Experiment/graph UI improvements

[vrupak]

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[vrupak]

Canvas Rendering Optimizations

Reduced per-frame overhead and improved rendering efficiency

• Spatial grid for hit detection
• Batched edge rendering by type (fewer canvas state changes)
• Canvas quality settings initialized once instead of every frame
• Optimized render key using fast hash instead of string concatenation
• Memoized nodeMap to avoid rebuilding every frame

Node Limiting & Memory Management

Smart memory limiting prevents performance issues with large datasets

• maxNodes prop limits total memory nodes (default: 500 in playground)
• Dynamic per-document cap distributes budget across documents
• Prioritizes recent memories and high-relevance scores
• k-NN similarity limit reduced from 15 to 10 connections per document