Version Tagging and Version Comparison Feature

Currently, the document history is automatically recorded every time it is saved. However, when multiple people are editing the document, the save timing varies for each person, making it difficult to manage the history effectively.

To improve this, it would be helpful to allow tagging specific versions in the history and to show the differences between tagged versions—similar to how the current history shows changes. This would work like tagging versions in Git and comparing the differences between them.