Better handling for incorrect characters typed in Command Mode

Story:
- user is in command mode
- user attempts to type into the terminal
- probably the first character isn't a shortcut, but pretty quick they stumble into one, and a surprising shortcut action takes place
- all the destructive ones have confirm screens, so little risk of a big problem, but it's not great

Possible better answer:
- when a wrong character is typed, a modal pops up

```
That's not a shortcut!
Press [Enter] if you meant to type into the terminal in PASSTHROUGH mode
Press [Esc] to return to COMMAND mode

Recognized shortcuts are:

```