UX-09 fully implemented: depth-counter drag detection, Teleport overlay, FileManagerView.handleOsDrop wired through App.vue routeViewRef. 198/198 tests passing, 0 regressions.
UX-09 fully implemented: depth-counter drag detection, Teleport overlay, FileManagerView.handleOsDrop wired through App.vue routeViewRef. 198/198 tests passing, 0 regressions.