- Integrate with libkateprivate's Utils::showDiff() to use Kate's built-in
diff widget (respects user's Unified/SideBySide/Raw style preference)
- Add bundled kate-compat headers for DiffParams and Utils::showDiff decl
- CMakeLists.txt auto-detects libkateprivate, falls back to plain text diff
- Add 'Diff selected' button: shows diff for selected files with
stage/unstage/discard actions available in the diff viewer
- Add 'Diff All' button: shows git diff HEAD for full changeset review
- Staged diffs show unstage action, unstaged diffs show stage+discard
- ReloadOnShow flag keeps diff views fresh after interactive operations
Levi Neely