Warn on tab close when create-flow module or wizard edits have not been saved.

Co-authored-by: Cursor <cursoragent@cursor.com>

tests/components/FinalReviewPage.test.tsx

@@ -5,6 +5,7 @@ import {
   renderWithProviders as render,
   screen,
   waitFor,
+  dispatchBeforeUnload,
 } from "../utils/test-utils";
 import "@testing-library/jest-dom/vitest";
 import { FinalReviewScreen } from "../../app/(app)/create/screens/review/FinalReviewScreen";
@@ -623,6 +624,28 @@ describe("FinalReviewScreen — chip edit modal save semantics", () => {
     expect(latest.communicationMethodDetailsById).toBeUndefined();
   });
 
+  it("blocks tab close while chip edits are unsaved", async () => {
+    render(
+      <FinalReviewWithStateProbe
+        onState={() => {
+          /* noop */
+        }}
+        initial={baseSelections}
+      />,
+    );
+
+    fireEvent.click(await screen.findByRole("button", { name: "Signal" }));
+    const dialog = await screen.findByRole("dialog");
+    expect(dispatchBeforeUnload()).toBe(false);
+    const principleField = within(dialog).getByRole("textbox", {
+      name: /core principle/i,
+    });
+    fireEvent.change(principleField, {
+      target: { value: "Unsaved on tab close" },
+    });
+    expect(dispatchBeforeUnload()).toBe(true);
+  });
+
   it("shows consolidated placeholder for user-authored communication chips", async () => {
     const customId = "550e8400-e29b-41d4-a716-446655440000";
     render(