chore: import upstream snapshot with attribution

bin/cli/tui-components/HeaderSwr.jsx

@@ -0,0 +1,25 @@
+import React, { useEffect, useState } from "react";
+import { Text } from "ink";
+
+export function HeaderSwr({ fetcher, interval = 5000, render, initial = null }) {
+  const [data, setData] = useState(initial);
+
+  useEffect(() => {
+    let cancelled = false;
+    async function tick() {
+      try {
+        const next = await fetcher();
+        if (!cancelled) setData(next);
+      } catch {}
+    }
+    tick();
+    const id = setInterval(tick, interval);
+    return () => {
+      cancelled = true;
+      clearInterval(id);
+    };
+  }, [fetcher, interval]);
+
+  if (!data) return <Text dimColor>Loading…</Text>;
+  return render(data);
+}