⚡ Bolt: NodeInputs Edge Selection Optimization

[georgi]

⚡ Bolt: NodeInputs Edge Selection Optimization

💡 What

Refactored NodeInputs.tsx to use a custom memoized selector useConnectedEdgesSelector instead of subscribing directly to state.edges via useNodes and filtering inline.

🎯 Why

NodeInputs previously subscribed to the entire state.edges array. Because React Flow updates the node/edge state on every frame during drag operations (60fps), state.edges constantly changed reference.
This caused all node input components to fully re-render on any graph edge change, even if the new edge was completely unrelated to that node.
By using a dedicated selector that returns a stable array reference when connected edges are identical, we eliminate these O(N*E) re-renders during interactions.

📊 Impact

• Eliminates Unnecessary Computations: Prevents O(N*E) array iterations per graph update.
• Prevents Unnecessary Re-renders: Fixes NodeInputs so it only re-renders when its specific connection state changes, not on any graph edge change.
• Improved Responsiveness: Frees up main thread time for smoother graph interactions, particularly when dragging nodes with many dynamic inputs.

🔬 Measurement

Verified using a performance regression test.

• Before: Adding an unrelated edge caused NodeInputs wrapper to re-render.
• After: Adding an unrelated edge does NOT cause NodeInputs wrapper to re-render.

🧪 Testing

• Created web/src/hooks/nodes/__tests__/useConnectedEdges.test.ts to verify stable references.
• Created web/src/components/node/__tests__/NodeInputs.performance.test.tsx to verify NodeInputs render counts.
• Ran cd web && npm run typecheck: Passed.
• Ran cd web && npm run lint: Passed.
• Ran make test-web: All tests passed.

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PR created automatically by Jules for task 2389702828674086179 started by @georgi

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