Website: Next.js app for accounts, linking, who's online, device sign-in and the console

apps/web: Next.js 16 (App Router), Tailwind 4 and shadcn/ui, light and dark from the system. Pages render on the
server and call the API with Eden Treaty (typed by @t5de/api), forwarding the visitor's cookie; forms use server
actions; sign-up, sign-in and sign-out use Better Auth's React client. /api is rewritten to the API so its cookies
are first-party. Who's online follows the API's event stream (Next's gzip is off: it held the stream back).
Standalone output with a Dockerfile; deploys to Vercel as is.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

apps/web/app/not-found.tsx

@@ -0,0 +1,13 @@
+import Link from "next/link";
+import { NarrowCard } from "@/components/narrow-card";
+import { buttonVariants } from "@/components/ui/button";
+
+export default function NotFound() {
+  return (
+    <NarrowCard title="Not found" description="There's nothing at this address.">
+      <Link href="/" className={buttonVariants({ variant: "outline" })}>
+        Home
+      </Link>
+    </NarrowCard>
+  );
+}