Marketing route group, layout, typography setup

app/(marketing)/layout.tsx

@@ -0,0 +1,22 @@
+/**
+ * Marketing Layout
+ * 
+ * Full-width layout without sidebar for marketing pages.
+ * Navigation will be added in E1.M5.S1.
+ */
+
+import type { ReactNode } from 'react'
+
+interface MarketingLayoutProps {
+  children: ReactNode
+}
+
+export default function MarketingLayout({ children }: MarketingLayoutProps) {
+  return (
+    <div className="min-h-screen bg-white">
+      {/* Navigation will be added in E1.M5.S1 */}
+      {children}
+    </div>
+  )
+}
+