- Added line hashes to compact diff preview for unchanged and added lines to enable integrity verification.
- Modified compact diff preview to track line number synchronization between old and new files when processing insertions and deletions.
- Fixed line number parsing in compact diff preview to handle variable-width line number fields with leading whitespace.
- Extracted parsing and formatting logic into dedicated functions (parseNumberedDiffLine, formatCompactHashlineLine, syncOldLineCounters, syncNewLineCounters) for maintainability.
- Updated 4 test cases to verify line hash generation, line number synchronization, and handling of variable-width fields.
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