UI: #334 add config page language setting (#374)

* UI: #334 add config page language setting

* temporary remove logout button

* Unify fullscreen view class for dialog expanded and settings view

- Replace dialog-expanded and settings-view with single fullscreen-view class
- Update ResponsiveDialog to use fullscreen-view class
- Update CalendarLayout to use fullscreen-view class for settings view
- Consolidate CSS rules in Menubar.styl to use fullscreen-view
- Update test cases to use new class name

---------

Co-authored-by: Lê Nhân Phụng <lenhanphung@Phung-Mac-M4.local>

__test__/features/Settings/SettingsPage.test.tsx

@@ -0,0 +1,158 @@
+import { fireEvent, screen, waitFor } from "@testing-library/react";
+import "@testing-library/jest-dom";
+import SettingsPage from "../../../src/features/Settings/SettingsPage";
+import { renderWithProviders } from "../../utils/Renderwithproviders";
+
+describe("SettingsPage", () => {
+  const preloadedState = {
+    user: {
+      userData: {
+        sub: "test",
+        email: "test@test.com",
+        family_name: "Doe",
+        name: "John",
+        sid: "mockSid",
+        openpaasId: "667037022b752d0026472254",
+      },
+    },
+    settings: {
+      language: "en",
+      view: "settings",
+    },
+  };
+
+  it("renders settings page with sidebar and content layout", () => {
+    renderWithProviders(<SettingsPage />, preloadedState);
+
+    expect(screen.getByRole("main")).toHaveClass(
+      "main-layout",
+      "settings-layout"
+    );
+  });
+
+  it("displays sidebar navigation with Settings and Notifications items", () => {
+    const { container } = renderWithProviders(<SettingsPage />, preloadedState);
+
+    // Check sidebar navigation items
+    const sidebar = container.querySelector(".settings-sidebar");
+    expect(sidebar).toBeInTheDocument();
+    expect(screen.getAllByText(/settings.title/i).length).toBeGreaterThan(0);
+    expect(screen.getByText(/settings.notifications/i)).toBeInTheDocument();
+  });
+
+  it("highlights active navigation item", () => {
+    const { container } = renderWithProviders(<SettingsPage />, preloadedState);
+
+    const settingsNavItem = container.querySelector(
+      ".settings-nav-item.active"
+    );
+    expect(settingsNavItem).toBeInTheDocument();
+  });
+
+  it("navigates back to calendar view when clicking back button", async () => {
+    const { store } = renderWithProviders(<SettingsPage />, preloadedState);
+
+    const backButton = screen.getByLabelText("settings.back");
+    fireEvent.click(backButton);
+
+    await waitFor(() => {
+      const state = store.getState();
+      expect(state.settings.view).toBe("calendar");
+    });
+  });
+
+  it("switches between Settings and Notifications tabs", () => {
+    renderWithProviders(<SettingsPage />, preloadedState);
+
+    const notificationsTab = screen.getByRole("tab", {
+      name: /settings.notifications/i,
+    });
+    fireEvent.click(notificationsTab);
+
+    expect(
+      screen.getByText(/settings.notifications.empty/i)
+    ).toBeInTheDocument();
+  });
+
+  it("displays language select in Settings tab", () => {
+    renderWithProviders(<SettingsPage />, preloadedState);
+
+    expect(
+      screen.getByLabelText("settings.languageSelector")
+    ).toBeInTheDocument();
+  });
+
+  it("displays all available language options", async () => {
+    renderWithProviders(<SettingsPage />, preloadedState);
+
+    const languageSelect = screen.getByLabelText("settings.languageSelector");
+
+    // Click on the select to open dropdown
+    fireEvent.mouseDown(languageSelect);
+
+    // Wait for menu to appear - MUI Select uses Menu internally
+    // Note: In test environment, Select may not open menu, so we verify Select exists and has correct value
+    expect(languageSelect).toBeInTheDocument();
+    expect(languageSelect).toHaveTextContent("English");
+  });
+
+  it("dispatches setLanguage action when language is changed", async () => {
+    const { store } = renderWithProviders(<SettingsPage />, preloadedState);
+
+    const languageSelect = screen.getByLabelText("settings.languageSelector");
+
+    // MUI Select uses a native input element - find and change it
+    const nativeInput = languageSelect.querySelector(
+      'input[aria-hidden="true"]'
+    ) as HTMLInputElement;
+    expect(nativeInput).toBeInTheDocument();
+
+    // Simulate change event on the native input
+    Object.defineProperty(nativeInput, "value", {
+      writable: true,
+      value: "fr",
+    });
+    fireEvent.change(nativeInput, { target: { value: "fr" } });
+
+    await waitFor(() => {
+      const state = store.getState();
+      expect(state.settings.language).toBe("fr");
+    });
+  });
+
+  it("saves language change to localStorage", async () => {
+    const { store } = renderWithProviders(<SettingsPage />, preloadedState);
+
+    const languageSelect = screen.getByLabelText("settings.languageSelector");
+
+    // MUI Select uses a native input element - find and change it
+    const nativeInput = languageSelect.querySelector(
+      'input[aria-hidden="true"]'
+    ) as HTMLInputElement;
+    expect(nativeInput).toBeInTheDocument();
+
+    // Simulate change event on the native input
+    Object.defineProperty(nativeInput, "value", {
+      writable: true,
+      value: "fr",
+    });
+    fireEvent.change(nativeInput, { target: { value: "fr" } });
+
+    await waitFor(() => {
+      expect(localStorage.getItem("lang")).toBe("fr");
+    });
+  });
+
+  it("shows empty state in Notifications tab", () => {
+    renderWithProviders(<SettingsPage />, preloadedState);
+
+    const notificationsTab = screen.getByRole("tab", {
+      name: /settings.notifications/i,
+    });
+    fireEvent.click(notificationsTab);
+
+    expect(
+      screen.getByText("settings.notifications.empty")
+    ).toBeInTheDocument();
+  });
+});