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Closes #616 ## What Adds a **Distance** column to the neighbor table on the node detail page. When both the viewed node and a neighbor have GPS coordinates recorded, the table shows the haversine distance between them (e.g. `3.2 km`). When either node lacks GPS, the cell shows `—`. ## Changes **Backend** (`cmd/server/neighbor_api.go`): - Added `distance_km *float64` (omitempty) to `NeighborEntry` - In `handleNodeNeighbors`: look up source node coords from `nodeMap`, then for each resolved (non-ambiguous) neighbor with GPS, compute `haversineKm` and set the field **Frontend** (`public/nodes.js`): - Added `Distance` column header between Last Seen and Conf - Cell renders `X.X km` or `—` (muted) when unavailable **Tests** (`cmd/server/neighbor_api_test.go`): - `TestNeighborAPI_DistanceKm_WithGPS`: two nodes with real coords → `distance_km` is positive - `TestNeighborAPI_DistanceKm_NoGPS`: two nodes at 0,0 → `distance_km` is nil ## Verification Test at **https://staging.on8ar.eu** — navigate to any node detail page and scroll to the Neighbors section. Nodes with GPS coordinates show a distance; those without show `—`.