Add organization members management components and tests

- Implemented `OrganizationMembersContent`, `OrganizationMembersTable`, and `AddMemberDialog` components for organization members management.
- Added unit tests for `OrganizationMembersContent` and `OrganizationMembersTable`, covering rendering, state handling, and edge cases.
- Enhanced `useOrganizationMembers` and `useGetOrganization` hooks to support members list and pagination data integration.
- Updated E2E tests to include organization members page interactions and improved reliability.

frontend/src/app/admin/organizations/[id]/members/page.tsx

@@ -0,0 +1,43 @@
+/**
+ * Admin Organization Members Page
+ * Displays and manages members of a specific organization
+ * Protected by AuthGuard in layout with requireAdmin=true
+ */
+
+/* istanbul ignore next - Next.js type import for metadata */
+import type { Metadata } from 'next';
+import Link from 'next/link';
+import { ArrowLeft } from 'lucide-react';
+import { Button } from '@/components/ui/button';
+import { OrganizationMembersContent } from '@/components/admin/organizations/OrganizationMembersContent';
+
+/* istanbul ignore next - Next.js metadata, not executable code */
+export const metadata: Metadata = {
+  title: 'Organization Members',
+};
+
+interface PageProps {
+  params: {
+    id: string;
+  };
+}
+
+export default function OrganizationMembersPage({ params }: PageProps) {
+  return (
+    <div className="container mx-auto px-6 py-8">
+      <div className="space-y-6">
+        {/* Back Button */}
+        <div className="flex items-center gap-4">
+          <Link href="/admin/organizations">
+            <Button variant="outline" size="icon" aria-label="Back to Organizations">
+              <ArrowLeft className="h-4 w-4" aria-hidden="true" />
+            </Button>
+          </Link>
+        </div>
+
+        {/* Organization Members Content */}
+        <OrganizationMembersContent organizationId={params.id} />
+      </div>
+    </div>
+  );
+}