Backend:
- Guard create_diagram with 422 if current_user.team_id is None (prevents
NOT NULL constraint crash for accounts not yet assigned to a team)
- Add routing field to DiagramEdge schema (straight/curved/step)
Frontend:
- ConnectionEdge now supports straight (default), curved (bezier), and
step (smooth-step) routing per-edge via routing field in edge data
- PropertiesPanel Connection section gets a Line Style toggle:
Straight | Curved | Step buttons, active state highlights in accent
- handleEdgeUpdate and serializeEdges now propagate the routing field
- DiagramEdge type gets optional routing field
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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