feat: add app shortcuts to sidebar (quotes + crm leads)

- Add 'App' section in sidebar footer
- Link to 'Nuovo Preventivo' (/admin/quotes/new)
- Link to 'CRM Lead' (/admin/leads)
- Uses FileText and UserCheck icons from lucide-react
- Same styling as main nav items with active state

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

src/components/admin/AdminSidebar.tsx

@@ -11,6 +11,8 @@ import {
   TrendingUp,
   BookOpen,
   Settings,
+  FileText,
+  UserCheck,
   LogOut,
 } from "lucide-react";
 
@@ -24,6 +26,11 @@ const NAV_ITEMS = [
   { href: "/admin/impostazioni", label: "Impostazioni", icon: Settings },
 ];
 
+const APP_ITEMS = [
+  { href: "/admin/quotes/new",   label: "Nuovo Preventivo", icon: FileText },
+  { href: "/admin/leads",        label: "CRM Lead",         icon: UserCheck },
+];
+
 export function AdminSidebar() {
   const pathname = usePathname();
 
@@ -58,8 +65,34 @@ export function AdminSidebar() {
         })}
       </nav>
 
-      {/* Logout */}
+      {/* Apps */}
       <div className="px-3 py-4 border-t border-white/10">
+        <div className="text-xs font-semibold text-white/50 uppercase tracking-wider mb-3 px-3">
+          App
+        </div>
+        <div className="flex flex-col gap-0.5">
+          {APP_ITEMS.map(({ href, label, icon: Icon }) => {
+            const active = isActive(href);
+            return (
+              <Link
+                key={href}
+                href={href}
+                className={`flex items-center gap-3 px-3 py-2 rounded-md text-sm transition-colors ${
+                  active
+                    ? "bg-white/15 text-white font-medium"
+                    : "text-white/65 hover:text-white hover:bg-white/10"
+                }`}
+              >
+                <Icon size={16} strokeWidth={1.8} />
+                {label}
+              </Link>
+            );
+          })}
+        </div>
+      </div>
+
+      {/* Logout */}
+      <div className="px-3 py-3 border-t border-white/10">
         <button
           onClick={() => signOut({ callbackUrl: "/admin/login" })}
           className="flex items-center gap-3 px-3 py-2 w-full rounded-md text-sm text-white/65 hover:text-white hover:bg-white/10 transition-colors"