This one’s a full redesign, not a coat of paint: a distinct dark sidebar, sharper type throughout, and, genuinely for the first time, real accessibility support.
Keyboard navigation on every tab control. Proper screen-reader labels on icon buttons that used to have none. A live-announcement region so background actions actually get spoken aloud. Full focus handling on every modal: it traps Tab, wraps at the edges, and hands focus back to whatever you clicked to open it.