v6.2.1: Merge branch 'feature_map_edit_mode' into 'main'
feat(network-map): edit mode — create/move sites, segments, circuits
- Add edit mode toggle: place unpositioned sites, create sites/segments/
circuits, and move segment/circuit endpoints via inline map forms - Confirmation dialog before any endpoint replacement is persisted
- Viewport-fixed map layout with independently scrollable right panel
- Sites rendered in dedicated Leaflet pane (z-index 450) above connections
- Rollback DELETE on orphaned circuit when termination creation fails
- Fix highlight cleared immediately on object click (stopPropagation)
- Fix objects unclickable after edit mode exit (missing stopPropagation
in read-mode handler rewiring) - Update CHANGELOG [6.2.1] and README Network Map section