feat(06-02): replace redirect with real dashboard RSC at /admin

- 4 KPI cards: clienti attivi, revenue totale, progetti in corso, pagamenti in sospeso
- Activity feed: last 10 events with icon, label, detail, timestamp
- Page is RSC (async server component, no use client)
- revalidate = 0 for fresh data on each request

src/app/admin/page.tsx

@@ -1,6 +1,118 @@
-import { redirect } from "next/navigation";
+import { getDashboardStats } from "@/lib/dashboard-queries";
+import { Users, FolderOpen, Euro, Clock } from "lucide-react";
 
-// Dashboard page — content added in Phase 6 Plan 02
+export const revalidate = 0;
-export default function AdminRoot() {
+
-  redirect("/admin/clients");
+function KpiCard({
+  label,
+  value,
+  sub,
+  icon: Icon,
+  color,
+}: {
+  label: string;
+  value: string | number;
+  sub?: string;
+  icon: React.ElementType;
+  color: string;
+}) {
+  return (
+    <div className="bg-white rounded-xl border border-gray-200 p-5 flex items-start gap-4">
+      <div className={`p-2 rounded-lg ${color}`}>
+        <Icon size={20} strokeWidth={1.8} className="text-white" />
+      </div>
+      <div>
+        <p className="text-xs text-gray-500 font-medium uppercase tracking-wide">{label}</p>
+        <p className="text-2xl font-bold text-gray-900 mt-0.5">{value}</p>
+        {sub && <p className="text-xs text-gray-400 mt-0.5">{sub}</p>}
+      </div>
+    </div>
+  );
+}
+
+const ACTIVITY_ICONS: Record<string, string> = {
+  nuovo_cliente: "👤",
+  nuovo_progetto: "📁",
+  deliverable_approvato: "✅",
+  timer_stoppato: "⏱",
+};
+
+function fmt(ts: Date) {
+  return new Intl.DateTimeFormat("it-IT", {
+    day: "2-digit",
+    month: "short",
+    hour: "2-digit",
+    minute: "2-digit",
+  }).format(new Date(ts));
+}
+
+function fmtEur(val: string) {
+  return new Intl.NumberFormat("it-IT", { style: "currency", currency: "EUR" }).format(
+    parseFloat(val) || 0
+  );
+}
+
+export default async function AdminDashboard() {
+  const { kpi, activity } = await getDashboardStats();
+
+  return (
+    <div className="max-w-5xl">
+      <h1 className="text-2xl font-bold text-gray-900 mb-6">Dashboard</h1>
+
+      {/* KPI cards */}
+      <div className="grid grid-cols-2 lg:grid-cols-4 gap-4 mb-8">
+        <KpiCard
+          label="Clienti attivi"
+          value={kpi.clientiAttivi}
+          icon={Users}
+          color="bg-[#1A463C]"
+        />
+        <KpiCard
+          label="Revenue totale"
+          value={fmtEur(kpi.revenueTotale)}
+          sub="progetti non archiviati"
+          icon={Euro}
+          color="bg-emerald-600"
+        />
+        <KpiCard
+          label="Progetti in corso"
+          value={kpi.progettiInCorso}
+          icon={FolderOpen}
+          color="bg-blue-600"
+        />
+        <KpiCard
+          label="Pagamenti in sospeso"
+          value={fmtEur(kpi.pagamentiInSospeso)}
+          sub="da_saldare + inviata"
+          icon={Clock}
+          color="bg-amber-500"
+        />
+      </div>
+
+      {/* Activity feed */}
+      <div className="bg-white rounded-xl border border-gray-200">
+        <div className="px-5 py-4 border-b border-gray-100">
+          <h2 className="text-sm font-semibold text-gray-700">Attività recente</h2>
+        </div>
+        {activity.length === 0 ? (
+          <p className="px-5 py-8 text-sm text-gray-400 text-center">Nessuna attività recente</p>
+        ) : (
+          <ul className="divide-y divide-gray-50">
+            {activity.map((item, i) => (
+              <li key={i} className="px-5 py-3 flex items-center justify-between gap-4">
+                <div className="flex items-center gap-3">
+                  <span className="text-base">{ACTIVITY_ICONS[item.type]}</span>
+                  <div>
+                    <p className="text-sm font-medium text-gray-800">{item.label}</p>
+                    <p className="text-xs text-gray-500">{item.detail}</p>
+                  </div>
+                </div>
+                <span className="text-xs text-gray-400 shrink-0">{fmt(item.timestamp)}</span>
+              </li>
+            ))}
+          </ul>
+        )}
+      </div>
+    </div>
+  );
 }