ascii-box-aligner

Create a Markdown Editor Utility named 'MarkdownBoxAligner' using Python that leverages the 'ascii-box-aligner' package. This utility will enable users to write and edit Markdown files containing ASCII box drawings, ensuring that these diagrams are properly aligned, especially when dealing with CJK (Chinese, Japanese, Korean) characters and nested boxes.

### Core Functionality:
- **File Input/Output:** Users should be able to open existing Markdown files or create new ones within the utility.
- **Real-time Alignment:** As users type or paste ASCII box drawings into the editor, the utility should automatically align them according to the rules specified by the 'ascii-box-aligner' package.
- **CJK Character Support:** The utility must handle CJK characters seamlessly within the box drawings, ensuring they are centered or left/right-aligned as needed.
- **Nested Box Handling:** The utility should correctly align nested boxes within larger box structures.

### Additional Features:
- **Preview Mode:** A preview pane that shows how the final Markdown file would look when rendered.
- **Save & Export Options:** Save the edited Markdown file back to disk, or export it as HTML for easy viewing.
- **Help Documentation:** Built-in help documentation explaining common issues and best practices for creating ASCII box drawings in Markdown.

### Utilization of 'ascii-box-aligner':
- Integrate 'ascii-box-aligner' to automatically detect and align ASCII box drawings whenever changes are made in the editor.
- Use the package's CJK and nesting capabilities to ensure high-quality alignment of complex diagrams.
- Implement a feature that allows users to manually trigger a re-alignment of the entire document if needed.

This project aims to simplify the creation and editing of Markdown documents containing ASCII box drawings, making it easier for developers and writers to produce well-formatted content.