pin/fix graph point as static anchor points #177
Description
It would be highly beneficial to have a functionality to pin or fix individual graph vertices. A pinned vertex would maintain its fixed position in space.
During interactive graph manipulation (like dragging other nodes), the force-directed layout algorithm would then treat these pinned vertices as immutable anchor points. This would allow the rest of the graph to reorient and settle around these fixed points, providing much greater control over the final layout.