- Wider invisible hit area around dividers (visible line drawn via CSS
::after pseudo-element) for easier grabbing
- Persist split ratios in layout snapshots so resized panes survive
tab switches and restores
- Double-click divider to equalize sibling panes
- Notify onLayoutChanged after drag-end to trigger ratio persistence
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>