Two fixes for the split-view FPS cliff when moving a wall or opening:
- wall/move-tool: publish the live preview to useLiveNodeOverrides instead of
writing useScene.updateNodes every frame. The store's `nodes` ref no longer
churns per frame (which had re-rendered every useScene(s => s.nodes) subscriber
app-wide). Matches the existing 2D wall drag + 3D wall-system override pattern;
the final plan still commits atomically as one undoable change.
- floorplan-registry-layer: replace the single global siblingEpoch with a
per-node epoch bumped only for the nodes affected by the live drag (dragged
wall -> walls at its old + new junctions + child openings; door/window -> host
wall; gutter -> roof-peer gutters), unioned with the previous frame's live set
so a cancelled drag reverts. Dragging one wall/opening now rebuilds a handful
of geometries instead of all the level's walls + openings.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
