Add more pos ui extension doc examples

[vctrchu]

Part of https://github.com/shop/issues-retail/issues/20825

Background

Below is a table showing the APIs with New Examples Added (7)

API	New Example File	What It Demonstrates	Reason
Session API	current-session.jsx	Access currentSession properties (shop, user, staff, location, currency, POS version)	Two distinct methods: currentSession vs getSessionToken()
Order API	order-details.jsx	Display name and customerId properties	3 properties available, only 1 was documented
Draft Order API	draft-order-details.jsx	Display name and customerId properties	3 properties available, only 1 was documented
Scanner API	scanner-data-subscribe.jsx	Subscribe to scannerData for scan events with history tracking	Two subscribables: sources and scannerData
Product API	product-variant.jsx	Access both id and variantId	2 properties available, only 1 was documented
PinPad API	validation-with-options.jsx	Use PinPadOptions with onDismissed callback for post-validation flow	Optional parameters not previously demonstrated
Toast API	show-with-duration.jsx	Display toasts with custom duration (2s vs 8s examples)	Optional duration parameter not previously demonstrated

Below is the table of APIs Excluded from Additional Examples (4)

API	Existing Example	Why Excluded
Cart Line Item API	id.jsx	Single property (cartLineItem) - API surface too small for meaningful second example
Connectivity API	subscribe.jsx	Single subscribable (current) - existing example adequately covers usage
Customer API	id.jsx	Single property (id) - API surface too small for meaningful second example
Locale API	subscribe.jsx	Single subscribable (current) - existing example adequately covers usage

Solution

• Before: 11 APIs with only 1 example each
• After: 7 APIs with 2+ examples, 4 APIs with 1 example (appropriate for their limited surface area)

🎩

https://pr-65216.shopify-dev.shopify.io/docs/api/pos-ui-extensions/latest/apis/draft-order-api
https://pr-65216.shopify-dev.shopify.io/docs/api/pos-ui-extensions/latest/apis/order-api
https://pr-65216.shopify-dev.shopify.io/docs/api/pos-ui-extensions/latest/apis/pinpad-api
https://pr-65216.shopify-dev.shopify.io/docs/api/pos-ui-extensions/latest/apis/product-api
https://pr-65216.shopify-dev.shopify.io/docs/api/pos-ui-extensions/latest/apis/scanner-api
https://pr-65216.shopify-dev.shopify.io/docs/api/pos-ui-extensions/latest/apis/session-api
https://pr-65216.shopify-dev.shopify.io/docs/api/pos-ui-extensions/latest/apis/toast-api

Checklist

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

[vctrchu]

I'll need to cherry-pick this into 2026-01-rc as well

[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.

[mcvinci]

Thanks so much for adding these new examples, @vctrchu! I've made some minor suggestions re: wording of codeblock titles.