- Added new indirect dependencies: `github.com/JohannesKaufmann/dom` and `github.com/JohannesKaufmann/html-to-markdown/v2` for improved HTML processing.
- Updated `github.com/sergi/go-diff` to version 1.4.0 for enhanced diff functionality.
- Modified the `buildEmailBody` function to return both HTML and plain text versions of the email body, improving email formatting capabilities.
- Adjusted the default email channel name in configuration to "default" for better clarity.