Better handling for incorrect characters typed in Command Mode

[nedtwigg]

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:
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