Redesign auth screens: split-screen layout, no boxy card

Replace the centered bordered card with a two-column auth layout shared by
login/signup/onboarding (and the rest): a branded left panel (gradient glow,
subtle grid, product pitch + feature list) and a clean, card-less form on the
right. Collapses to a single centered column with a soft glow on mobile.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

frontend/components/auth/auth-ui.tsx

@@ -1,9 +1,82 @@
+import { Check } from "lucide-react";
 import Image from "next/image";
 import type { ReactNode } from "react";
 
 import { cn } from "@/lib/utils";
 
-// Centered, branded shell shared by every auth page.
+const FEATURES = [
+  "Look up any patient just by asking",
+  "Rich record cards — vitals, labs, meds, history",
+  "Open-source, built around patient-owned data",
+];
+
+// Left brand panel (desktop only): gradient glow, product pitch, feature list.
+function BrandPanel() {
+  return (
+    <div className="relative hidden overflow-hidden border-r border-border/60 bg-[oklch(0.17_0.006_277)] p-12 lg:flex lg:flex-col lg:justify-between">
+      <div
+        aria-hidden
+        className="pointer-events-none absolute -top-32 -left-24 size-[28rem] rounded-full bg-primary/25 blur-[130px]"
+      />
+      <div
+        aria-hidden
+        className="pointer-events-none absolute -right-20 -bottom-32 size-[26rem] rounded-full bg-[oklch(0.62_0.15_305)]/20 blur-[130px]"
+      />
+      <div
+        aria-hidden
+        className="pointer-events-none absolute inset-0 opacity-[0.05]"
+        style={{
+          backgroundImage:
+            "linear-gradient(to right, white 1px, transparent 1px), linear-gradient(to bottom, white 1px, transparent 1px)",
+          backgroundSize: "44px 44px",
+          maskImage:
+            "radial-gradient(ellipse at center, black 25%, transparent 75%)",
+        }}
+      />
+
+      <div className="relative flex items-center gap-2.5">
+        <Image
+          alt="temetro"
+          className="size-8"
+          height={32}
+          priority
+          src="/temetro-logo.png"
+          width={32}
+        />
+        <span className="text-lg font-semibold tracking-tight">temetro</span>
+      </div>
+
+      <div className="relative max-w-md space-y-5">
+        <h2 className="text-balance text-3xl font-semibold leading-tight tracking-tight">
+          Patient records, organized by conversation.
+        </h2>
+        <p className="text-pretty text-muted-foreground">
+          The AI middleman between you and patient data — retrieve, review and
+          update charts from a simple chat, so you spend less time clicking.
+        </p>
+        <ul className="space-y-3 pt-2">
+          {FEATURES.map((feature) => (
+            <li
+              className="flex items-center gap-3 text-sm text-foreground/90"
+              key={feature}
+            >
+              <span className="flex size-5 shrink-0 items-center justify-center rounded-full bg-primary/15 text-primary">
+                <Check className="size-3.5" />
+              </span>
+              {feature}
+            </li>
+          ))}
+        </ul>
+      </div>
+
+      <div className="relative text-xs text-muted-foreground">
+        © temetro — open-source clinical tooling
+      </div>
+    </div>
+  );
+}
+
+// Centered, branded shell shared by every auth page (split layout on desktop).
 export function AuthShell({
   title,
   subtitle,
@@ -16,32 +89,40 @@ export function AuthShell({
   footer?: ReactNode;
 }) {
   return (
-    <div className="flex min-h-full w-full flex-col items-center justify-center px-4 py-12">
-      <div className="w-full max-w-sm">
-        <div className="mb-8 flex flex-col items-center gap-3 text-center">
-          <Image
-            alt="temetro"
-            className="size-10"
-            height={40}
-            priority
-            src="/temetro-logo.png"
-            width={40}
-          />
-          <div>
-            <h1 className="text-xl font-semibold tracking-tight">{title}</h1>
+    <div className="grid min-h-full lg:grid-cols-2">
+      <BrandPanel />
+
+      <div className="relative flex items-center justify-center px-6 py-12">
+        {/* soft glow behind the form on small screens (no brand panel) */}
+        <div
+          aria-hidden
+          className="pointer-events-none absolute inset-0 overflow-hidden lg:hidden"
+        >
+          <div className="absolute -top-24 left-1/2 size-72 -translate-x-1/2 rounded-full bg-primary/15 blur-[120px]" />
+        </div>
+
+        <div className="relative w-full max-w-sm">
+          <div className="mb-8">
+            <Image
+              alt="temetro"
+              className="mb-6 size-9 lg:hidden"
+              height={36}
+              priority
+              src="/temetro-logo.png"
+              width={36}
+            />
+            <h1 className="text-2xl font-semibold tracking-tight">{title}</h1>
             {subtitle && (
-              <p className="mt-1.5 text-sm text-muted-foreground">{subtitle}</p>
+              <p className="mt-2 text-sm text-muted-foreground">{subtitle}</p>
             )}
           </div>
-        </div>
-        <div className="rounded-3xl border border-border bg-card/40 p-6 shadow-sm">
+
           {children}
+
+          {footer && (
+            <div className="mt-8 text-sm text-muted-foreground">{footer}</div>
+          )}
         </div>
-        {footer && (
-          <div className="mt-6 text-center text-sm text-muted-foreground">
-            {footer}
-          </div>
-        )}
       </div>
     </div>
   );