Connection status

this includes:
- the log indicator should always be there. it can say "No log entries yet" until something has been logged
- when green, it should be a "?"
- when red, should be a "!"
- when executing a command it should show the connection indicator, which should switch to activity indicator (success or failed) once the command was executed
- when default API URL, the popup should show the message about it and after clicking OK to close the popup it should redirect you to the connection page to update the URL