Add initial Portal version

src/components/ui/card.tsx

@@ -0,0 +1,37 @@
+export function Card({
+  children,
+  className = "",
+  interactive = false,
+}: {
+  children: React.ReactNode;
+  className?: string;
+  interactive?: boolean;
+}) {
+  return (
+    <div
+      className={`
+        rounded-xl border border-border bg-surface-1 p-6
+        ${interactive ? "card-interactive cursor-pointer" : ""}
+        ${className}
+      `}
+    >
+      {children}
+    </div>
+  );
+}
+
+export function CardHeader({
+  children,
+  className = "",
+}: {
+  children: React.ReactNode;
+  className?: string;
+}) {
+  return (
+    <h3
+      className={`text-xs font-semibold uppercase tracking-wider text-text-muted mb-3 ${className}`}
+    >
+      {children}
+    </h3>
+  );
+}