Add a 32px invisible strip on the left edge of the viewport that
auto-opens the sidebar when the user drags a card and dwells near the
edge for >=400ms. Removes the manual toggle step when moving cards to
sidebar-located columns.
- App.tsx: global mousemove listener while drag is active; 400ms hover
timer; sets navOpen(true) when triggered; cancels on pointer leave or
drag end. No auto-close on drag end (user keeps sidebar open).
- dropzone.css: subtle inset blue glow with pulse animation while
pointer is inside the strip and a drag is active.
- KanbanColumn.tsx: add data-column-id and data-column-location to the
Paper root for stable e2e selectors.
- e2e/sidebar-dropzone.spec.ts: Playwright test driving a slow drag
to the left edge, asserting the strip arms, sidebar opens, and the
card moves to a sidebar column via /api/board.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
