text_content is not in the API serializer schema, so text node content
was dropped on save and the node came back empty after reload.
Store text in label instead — already persisted, and TextNode + the
edit modal already fall back to label, so existing data stays
compatible. Clear stale text_content on update.
Regression test added for the text-node save/load roundtrip.
- Drag waypoints to reshape edges; double-click a waypoint to remove it
- + handles at segment midpoints to insert new waypoints
- Bezier style: catmull-rom smooth curves through waypoints
- Smooth style: rounded-corner polyline with soft 45° snap (snaps within 15px)
- First + handle biased to source axis for perpendicular node exit
- snap45both: ray-intersection solver ensures both adjacent segments snap to 45° simultaneously
- Clear path button in EdgeModal when waypoints exist
- Waypoints serialised/deserialised with canvas state