chore: import upstream snapshot with attribution

apps/sim/app/(landing)/components/logo-shell/index.ts

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+export { LogoShell } from './logo-shell'

apps/sim/app/(landing)/components/logo-shell/logo-shell.tsx

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+import type { ReactNode } from 'react'
+import { cn } from '@sim/emcn'
+import Link from 'next/link'
+import { LogoMark, SimWordmark } from '@/app/(landing)/components/navbar/components'
+
+/**
+ * The canonical light, logo-only page frame - a Sim wordmark linking home, no
+ * marketing menus, on the platform's light tokens (the `light` class pins
+ * light mode regardless of visitor theme). It is the shared base for every
+ * surface that wants minimal chrome: the global 404, and the `(interfaces)`
+ * group (which adds a support footer). The `(auth)` group uses its own
+ * `AuthShell` with the same look.
+ *
+ * Children decide their own layout: pass `center` for a single centered column
+ * (404 message, simple gates); omit it for full-width content (the live chat
+ * overlay, which covers this frame entirely). An optional `footer`
+ * slot renders pinned at the bottom.
+ */
+interface LogoShellProps {
+  children: ReactNode
+  /** Center content in the viewport (for short messages / forms). Default: full-width. */
+  center?: boolean
+  /** Optional footer rendered after the content (e.g. a support footer). */
+  footer?: ReactNode
+}
+
+export function LogoShell({ children, center = false, footer }: LogoShellProps) {
+  return (
+    <div className='light relative flex min-h-screen flex-col bg-[var(--bg)] text-[var(--text-primary)]'>
+      <header>
+        <nav className='mx-auto flex w-full max-w-[1460px] items-center px-20 py-4 max-sm:px-5 max-lg:px-8'>
+          <Link href='/' aria-label='Sim home' className='flex h-[30px] items-center'>
+            <LogoMark>
+              <SimWordmark />
+            </LogoMark>
+          </Link>
+        </nav>
+      </header>
+      <main
+        className={cn('flex flex-1 flex-col', center && 'items-center justify-center px-4 pb-16')}
+      >
+        {children}
+      </main>
+      {footer}
+    </div>
+  )
+}