Status-react: No user feedback on mailserver error

[mandrigin]

Problem

When a user selects a mailserver and the connection to this mailserver is unsuccessful (state goes from :connecting to :error), we don't handle that at all.

So, essentially, after that, no error message is shown, there are no re-tries and we don't even try to request historic messages. App is essentially unusable.

Acceptance Criteria

When the mailserver connection goes to :error, show an error message to a user ("error connecting to the mailserver {mailserver_name}") and 2 buttons ("retry" and "pick another"). When user presses "pick another", navigate him to the mailserver choosing screen.

[annadanchenko]

@errorists and @yenda fyi

[errorists]

thanks @mandrigin

My immediate reaction would be to include an Alert like above

[rasom]

btw we already show the next status in the badge

but this code was broken. Anyway I will add dialog as well

[mandrigin]

@errorists oh, thank you!