Feedback is delayed

### What Happened?

When I successfully join a captive network through capnet-assist, I'm redirected to the network's page telling me I'm connected (*not* https://capnet.elementary.io/). I have to manually close the window because it does not auto-close, but then 15-30 seconds later a new capnet-assist window shows up in the foreground to tell me I'm connected (this time showing https://capnet.elementary.io/). It interrupts my browsing to give me information I already have.

### Steps to Reproduce

1. Connect to a captive network through capnet-assist
2. Immediately close the window as soon as you're connected
3. Enjoy the internet
4. Get interrupted by capnet-assist opening a new window to tell you you're connected

### Expected Behavior

I think the window should be closed automatically as soon as you're connected to the network. If there is a reason for the huge delay (maybe it takes some time to detect that connection was successful) and you detected the user manually closed the window, then don't open a new one to show "You're connected": either just send a notification, or don't do anything at all because the user already figured out he's connected?

(anyway thanks for your hard work on elementary!)

### OS Version

6.x (Odin)

### Software Version

Latest release (I have run all updates)

### Log Output

_No response_

### Hardware Info

_No response_