Initial commit

frontend/src/components/layout/DashboardLayout.tsx

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+// Dashboard Layout Component (3-column grid)
+import { ReactNode } from 'react';
+import { clsx } from 'clsx';
+import './DashboardLayout.css';
+
+interface DashboardLayoutProps {
+  children: ReactNode;
+  className?: string;
+}
+
+export default function DashboardLayout({ children, className }: DashboardLayoutProps) {
+  return (
+    <div className={clsx('dashboard-layout', className)}>
+      {children}
+    </div>
+  );
+}
+