Improve flashing and reboot user feedback

[petrn]

I have different devices with OTA functionality and thus I can see how different products have implemented user feedback during OTA. What would be great to add to ESPKVM would be a timer running inside the console which implements a visible countdown for the period the activity typically takes - like the flashing and reboot. At the moment you do see that the system is flashing, but it should be the case that the flashing takes roughly the same time every time, so the console might be able to either show a progress bar or count down for the flash progress simply based on time, not on any feedback from the device. The same about the reboot - a healthy reboot should take a fixed amount of time and a recovery reboot should also take a fixed amount of time. The same feedback can be given both for the OTA reboot and the other forms of manual reboot (from Settings or from the buttons in the firmware widget).

Once the known time is over, you can indicate that the system was expected to finish but it did not. Examples of these procedures are the pfSense firewall (FreeBSD based) and the Shelly remote power switches (ESP based), I can show a video of their OTA if you cannot understand the process from my description.

[dexif]

Yes - this is exactly what I am working on right now, and I will try to have it in the next release.

[dexif]

[petrn]

I have tried this while upgrading from 0.29.0 to 0.30.0 and the restart is working fine, but the flashing does not count down and the dots do not animate, there is a frozen picture all the period and it starts to change only when it hits the reboot phase.

[dexif]

Fixed