feat(05-03): add getClientActiveOffers query + active offers section on client detail page

- Add ClientActiveOfferSummary type to admin-queries.ts
- Add getClientActiveOffers() function joining project_offers with offer_micros
- Only selects public_name (never internal_name) per CLAUDE.md constraint
- Update /admin/clients/[id] to fetch active offers in parallel with project data
- Add Offerte Attive section at bottom of client detail page

src/app/admin/clients/[id]/page.tsx

@@ -1,5 +1,5 @@
 import { notFound } from "next/navigation";
-import { getClientWithProjects } from "@/lib/admin-queries";
+import { getClientWithProjects, getClientActiveOffers } from "@/lib/admin-queries";
 import { ClientActions } from "@/components/admin/ClientActions";
 import Link from "next/link";
 
@@ -11,7 +11,10 @@ export default async function ClientDetailPage({
   params: Promise<{ id: string }>;
 }) {
   const { id } = await params;
-  const data = await getClientWithProjects(id);
+  const [data, activeOffers] = await Promise.all([
+    getClientWithProjects(id),
+    getClientActiveOffers(id),
+  ]);
   if (!data) notFound();
 
   const { projects, ...client } = data;
@@ -105,6 +108,29 @@ export default async function ClientDetailPage({
           </div>
         </div>
       )}
+
+      {activeOffers.length > 0 && (
+        <div className="mt-8">
+          <p className="text-xs text-[#71717a] font-semibold uppercase tracking-wider mb-3">
+            Offerte Attive ({activeOffers.length})
+          </p>
+          <div className="bg-white rounded-xl border border-[#e5e7eb] divide-y divide-[#e5e7eb]">
+            {activeOffers.map((offer) => (
+              <div key={offer.offer_id} className="flex items-center justify-between px-4 py-3">
+                <div>
+                  <p className="text-sm font-medium text-[#1a1a1a]">{offer.public_name}</p>
+                  <p className="text-xs text-[#71717a]">{offer.project_name}</p>
+                </div>
+                {offer.accepted_total && (
+                  <span className="text-sm font-mono text-[#1a1a1a]">
+                    &euro;{parseFloat(offer.accepted_total).toLocaleString("it-IT", { minimumFractionDigits: 2 })}
+                  </span>
+                )}
+              </div>
+            ))}
+          </div>
+        </div>
+      )}
     </div>
   );
 }