## Summary
orders_o::getOrderItems() selected order items without an explicit ORDER
BY clause, so MySQL was free to return rows in any order. On the POS
Fuldfør click and the superuser invoice tree, addons (related_item_id !=
NULL) were sometimes returned before their primary item, which broke the
FE tree-builder and the OrderContentTable render.
Add a stable ordering: primary items first (related_item_id IS NULL
DESC), addons grouped by their parent (related_item_id ASC), and
insertion order as the final tiebreaker (id ASC).
## Commits
- 7ec64ec8 fix(api): order order_items so primary precedes addons in
getOrderItems
- 68e19bee test(api): pin order_items listing ordering in getOrderItems
## Test plan
- Wiring unit test asserts the SELECT inside getOrderItems still carries
ORDER BY (related_item_id IS NULL) DESC, related_item_id ASC, id ASC.
- Verified locally with php -l on the modified file.
- Existing OrderItemReasonPolicyTest, CustomerOrderProductPolicyTest,
OrdersIncludeInInvoiceOverrideTest continue to pass in the worktree
setup (no DB fixtures touched).
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Co-authored-by: Truck Wash Agent <agent@copenhagentruckwash.local>
