#11769 improved the lexical version view diff component. This PR improves the rest of the version view. ## What changed - Column layout when selecting a version: - Previously: Selected version on the left, latest version on the left - Now: Previous version on the left, previous version on the right (mimics behavior of GitHub) - Locale selector now displayed in pill selector, rather than react-select - Smoother, more reliable locale, modifiedOnly and version selection. Now uses clean event callbacks rather than useEffects - React-diff-viewer-continued has been replaced with the html differ we use in lexical - Updated Design for all field diffs - Version columns now have a clearly defined separator line - Fixed collapsibles showing in version view despite having no modified fields if modifiedOnly is true - New, redesigned header ## Screenshots ### Before   ### After    