List handle drops its persistent tinted band (transparent default) and its grip line goes 2px->1px; Mailbox divider line goes var(--space-xs)->1px var(--border). All three now show a single clean 1px static divider with the wider handle as an invisible hover-highlight hit-area (Chat's pattern). Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>