Optimize dimension tool snapping to nearby components

[seveibar]

Motivation

• Limit snapping computation and marker rendering to components near the user cursor to reduce work and improve responsiveness of the dimensioning tool.

Description

• Add SNAP_SEARCH_RADIUS_PX and helper isPointNearBoundingBox to determine proximity between the cursor and an element's bounding box.
• Replace separate bounding-box and primitive-point passes with a single memoized elementSnapData map containing merged per-element bounds and per-primitive snap points.
• Convert SNAP_SEARCH_RADIUS_PX into world space using the current transform scale as searchRadiusInWorld and filter elements by proximity to cursorRwPoint before building snappingPoints.
• Track cursor world position with setCursorRwPoint during onMouseMove so snapping and rendered snap markers are localized to nearby elements.

Testing

• Ran bun test tests/lib and all tests passed (22 pass, 0 fail).
• Ran bunx tsc --noEmit and the TypeScript check succeeded.
• Ran bun run format and formatting completed successfully.

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Codex Task

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Project	Deployment	Actions	Updated (UTC)
pcb-viewer	Ready	Preview, Comment	Mar 26, 2026 3:00am