Add payment sessions to the orders app

[marcomontalbano]

Related to commercelayer/issues-app#662

What I did

Adds support for the new payment model (API version 2026-05), where an order is funded by a list of payment sessions instead of a single payment_method/payment_source. Both models can coexist on an order indefinitely, so this is additive rather than a cutover.

• Show an order's payment sessions on the details page, one row per session with the card brand or gateway logo, the status, the amount and an actions dropdown.
• Rename OrderPayment.tsx to OrderPaymentLegacy.tsx and render both it and the new OrderPaymentSessions unconditionally. Each self-gates on its own data, so only one ever shows anything for a given order.
• Add usePaymentSessionActions with Capture and Void authorization, both behind a confirmation dialog.
• Add a payment details modal built on useResourceDetailsModal from app-elements, adding a payments-specific Transactions tab between Attributes and Events.
• Recover each transaction's kind in that tab by matching ids against the session's typed relationships, since entries in payment_transactions come back as the generic payment_transactions type rather than payment_captures or payment_authorizations.
• Add paymentDisplay.ts, resolving the logo, label and last 4 digits for a session, falling back from card brand to gateway to a generic credit-card icon. Card details are extracted per gateway, since response_data is verbatim gateway output with no shared shape.
• Extend the useOrderDetails include list with the payment session relationships.
• Bump @commercelayer/app-elements across the workspace to the preview carrying useResourceDetailsModal.

How to test

1. Open an order created on API version 2026-05 and check the Payments section lists one row per payment session.
2. Check each row shows the card brand when it can be determined (Visa, Mastercard, and so on), otherwise the gateway (Stripe, Adyen, Gift Card), with the last 4 digits where available.
3. Open the ··· menu on a session and pick View details. Check the modal shows Attributes, Transactions and Events.
4. On Transactions, check each row reads as authorization succeeded, capture succeeded and so on, rather than a generic transaction, and that expanding one shows its raw JSON.
5. On an authorized session, use Capture and Void authorization from the dropdown and check the order refreshes afterwards.
6. Open an order created on API version 2017-08 and check the legacy payment display is unchanged.
7. Check an order with a gift card session shows the gift card logo and the code's last 4 digits.

Checklist

• Make sure your changes are tested (stories and/or unit, integration, or end-to-end tests).
• Make sure to add/update documentation regarding your changes.
• You are NOT deprecating/removing a feature.

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