Show error/prompt for wifi connection in the case of network connection loss

[nbackous]

As a user, I would like to see a user-facing error if a network connection isn't active and prompt me to choose a wifi network, so I won't be stuck in the event of a network failure.

Currently, if the Candle Controller loses a network connection, the user is not shown an error indicating network has been lost or prompted to select a wifi connection. Even after a reboot this is what they see:

I encountered this myself when my 2.4GHz network failed (while 5GHz was fine) but I was unaware. Restarting my router would likely have solved the problem, but if I had seen an error on my Candle Controller I would've found the problem sooner.

[flatsiedatsie]

Indeed, thanks for creating this issue.

[flatsiedatsie]

An attempt to fix this has been made.
#71