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* feat(editor): shelf placement validity box + sync tool for positioned presets Give the generic move tool a green/red footprint box for shelf placement, matching the GLB item cursor, and drop the vertical-arrow CursorSphere for shelves. Box colour comes from canPlaceOnFloor; an invalid (red) drop is refused unless Shift forces it, and R/T play the rotate sfx. Re-sync the box transform on node change so a re-armed clone isn't left at the previous rotation/position. Extract the box wireframe geometry helpers into a shared placement-box-geometry module reused by the item coordinator and the new declarative PlacementBox component. Export the Tool type so host apps can set the active tool for a positioned preset. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> * chore: apply biome formatting + ignore generated next-env.d.ts Format files that predate the current biome config (lineWidth 100, single quotes, semicolons as-needed) so they stop showing as dirty on every checkout. Formatting only — no behavior change. Also exclude **/next-env.d.ts from biome: Next regenerates it (double quotes + semicolon) on every build, so biome kept reformatting it into a perpetual dirty diff. Ignoring it lets Next own the file. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> --------- Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>