feat(apps): read products by id instead of loading the whole catalogue

Step 3 of docs/CATALOG-PAGINATION-PLAN.md. Step 2 added the targeted
routes; these are the five callers that were fetching all ~16k products
to find a handful of rows:

  product screen    whole catalogue, then find(id)  -> GET /products/:id
  cart re-sync      whole catalogue for 2-3 lines   -> ?ids=
  favourites        whole catalogue, filtered here  -> ?ids=
  home categories   categories derived from it      -> /products/facets
  order row labels  joined on variantId             -> included with the order

Three of these were not merely slow, they were going to be wrong.
Favourites filtered the loaded catalogue, so once the list pages a
favourite outside the loaded slice silently disappears. Home categories
were derived the same way, so a category whose products all sit further
down would vanish from the home screen. Order rows looked their title up
in the catalogue, which ALREADY failed for a product that had since left
the storefront — exactly the old orders history exists for — and
rendered a blank row.

Order labels went to the server rather than to another id lookup: the
item carries productVariantId, not a product id, so ?ids= could not
answer it. One nested include in getOrders returns the variant, its
product and the product's first image. Deliberately NOT filtered by
storefront visibility, so a de-listed product still shows what was
bought; asserted in the new spec. OrderItemCard is synchronous now — no
fetch, no onMounted, the row renders complete on its first frame.

variantLookup is deleted from catalogStore rather than left behind: it
existed only to label order rows, and keeping it would have kept a
reason to load the full catalogue.

getProductsByIds chunks at 100 because the route caps ids there and
drops the rest. A partial answer reads to callers as "these products are
no longer on the storefront" — the cart would silently drop valid lines.
Favourites already run to 874 rows in the imported data (FAV-01).

A failed cart re-sync now leaves the cart alone: it is the person's own
data in localStorage, and dropping lines because the network blinked is
worse than a slightly stale price. The product screen tells a real 404
from a failed request, so only the former renders the not-found page.

One bug introduced and caught while doing this: moving the home
categories to /facets meant memory.init() no longer loaded the catalogue
as a side effect, and the home rails read catalog.products — the home
screen would have rendered empty rails. HomeView now loads it
explicitly. Found by grepping every caller of configStore.init, which is
also how I know HomeView is the only one.

Still on the unpaged list by design: the home rails and the
search/newest lists. Moving those onto paged reads is step 4, kept
separate because it is the risky part — debounce, loading state, and
telling "no results" from "still loading".

api 334/334 across 30 suites; both apps vue-tsc clean. getOrders has a
spec now (3 cases) because its include is a contract both apps depend on
and the method had no test at all. Nothing click-tested — the cart
re-sync and the favourites screen are the two worth a manual pass.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

apps/user-app/src/components/product/OrderItemCard.vue

@@ -3,9 +3,10 @@
   language (see components/home/* and HomeView). Ported originally from
   legacy henza_pwa/src/components/product/orderItem.vue.
 
-  Adapted: product/variant title comes from a client-side lookup (see
-  useOrderItemProduct.ts) since the real order-items response only carries
-  productVariantId.
+  The product/variant title and photo come WITH the order (the server includes
+  each item's variant and product). They used to be looked up in the browser
+  against the whole catalogue, which downloaded ~16k products to label a few
+  rows and left the row blank for a product that had since left the storefront.
 
   DROPPED the "توضیحات: -" row the previous version rendered: our OrderItem
   schema has no note field (legacy's per-item note was a real column there;
@@ -46,18 +47,17 @@
 </template>
 
 <script setup lang="ts">
-import { onMounted, ref } from 'vue'
+import { computed } from 'vue'
 import Icon from '../icon/Icon.vue'
-import { useOrderItemProduct, type VariantLookup } from '../../composables/useOrderItemProduct'
+import { orderItemLookup } from '../../composables/useOrderItemProduct'
 import type { OrderItemDetail } from '../../api/client'
 
 const props = defineProps<{ value: OrderItemDetail }>()
-const { lookup: lookupVariant } = useOrderItemProduct()
-const lookup = ref<VariantLookup | undefined>()
 
-onMounted(async () => {
-  lookup.value = await lookupVariant(props.value.productVariantId)
-})
+// The server sends these with the order, so there is nothing to fetch and
+// nothing to wait for — the row renders complete on its first frame instead of
+// filling in after a catalogue download.
+const lookup = computed(() => orderItemLookup(props.value))
 </script>
 
 <style scoped lang="less">