사이드바 접기 기능 추가

adminfront/src/components/layout/AppLayout.test.tsx

@@ -127,6 +127,22 @@ describe("admin AppLayout", () => {
     expect(worksmobileIcon.querySelector('path[fill="white"]')).toBeNull();
   });
 
+  it("toggles the sidebar and persists the collapsed state", async () => {
+    renderLayout();
+
+    const collapseButton = await screen.findByRole("button", {
+      name: "사이드바 접기",
+    });
+    fireEvent.click(collapseButton);
+
+    expect(window.localStorage.getItem("baron_shell_sidebar_collapsed")).toBe(
+      "true",
+    );
+    expect(
+      screen.getByRole("button", { name: "사이드바 펼치기" }),
+    ).toBeInTheDocument();
+  });
+
   it("opens profile menu, navigates, toggles theme/session, and logs out", async () => {
     renderLayout();