Add the split-screen auth shell and its card components

web/frontend/app/features/auth/components/AuthCardHeading.tsx

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+interface AuthCardHeadingProps {
+    title: string;
+    subtitle: string;
+}
+
+const AuthCardHeading = ({ title, subtitle }: AuthCardHeadingProps) => (
+    <div className="flex flex-col gap-1.5">
+        <h1 className="text-[1.875rem]">{title}</h1>
+        <p className="text-[var(--color-muted)]">{subtitle}</p>
+    </div>
+);
+
+export default AuthCardHeading;

web/frontend/app/features/auth/components/AuthErrorAlert.tsx

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+interface AuthErrorAlertProps {
+    message: string;
+}
+
+const AuthErrorAlert = ({ message }: AuthErrorAlertProps) => (
+    <div role="alert" className="alert alert-error alert-soft">
+        <span>{message}</span>
+    </div>
+);
+
+export default AuthErrorAlert;

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

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+import barBackground from '../../../assets/bar-background.jpg';
+
+interface AuthSplitLayoutProps {
+    headline: string;
+    blurb: string;
+    children: React.ReactNode;
+}
+
+const AuthSplitLayout = ({ headline, blurb, children }: AuthSplitLayoutProps) => (
+    <div className="relative flex flex-1 bg-base-200">
+        <div
+            className="absolute inset-0 bg-base-300 bg-cover bg-center"
+            style={{ backgroundImage: `url(${barBackground})` }}
+        />
+
+        {/* Darkens the photo from the bottom up so the white hero text stays legible */}
+        <div className="pointer-events-none absolute inset-0 bg-[linear-gradient(0deg,#000000b3_30%,#ffffff44_100%)]" />
+
+        <div className="relative mx-auto grid w-full max-w-7xl grid-cols-1 content-between gap-6 min-[820px]:grid-cols-[minmax(0,6fr)_minmax(0,5fr)]">
+            <section className="flex flex-col justify-end gap-4 px-5 pt-8 pb-2 text-white min-[820px]:px-10 min-[820px]:py-14">
+                <h2 className="text-[2rem] leading-[1.1] text-balance [text-shadow:0_2px_24px_#0006] min-[820px]:text-[3.25rem]">
+                    {headline}
+                </h2>
+
+                <p className="max-w-[27.5rem] text-base leading-[1.5] min-[820px]:text-[1.1875rem]">
+                    {blurb}
+                </p>
+            </section>
+
+            <main className="flex items-center justify-center px-4 pt-4 pb-7 min-[820px]:py-10 min-[820px]:pr-10 min-[820px]:pl-0">
+                <div className="flex w-full max-w-[27.5rem] flex-col gap-4 rounded-box bg-base-100 px-5 py-6 shadow-[0_20px_50px_#0005] min-[820px]:p-8">
+                    {children}
+                </div>
+            </main>
+        </div>
+    </div>
+);
+
+export default AuthSplitLayout;

web/frontend/app/features/auth/components/AuthSwitchPrompt.tsx

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+import { Link } from 'react-router';
+
+interface AuthSwitchPromptProps {
+    lead: string;
+    to: string;
+    label: string;
+}
+
+const AuthSwitchPrompt = ({ lead, to, label }: AuthSwitchPromptProps) => (
+    <p className="text-center text-[0.9375rem] text-[var(--color-muted)]">
+        {lead}{' '}
+        <Link to={to} className="font-semibold text-secondary hover:text-primary">
+            {label}
+        </Link>
+    </p>
+);
+
+export default AuthSwitchPrompt;

web/frontend/app/features/auth/components/ShowPasswordToggle.tsx

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+import { Button } from '@headlessui/react';
+
+interface ShowPasswordToggleProps {
+    shown: boolean;
+    onToggle: () => void;
+}
+
+const ShowPasswordToggle = ({ shown, onToggle }: ShowPasswordToggleProps) => (
+    <Button
+        type="button"
+        onClick={onToggle}
+        className="inline-flex min-h-11 items-center self-start text-[0.9375rem] font-semibold text-secondary hover:underline"
+    >
+        {shown ? 'Hide password' : 'Show password'}
+    </Button>
+);
+
+export default ShowPasswordToggle;