Refactor `getDataEntryAsHtml` method in ZettelkastenView class

[RalfBarkow]

The getDataEntryAsHtml method in the ZettelkastenView class is responsible for converting data to HTML format. While this functionality is essential for rendering data, it might not align well with the responsibilities of the ZettelkastenView class, which should primarily focus on managing the user interface and interactions. To improve code organization, maintainability, and testability, it's recommended to refactor this method into its own class responsible for data transformation or presentation logic.

Proposed Changes:

1. Extract the getDataEntryAsHtml method into a new class, possibly named DataHtmlConverter or similar, dedicated to data-to-HTML conversion.
2. Update the ZettelkastenView class to delegate the data-to-HTML conversion task to the newly created DataHtmlConverter class.
3. Ensure that the refactoring does not introduce any functional changes and that the behavior of the application remains consistent.
4. Update any relevant documentation or comments to reflect the changes.

Benefits:

1. Better adherence to the Single Responsibility Principle (SRP) by separating concerns related to data transformation from those related to managing the view.
2. Improved code organization, making it easier to understand and maintain the codebase.
3. Enhanced testability by isolating the data-to-HTML conversion logic, allowing for more focused unit testing.
4. Increased flexibility and reusability of the HTML generation logic, enabling its use in other parts of the application if needed.

Additional Notes: Feel free to discuss any concerns or suggestions related to this refactoring. Collaboration and feedback are welcome!

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