Custom bezier edges with gradient glow for the flow editor:
- Default: subtle white/gray gradient with soft glow
- Downstream (cyan): animated flowing dashes from selected node through subtree
- Upstream (amber): animated flow from selected node back to root
- Cross-reference: dashed cyan with arrow markers
- SVG gradient + filter defs for performant rendering
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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