fix(qlik): batch SelectValues to avoid Engine abort + drop couv stock metric

Large supplier (4816 codes) triggered Qlik Engine "Request aborted"
(code 15): a single SelectValues over all codes forced the hypercube to
calculate too many rows at once. Now select in 1200-code batches and
accumulate, keeping each calc small. 1417 codes worked before, 4816 did
not - chunking scales to any supplier.

Also remove the "Couverture de stock" network column end-to-end (grid,
types, Qlik clients, cache, schema, db-init), shifting the marge measure
index from 6 to 5 and the hypercube width from 7 to 6.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/features/grid/api/get-product-rows.ts

@@ -484,7 +484,6 @@ async function enrichWithNetworkMetrics(productMap: Map<string, ProductRow>): Pr
                 product.qteReseau = m.qteReseau;
                 product.nbMagasinsReseau = m.nbMagasinsReseau;
                 product.caParMagasinReseau = m.caParMagasinReseau;
-                product.couvertureStockReseau = m.couvertureStockReseau;
                 product.margePctReseau = m.margePctReseau;
                 product.tauxPresenceReseau = m.nbMagasinsReseau / NB_MAGASINS_RESEAU;
                 product.networkFetchedAt = m.fetchedAt ?? undefined;