Two changes from the split-view / wall-endpoint perf + UX pass.
floorplan-panel: render the heavy 2D <svg> scene only when the panel is visible
(`isFloorplanOpen`, i.e. viewMode !== '3d'). The panel stays mounted in 3D
(display:none) to keep the portalled compass + viewport state warm, but the
registry layer / per-node InteractiveGeometry / handle layers no longer
reconcile on every scene change while invisible. Renders fully in 2D and split;
viewport pan/zoom is preserved across the toggle.
wall move-endpoint-tool: preview via `useLiveNodeOverrides` instead of writing
`useScene.updateNodes` every grid:move tick. The per-tick store write handed a
fresh `nodes` ref to every `useScene(s => s.nodes)` subscriber (WallPanel, the
contextual HUD, tooltips, floor plan), rebuilding them all each frame. Overrides
are merged by the wall system, wall panel, and 2D floor plan, so the preview
still tracks live with no store churn; the store is written once on commit, and
one Ctrl-Z reverts to the original endpoint. Also swallow the click that follows
every endpoint-tool release so it can't fall through to the wall body and arm
the wall move tool (no-drag tap or post-commit).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
