v1.5.7: fix Settings system tab crash and OffersTemplates tab gap

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/admin/pages/OffersTemplates.tsx

@@ -71,7 +71,7 @@ export default function OffersTemplates() {
         </div>
       </motion.div>
 
-      <div className="admin-tabs">
+      <div className="admin-tabs mb-4">
         <button
           className={`admin-tab ${activeTab === "items" ? "active" : ""}`}
           onClick={() => setActiveTab("items")}