perf: reduce tooltip hover over-rendering in 3d viewer

[gavin-openops]

This PR reduces hover-triggered over-rendering that causes lag while moving across dense 3D scenes.

What changed

• Added throttling for onHover updates when the hovered object stays the same.
• Dispatches hover position updates only when:
  • pointer intersection moves meaningfully (distance threshold), and
  • enough time has passed since the last dispatch (~30fps cap).
• Preserved immediate object-enter/object-leave behavior (unhover still fires instantly).

Why

Issue #94 reports major slowdown while hovering tooltips. The previous behavior pushed state updates on every mousemove + raycast tick for the same object, which can trigger excessive React rerenders.

Validation

• bun run format:check src/react-three/HoverContext.tsx
• bun run build
• bun run test:node-bundle

/claim #94

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Project	Deployment	Actions	Updated (UTC)
3d-viewer	Ready	Preview, Comment	Mar 1, 2026 9:44pm