perf: memoize canvas hot-path selection and connector lookups

[charlesrhoward]

Summary

• memoize selected-element derivation used by PropertiesPanel and ActionsMenu
• build an element lookup map for render-time connector anchor lookup
• replace repeated elements.find(...) IIFE work with memoized connector anchor values

Validation

• pnpm build

Closes #27

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Note

Low Risk
Pure client-side performance refactor that preserves behavior but changes render-time derivation paths for selection and connector preview anchors.

Overview
Improves canvas render performance by memoizing selected-element derivation used by PropertiesPanel and ActionsMenu, avoiding repeated filter/includes work on each render.

Also replaces per-render elements.find(...) IIFEs for connector preview anchors with a memoized elementById map and computed connectorPreviewAnchor, reducing connector drag hot-path lookups.

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Project	Deployment	Actions	Updated (UTC)
drawit	Ready	Preview, Comment	Feb 21, 2026 9:44pm