- Add CutStore (Zustand) to store cut node IDs, node data, edges, and source graph ID
- Update graphToDot() to render cut nodes with dashed grey style for visual indication
- Add 'Cut' action to node context menu; 'Paste' action to empty-area context menu
- Cut logic: captures selected nodes (or right-clicked node if none selected) plus
all nodes reachable by outgoing edges from those nodes; clears selection afterwards
- Paste logic: adds cut nodes/edges to target graph, removes them from source graph
in GraphsStore; pasting on the same graph as the cut source cancels the cut
- Graph re-renders automatically when cutNodeIds changes via useCutStore subscription
- Clear cut store on file load for consistency
- Add E2E tests covering: Cut menu visibility, Paste menu visibility, cut styling,
linked-node inclusion, cross-subgraph paste, source-graph cleanup, same-graph cancel
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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