`indent_wrap` Improvements Needed

- Needs to handle non-printing characters (by not counting them).
- Should indent if a newline is included in the message.

Locate the `indent_wrap` implementation and any existing tests; the issue names no files or test cases. Check how non-printing characters and embedded newlines are currently handled, then add coverage showing that they are excluded from width counting and that multiline messages are indented.

Written by the indexing model from the issue text.