docs[nextjs-push]: add screenshot before next steps

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: maratal

src/images/content/screenshots/getting-started/nextjs-push-getting-started-guide.png

@@ -520,6 +520,25 @@ Add the three send buttons to the JSX inside the buttons `div`:
 ```
 </Code>
 
+Now you can send push notifications to your device, client, or channel using the buttons in the UI:
+
+![Screenshot of the Next.js push tutorial application showing push notifications received](../../../../images/content/screenshots/getting-started/nextjs-push-getting-started-guide.png)
+
+## Browser compatibility <a id="browser-compatibility"/>
+
+Web Push notification support varies across browsers:
+
+| Feature | Chrome/Edge | Firefox | Safari |
+|---|---|---|---|
+| Push API | Full support | Full support | Partial (macOS 13+) |
+| Service Worker | Full support | Full support | Full support |
+| Notification actions (buttons) | Supported | Limited | Not supported |
+| Silent push | Supported | Supported | Not supported |
+
+<Aside data-type="note">
+Safari on macOS 13+ supports Web Push, but with some limitations. Notification action buttons are not supported in Safari or Firefox on macOS.
+</Aside>
+
 ## Next steps <a id="next-steps"/>
 
 * Understand [token authentication](/docs/auth/token) before going to production.