Troubleshoot popup isn't reliable: please, show it whenever a failure occurs

As a first-time user of ESP and all of that, I bought an ESP32-S3-BOX-3 and went to the [HA setup tutorial](https://www.home-assistant.io/voice_control/s3_box_voice_assistant/). Long story short, the [Connect] button showed the list of entries, but anything I did only caused a warning stating `Failed to execute 'open' on 'SerialPort': Failed to open serial port.`. And that was it. Nothing else ever showed up. I obviously tried numerous things, rebooting the device, plugging three different cables on different ports, etc, as the tutorial had little information about troubleshooting on that scenario.

https://github.com/user-attachments/assets/94a4be88-7751-4fae-a2e0-fd056bbb7b85

After even some reboots, I noticed one of the browser windows was showing a troubleshooting popup with actual information! It stated I needed the missing `dialout` group on my Linux user, and that indeed solved the issue.
Trying to reproduce it, so I could report it properly here, it looks like that popup only shows up when the user cancels the port selection.

https://github.com/user-attachments/assets/83e900de-b99b-44c3-b985-192e7f8cf338

Thus, please: make that popup more reliable, by showing it as soon as any failure happens. I'll also open a separate issue with the tutorial itself so it's not reliant on the popup to help Linux users.