- Remove absolute positioning from rightArea, use flex:1 1 0 flow layout
- Move titleLine (filename+badges) to leftArea in compare mode for 3-column layout
- Mirror paddingLeft=84px to match paddingRight in compare mode for symmetry
- centerArea flex:0 0 auto in compare so mode buttons stay centered
- Export leftArea, centerArea, titleLine, titleWrap, modeButtons from toolbar
- Add overflow:hidden to left/right meta and areas for text truncation