Run filename.js with nodejs editor shortcut

An option in the Editor that is like "Open filename.js in Browser" and another for "Run filename.js with nodejs" (automatically types out the command in terminal).

- Would require a list of known types + applications

- Just write to the pty but omit the return key at the end so the demonstrator can "hit enter" at exactly the right time

Start by locating the Editor shortcut handling and the terminal pty entry point. Review how the existing “Open filename.js in Browser” action works, then identify how filename types map to applications. Done means the editor can prepare the nodejs command in the terminal without sending the final return key.

Written by the indexing model from the issue text.