Inconsistent log content when separating Katharsis output streams

[kurosakishigure]

Katharsis Version

1.0.0-canary.14

System Version

macOS 15.2

To Reproduce

1. Run the following command:

   katharsis >> out.log 2>> error.log

Expected Behavior

// error.log

- parse: alpha.html
  - warn: ...
- parse: beta.html
  - warn: ...

Actual Behavior

// error.log

  - warn: title element not found
  - warn: title element not found

Additional Information

We might also need to display a warning when the article.input field in katharsis.config.toml doesn't reference any files. Should we consider setting up a dedicated logging module for this purpose🤔