minor internal-eval fixes

[onerandomusername]

There are a few issues within the new eval command before it can be deployed.

• [x] sys.ps1 is not defined. Darn typecheckers.
• [ ] Files in components v2 are never previewed in the client. They should be.
• [x] ANSI processing by Discord sometimes conks out.
• [x] include tracebacks in errors

To fix the first one, it should be turned into a constant at the top of the file >>> without a trailing space.

For the second one, this requires particular design.

We cannot provide files and components v2 at the same time.