/docs/surfaces/point-of-sale/staticPages/pages/versions.doc.ts

If you are making internal changes that don't affect the public API, you can ignore this reminder.

[alexkung1]

LGTM ✅

[merkoyep]

Note: Branch on hold, waiting for 2026-01 RC to be created