Provide better UX when token expires #15
Description
There should be a better user experience when the access token has expired.
Currently when the token has expired and the page loads, it doesn't report anything and message simply don't appear.
Instead, a couple of things should happen:
- Proactively checking for expired tokens.
- If the token has expired, renew the token. If renewing the token isn't possible, report the issue to the user through the chat overlay with a persistent message.
- Prompt the user to obtain a new token from https://chat.nice.gg in case there's no way to renew automatically.