website refactor

apps/website/components/app/AppHeader.tsx

@@ -0,0 +1,20 @@
+import React from 'react';
+
+interface AppHeaderProps {
+  children: React.ReactNode;
+  className?: string;
+}
+
+/**
+ * AppHeader is the top control bar of the application.
+ * It follows the "Telemetry Workspace" structure.
+ */
+export function AppHeader({ children, className = '' }: AppHeaderProps) {
+  return (
+    <header 
+      className={`sticky top-0 z-50 h-16 md:h-20 bg-[#0C0D0F]/80 backdrop-blur-md border-b border-[#23272B] flex items-center px-4 md:px-6 ${className}`}
+    >
+      {children}
+    </header>
+  );
+}