The popup sat on top of the plane and hid the trail it had just drawn. Details now render in a panel docked top-right (portaled into the Leaflet container, click/scroll propagation disabled), so the map can be panned to follow the path. Clicking empty map or the same plane deselects; hover tooltip unchanged. Verified: tsc --noEmit clean (node:20 on radio-box). Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>