fix: Quick fixes for TypeScript errors (selectable, request)

frontend/src/app/admin/page.tsx

@@ -66,7 +66,7 @@ export default function AdminPage() {
   const [stats, setStats] = useState<AdminStats | null>(null)
   const [users, setUsers] = useState<AdminUser[]>([])
   const [usersTotal, setUsersTotal] = useState(0)
-  const [selectedUsers, setSelectedUsers] = useState<number[]>([])
+  // Selection removed - PremiumTable doesn't support it
   const [newsletter, setNewsletter] = useState<any[]>([])
   const [newsletterTotal, setNewsletterTotal] = useState(0)
   const [priceAlerts, setPriceAlerts] = useState<any[]>([])
@@ -330,9 +330,6 @@ export default function AdminPage() {
                 <PremiumTable
                   data={users}
                   keyExtractor={(u) => u.id}
-                  selectable
-                  selectedIds={selectedUsers}
-                  onSelectionChange={(ids) => setSelectedUsers(ids as number[])}
                   columns={[
                     {
                       key: 'user',

frontend/src/lib/api.ts

@@ -68,7 +68,7 @@ class ApiClient {
     return this.token
   }
 
-  protected async request<T>(
+  async request<T>(
     endpoint: string,
     options: RequestInit = {}
   ): Promise<T> {