fix: clear prefix for message() and error()

[tigarmo]

The first commit fixes a bug I bumped into where an emit.progress() followed by an emit.message() would send the carriage return (to clear the ephemeral progress) to the wrong stream. The second commit then does the actual clearing of the prefix.

Fixes #202

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (bbff5f5) 93.13% compared to head (917fa5f) 94.76%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #203 +/- ## ========================================== + Coverage 93.13% 94.76% +1.63% ========================================== Files 7 7 Lines 1063 1070 +7 Branches 194 197 +3 ========================================== + Hits 990 1014 +24 + Misses 66 53 -13 + Partials 7 3 -4 ```

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