ConnectionStrategyPin
type ConnectionStrategyPin = "none" | "absolute" | "relative";
How a dropped link end is anchored to its target:
'none'— keep the JointJS defaults (attach to the cell/port, no fixed anchor).'absolute'— pin the end at a fixed pixel offset within the target.'relative'— pin the end at an offset given as a percentage of the target's size, so it tracks resizing.