debug: add notification debug component to troubleshoot iOS

components/NotificationDebug.tsx

@@ -0,0 +1,29 @@
+'use client';
+
+import { useEffect, useState } from 'react';
+
+export default function NotificationDebug() {
+  const [debug, setDebug] = useState<any>({});
+
+  useEffect(() => {
+    const info = {
+      notificationSupported: 'Notification' in window,
+      serviceWorkerSupported: 'serviceWorker' in navigator,
+      pushManagerSupported: 'PushManager' in window,
+      permission: 'Notification' in window ? Notification.permission : 'N/A',
+      localStorage: typeof localStorage !== 'undefined' ? localStorage.getItem('notification-prompt-dismissed') : 'N/A',
+    };
+    setDebug(info);
+  }, []);
+
+  return (
+    <div className="fixed bottom-4 left-4 bg-black text-white text-xs p-3 rounded-lg max-w-xs z-50 font-mono">
+      <div className="font-bold mb-2">Push Debug:</div>
+      <div>Notification: {debug.notificationSupported ? '✓' : '✗'}</div>
+      <div>ServiceWorker: {debug.serviceWorkerSupported ? '✓' : '✗'}</div>
+      <div>PushManager: {debug.pushManagerSupported ? '✓' : '✗'}</div>
+      <div>Permission: {debug.permission}</div>
+      <div>Dismissed: {debug.localStorage || 'No'}</div>
+    </div>
+  );
+}