feat: show recent position trail for selected vehicle#99
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Append each vehicle's current position to an in-memory history list
during cache refresh (max 60 entries per vehicle). Expose the history
via a new GET /api/vehicles/{vehicle_id}/history endpoint.
Closes #92
Add useVehicleHistory hook that fetches position history for the selected vehicle. Render a dashed polyline trail behind the selected vehicle using its route color with reduced opacity.
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Backend: tracks the last 60 positions per vehicle in
_vehicle_historyand exposes them viaGET /api/vehicles/{vehicle_id}/history.Frontend: new
useVehicleHistoryhook and a dashed polyline at 0.4 opacity behind the selected vehicle marker on the map, using the vehicle's route colour.Closes #92