Add comprehensive Storybook stories for authentication components with Storybook 9 compatibility

components/AuthUI/AuthUI.stories.tsx

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+import { Meta, StoryObj } from "@storybook/nextjs-vite";
+import { HttpResponse, http } from "msw";
+import AuthUI from "@/components/AuthUI/AuthUI";
+import { User } from "@/src/api/generated";
+import { mockFirebaseUser, useFirebaseUser } from "@/src/hooks/useFirebaseUser.mock";
+import { CAPI } from "@/src/mocks/apibase";
+import { handlers } from "@/src/mocks/handlers";
+
+const meta = {
+  title: "Components/AuthUI/SignIn",
+  component: AuthUI,
+  parameters: {
+    layout: "fullscreen",
+    backgrounds: { default: "dark" },
+    msw: {
+      handlers: handlers,
+    },
+  },
+  decorators: [
+    (Story) => (
+      <div className="bg-gray-900 min-h-screen">
+        <Story />
+      </div>
+    ),
+  ],
+} satisfies Meta<typeof AuthUI>;
+
+export default meta;
+
+type Story = StoryObj<typeof meta>;
+
+// Mock user data
+const mockUser: User = {
+  id: "user-123",
+  name: "John Doe",
+  email: "john.doe@example.com",
+  isAdmin: false,
+  isApproved: true,
+};
+
+export const Default: Story = {
+  parameters: {
+    msw: {
+      handlers: [
+        http.get(CAPI("/users"), () => HttpResponse.json(null, { status: 401 })),
+        ...handlers,
+      ],
+    },
+  },
+  async beforeEach() {
+    // Mock Firebase user as logged out
+    useFirebaseUser.mockReturnValue([null, false, undefined]);
+  },
+};
+
+export const Loading: Story = {
+  parameters: {
+    msw: {
+      handlers: [
+        http.get(CAPI("/users"), () => HttpResponse.json(null, { status: 401 })),
+        ...handlers,
+      ],
+    },
+  },
+  async beforeEach() {
+    // Mock Firebase user as loading
+    useFirebaseUser.mockReturnValue([null, true, undefined]);
+  },
+};
+
+export const AlreadyLoggedIn: Story = {
+  parameters: {
+    msw: {
+      handlers: [http.get(CAPI("/users"), () => HttpResponse.json(mockUser)), ...handlers],
+    },
+  },
+  async beforeEach() {
+    // Mock Firebase user as logged in
+    useFirebaseUser.mockReturnValue([mockFirebaseUser, false, undefined]);
+  },
+};

components/AuthUI/Logout.stories.tsx

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+import { Meta, StoryObj } from "@storybook/nextjs-vite";
+import { HttpResponse, http } from "msw";
+import Logout from "@/components/AuthUI/Logout";
+import { User } from "@/src/api/generated";
+import { mockFirebaseUser, useFirebaseUser } from "@/src/hooks/useFirebaseUser.mock";
+import { CAPI } from "@/src/mocks/apibase";
+import { handlers } from "@/src/mocks/handlers";
+
+const meta = {
+  title: "Components/AuthUI/Logout",
+  component: Logout,
+  parameters: {
+    layout: "fullscreen",
+    backgrounds: { default: "dark" },
+    msw: {
+      handlers: handlers,
+    },
+  },
+  decorators: [
+    (Story) => (
+      <div className="bg-gray-900 min-h-screen">
+        <Story />
+      </div>
+    ),
+  ],
+} satisfies Meta<typeof Logout>;
+
+export default meta;
+
+type Story = StoryObj<typeof meta>;
+
+// Mock user data
+const mockUser: User = {
+  id: "user-123",
+  name: "John Doe",
+  email: "john.doe@example.com",
+  isAdmin: false,
+  isApproved: true,
+};
+
+export const Default: Story = {
+  parameters: {
+    msw: {
+      handlers: [http.get(CAPI("/users"), () => HttpResponse.json(mockUser)), ...handlers],
+    },
+  },
+  async beforeEach() {
+    // Mock Firebase user as logged in
+    useFirebaseUser.mockReturnValue([mockFirebaseUser, false, undefined]);
+  },
+};
+
+export const LoggedOut: Story = {
+  parameters: {
+    msw: {
+      handlers: [
+        http.get(CAPI("/users"), () => HttpResponse.json(null, { status: 401 })),
+        ...handlers,
+      ],
+    },
+  },
+  async beforeEach() {
+    // Mock Firebase user as logged out
+    useFirebaseUser.mockReturnValue([null, false, undefined]);
+  },
+};