chore(qlik): log raw sample of 4 new metrics to isolate empty columns

Adds a sample log of the first extracted rows (all 8 hypercube columns)
and a sample of the network metrics matched from cache in getProductRows,
to pinpoint whether the new measures return null from Qlik, fail to
persist, or fail to render.

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

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

@@ -474,6 +474,8 @@ async function enrichWithNetworkMetrics(productMap: Map<string, ProductRow>): Pr
         if (byCodeCentrale.size === 0) return;
 
         const metrics = await getNetworkMetricsByCodeCentrale([...byCodeCentrale.keys()]);
+        const firstMatch = [...byCodeCentrale.keys()].find((cc) => metrics.has(cc));
+        console.log(`[getProductRows] réseau: ${byCodeCentrale.size} codes centraux → ${metrics.size} matchés en cache. Sample:`, firstMatch ? JSON.stringify(metrics.get(firstMatch)) : "aucun match");
         for (const [cc, products] of byCodeCentrale.entries()) {
             const m = metrics.get(cc);
             if (!m) continue;