feat: improve nextjs proxying mode

apps/public/app/test/page.tsx

@@ -0,0 +1,23 @@
+'use client';
+
+import { Button } from '@/components/ui/button';
+import { useOpenPanel } from '@openpanel/nextjs';
+
+export default function TestPage() {
+  const op = useOpenPanel();
+  return (
+    <div>
+      <h1>Test Page</h1>
+      <Button
+        onClick={async () => {
+          const deviceId = await op.fetchDeviceId();
+          alert(`Device ID: ${deviceId}`);
+        }}
+      >
+        Fetch device id
+      </Button>
+      <Button onClick={() => op.track('hello')}>Hello</Button>
+      <Button onClick={() => op.revenue(100)}>Revenue</Button>
+    </div>
+  );
+}