In the modal Local Changes view (Git tool window), double-click and Enter always opened the diff. `openNode` in `CommitView.tsx` ignored the commit interface. The modal view now opens the source file and the non-modal Commit tool window keeps the diff. A new `vcs.commit.doubleClickOpensDiff` setting (unset = follow the interface) is exposed as Show on Double-Click → Source / Diff / Follow the Interface.
Co-authored-by: aconeshana <52204454+aconeshana@users.noreply.github.com>
