Default width drops from 432px to 302px (~30% smaller). Long folder
names no longer ellipsize - the sidebar scrolls horizontally inside
itself when content exceeds the column width. Drag-resize and the
persisted width preference are unchanged: the user can still widen
to 40% of the content area, and that choice survives restart.
The resize handle stays anchored to the column's right edge because
it sits as a sibling of the scroll wrapper (.folder-tree-scroll),
not inside it - horizontal scroll inside the wrapper does not drag
the handle along.
cc
vicrodh
8d2cd41f88