feat(05-02): /admin/offers RSC page + ServiceCheckboxList + NavBar update

- Create src/app/admin/offers/page.tsx — RSC with macro/micro/service CRUD sections
- Create src/components/admin/offers/ServiceCheckboxList.tsx — client checkbox UI for service-to-micro assignment
- Update src/components/admin/NavBar.tsx — add Forecast and Offerte links (order: Statistiche | Forecast | Catalogo | Offerte | Impostazioni)

src/components/admin/NavBar.tsx

@@ -18,9 +18,15 @@ export function NavBar() {
         <Link href="/admin/analytics" className="text-sm text-white/70 hover:text-white transition-colors">
           Statistiche
         </Link>
+        <Link href="/admin/forecast" className="text-sm text-white/70 hover:text-white transition-colors">
+          Forecast
+        </Link>
         <Link href="/admin/catalog" className="text-sm text-white/70 hover:text-white transition-colors">
           Catalogo
         </Link>
+        <Link href="/admin/offers" className="text-sm text-white/70 hover:text-white transition-colors">
+          Offerte
+        </Link>
         <Link href="/admin/impostazioni" className="text-sm text-white/70 hover:text-white transition-colors">
           Impostazioni
         </Link>

src/components/admin/offers/ServiceCheckboxList.tsx

@@ -0,0 +1,51 @@
+"use client";
+
+import { useState, useTransition } from "react";
+import { useRouter } from "next/navigation";
+import { updateMicroOfferServices } from "@/app/admin/offers/actions";
+
+export function ServiceCheckboxList({
+  allServices,
+  assignedIds,
+  microId,
+}: {
+  allServices: Array<{ id: string; name: string; price: string }>;
+  assignedIds: string[];
+  microId: string;
+}) {
+  const [selected, setSelected] = useState(new Set(assignedIds));
+  const [isPending, startTransition] = useTransition();
+  const router = useRouter();
+
+  function toggle(serviceId: string) {
+    const next = new Set(selected);
+    if (next.has(serviceId)) next.delete(serviceId);
+    else next.add(serviceId);
+    setSelected(next);
+    startTransition(async () => {
+      await updateMicroOfferServices(microId, [...next]);
+      router.refresh();
+    });
+  }
+
+  return (
+    <div className="space-y-1">
+      {allServices.map((svc) => (
+        <label key={svc.id} className="flex items-center gap-2 cursor-pointer text-sm">
+          <input
+            type="checkbox"
+            checked={selected.has(svc.id)}
+            onChange={() => toggle(svc.id)}
+            disabled={isPending}
+            className="rounded"
+          />
+          <span>{svc.name}</span>
+          <span className="ml-auto text-xs text-[#71717a]">€{parseFloat(svc.price).toFixed(2)}</span>
+        </label>
+      ))}
+      {allServices.length === 0 && (
+        <p className="text-xs text-[#71717a]">Nessun servizio nel catalogo ancora.</p>
+      )}
+    </div>
+  );
+}