fix(ui): keep create guardrail modal open on outside click (#29871)

The create guardrail modal used antd's default maskClosable, so clicking
outside it dismissed the modal and reset every field the user had entered.
Setting maskClosable={false} keeps the modal open; it now closes only via
the explicit close button or Cancel, matching the other form modals in the
dashboard

ui/litellm-dashboard/src/components/guardrails/add_guardrail_form.test.tsx

@@ -0,0 +1,43 @@
+import React from "react";
+import { fireEvent, screen } from "@testing-library/react";
+import { renderWithProviders } from "../../../tests/test-utils";
+import { beforeEach, describe, expect, it, vi } from "vitest";
+import AddGuardrailForm from "./add_guardrail_form";
+
+vi.mock("@/components/networking", () => ({
+  createGuardrailCall: vi.fn(),
+  getGuardrailProviderSpecificParams: vi.fn().mockResolvedValue({}),
+  getGuardrailUISettings: vi.fn().mockResolvedValue({}),
+  modelAvailableCall: vi.fn().mockResolvedValue({ data: [] }),
+}));
+
+const renderForm = () => {
+  const onClose = vi.fn();
+  renderWithProviders(<AddGuardrailForm visible={true} onClose={onClose} accessToken={null} onSuccess={vi.fn()} />);
+  return { onClose };
+};
+
+describe("AddGuardrailForm close behavior", () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+  });
+
+  it("does not close when the user clicks outside the modal on the mask", () => {
+    const { onClose } = renderForm();
+    expect(screen.getByText("Create guardrail")).toBeInTheDocument();
+
+    const wrap = document.querySelector(".ant-modal-wrap") as HTMLElement;
+    expect(wrap).toBeTruthy();
+    fireEvent.mouseDown(wrap);
+    fireEvent.mouseUp(wrap);
+    fireEvent.click(wrap);
+
+    expect(onClose).not.toHaveBeenCalled();
+  });
+
+  it("closes when the user clicks the explicit close button", () => {
+    const { onClose } = renderForm();
+    fireEvent.click(screen.getByRole("button", { name: "✕" }));
+    expect(onClose).toHaveBeenCalledTimes(1);
+  });
+});

ui/litellm-dashboard/src/components/guardrails/add_guardrail_form.tsx

@@ -1144,6 +1144,7 @@ const AddGuardrailForm: React.FC<AddGuardrailFormProps> = ({ visible, onClose, a
       title={null}
       open={visible}
       onCancel={handleClose}
+      maskClosable={false}
       footer={null}
       width={1000}
       closable={false}