- Finalized the `ChangeMetadata` module to compute structured change metadata, replacing inline calculations in `PatchTree`.
- Introduced `DiffUtil` for accurate line difference calculations using the Myers algorithm, ensuring consistency with Git's behavior.
- Updated `DomLabel` to display git-style change indicators, including added and removed line counts, with hover tooltips for detailed information.
- Comprehensive tests for `DiffUtil` have been added to validate functionality across various scenarios.
- Removed the obsolete `WhitespaceUtil` as its functionality is now integrated into the new modules.
