Cover the split-screen auth layout in Storybook

web/frontend/app/features/auth/components/AuthSplitLayout.stories.tsx

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+import { zodResolver } from '@hookform/resolvers/zod';
+import type { Meta, StoryObj } from '@storybook/react-vite';
+import { useForm } from 'react-hook-form';
+import { expect, within } from 'storybook/test';
+import AuthSplitLayout from './AuthSplitLayout';
+import AuthSwitchPrompt from './AuthSwitchPrompt';
+import LoginForm from './LoginForm';
+import RegisterForm from './RegisterForm';
+import { loginSchema, registerSchema, type LoginSchema, type RegisterSchema } from '../schemas';
+
+const authSplitLayoutDescription = `The shared split-screen shell behind /login and /register: a brand panel carrying the headline and a form panel that centers the page's own heading, form, and switch prompt. Both stories compose the real forms, so they show the production layout at any viewport.`;
+
+const LoginPanel = () => {
+    const form = useForm<LoginSchema>({ resolver: zodResolver(loginSchema) });
+
+    return (
+        <div className="flex w-full max-w-[25rem] flex-col gap-4">
+            <div className="flex flex-col gap-1.5">
+                <h1 className="text-[2.125rem]">Sign in</h1>
+                <p className="text-[var(--color-muted)]">Sign in to your Biergarten account</p>
+            </div>
+
+            <LoginForm
+                onSubmit={form.handleSubmit(() => {})}
+                formState={form.formState}
+                register={form.register}
+                submitting={false}
+            />
+
+            <AuthSwitchPrompt lead="New to Biergarten?" to="/register" label="Create an account" />
+        </div>
+    );
+};
+
+const RegisterPanel = () => {
+    const form = useForm<RegisterSchema>({ resolver: zodResolver(registerSchema) });
+
+    return (
+        <div className="flex w-full max-w-[32.5rem] flex-col gap-4">
+            <div className="flex flex-col gap-1.5">
+                <h1 className="text-[2.125rem]">Create your account</h1>
+                <p className="text-[var(--color-muted)]">Create your Biergarten account</p>
+            </div>
+
+            <RegisterForm
+                onSubmit={form.handleSubmit(() => {})}
+                formState={form.formState}
+                register={form.register}
+                submitting={false}
+            />
+
+            <AuthSwitchPrompt lead="Already have an account?" to="/login" label="Sign in" />
+        </div>
+    );
+};
+
+const meta = {
+    title: 'Layout/AuthSplitLayout',
+    component: AuthSplitLayout,
+    tags: ['autodocs'],
+    parameters: {
+        layout: 'fullscreen',
+        docs: {
+            description: {
+                component: authSplitLayoutDescription,
+            },
+        },
+    },
+} satisfies Meta<typeof AuthSplitLayout>;
+
+export default meta;
+type Story = StoryObj<typeof meta>;
+
+export const Login: Story = {
+    args: {
+        headline: 'Good to see you again.',
+        blurb: 'Sign in to pick up where you left off with our partner breweries.',
+        children: <LoginPanel />,
+    },
+    play: async ({ canvasElement }) => {
+        const canvas = within(canvasElement);
+        await expect(canvas.getByRole('heading', { name: 'Sign in' })).toBeInTheDocument();
+        await expect(canvas.getByRole('button', { name: /show password/i })).toBeInTheDocument();
+    },
+};
+
+export const Register: Story = {
+    args: {
+        headline: 'Pull up a chair.',
+        blurb: 'Create an account to explore partner breweries and their beers.',
+        children: <RegisterPanel />,
+    },
+    play: async ({ canvasElement }) => {
+        const canvas = within(canvasElement);
+        await expect(canvas.getByLabelText(/date of birth/i)).toBeInTheDocument();
+        await expect(canvas.getByRole('button', { name: /create account/i })).toBeInTheDocument();
+    },
+};
+
+export const RegisterMobile: Story = {
+    args: Register.args,
+    parameters: {
+        viewport: {
+            defaultViewport: 'mobile1',
+        },
+    },
+};