feat: Add dashboard page displaying network KPIs and store statistics, along with a new PostgreSQL data client.

src/app/(dashboard)/dashboard/page.tsx

@@ -106,6 +106,7 @@ function NetworkKpiCard({
                 padding: "1.5rem",
                 position: "relative",
                 overflow: "hidden",
+                boxShadow: "0 4px 24px rgba(0,0,0,0.18), 0 1px 4px rgba(0,0,0,0.12)",
             }}
         >
             {/* Decorative glow */}
@@ -204,6 +205,7 @@ function StoreCard({ site, dateHier, dateN1 }: { site: DashboardSiteStats; dateH
                 border: "1px solid var(--border)",
                 overflow: "hidden",
                 position: "relative",
+                boxShadow: "0 4px 24px rgba(0,0,0,0.18), 0 1px 4px rgba(0,0,0,0.12)",
             }}
         >
             {/* Top accent bar */}
@@ -363,6 +365,7 @@ function Top10Table({ title, items, sortKey, accent }: {
                 overflow: "hidden",
                 flex: 1,
                 minWidth: 0,
+                boxShadow: `0 4px 24px rgba(0,0,0,0.18), 0 0 0 0px ${accent.bar}`,
             }}
         >
             {/* Table header */}
@@ -604,6 +607,7 @@ export default async function DashboardPage() {
                     padding: "1.5rem 2rem",
                     position: "relative",
                     overflow: "hidden",
+                    boxShadow: "0 4px 24px rgba(0,0,0,0.18), 0 1px 4px rgba(0,0,0,0.12)",
                 }}
             >
                 {/* subtle background pattern */}

src/lib/pg-ff-client.ts

@@ -561,14 +561,18 @@ export async function pgGetDashboardData(): Promise<DashboardData> {
         n1BySite.set(s.site, { ca: Number(s.ca_ttc) || 0, trafic: Number(s.trafic) || 0 });
     }
 
+    // Si le 2ème appel a renvoyé des données (n1BySite.size > 0), on utilise le jour de semaine N-1.
+    // Sinon (appel échoué ou jour sans données), on retombe sur ca_ttc_n1 de l'API (même date calendaire).
+    const weekdayN1Available = n1BySite.size > 0;
+
     const sites: DashboardSiteStats[] = (apiResult.sites ?? []).map(s => {
         const n1 = n1BySite.get(s.site);
         return {
             site: s.site,
             ca_hier: Number(s.ca_ttc) || 0,
-            ca_n1: n1?.ca ?? 0,           // uniquement jour de semaine N-1, jamais date calendaire
+            ca_n1: weekdayN1Available ? (n1?.ca ?? 0) : (Number(s.ca_ttc_n1) || 0),
             tickets_hier: Number(s.trafic) || 0,
-            tickets_n1: n1?.trafic ?? 0,  // idem
+            tickets_n1: weekdayN1Available ? (n1?.trafic ?? 0) : (Number(s.trafic_n1) || 0),
             qte_hier: 0,
             marge_hier: 0,
             lignes_hier: 0,