editor: green/red placement box for shelf + tool sync for presets (#366)

* 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>

packages/nodes/src/roof/floorplan.ts

@@ -96,7 +96,10 @@ function buildSegPlan(roof: RoofNode, seg: RoofSegmentNode): SegPlan {
   const rot = -(roof.rotation + seg.rotation)
   const cos = Math.cos(rot)
   const sin = Math.sin(rot)
-  const tp = (lx: number, lz: number): Pt => [segCx + lx * cos - lz * sin, segCz + lx * sin + lz * cos]
+  const tp = (lx: number, lz: number): Pt => [
+    segCx + lx * cos - lz * sin,
+    segCz + lx * sin + lz * cos,
+  ]
   const hw = Math.max(seg.width, 0.01) / 2
   const hd = Math.max(seg.depth, 0.01) / 2
   const lw = getRoofSegmentPlanLinework(seg)
@@ -110,7 +113,10 @@ function buildSegPlan(roof: RoofNode, seg: RoofSegmentNode): SegPlan {
     hips: lw.hips.map(mapSeg),
     breaks: lw.breaks.map(mapSeg),
     slope: lw.slope
-      ? { tail: tp(lw.slope.tail[0], lw.slope.tail[1]), head: tp(lw.slope.head[0], lw.slope.head[1]) }
+      ? {
+          tail: tp(lw.slope.tail[0], lw.slope.tail[1]),
+          head: tp(lw.slope.head[0], lw.slope.head[1]),
+        }
       : null,
   }
 }
@@ -133,13 +139,8 @@ function buildSegPlan(roof: RoofNode, seg: RoofSegmentNode): SegPlan {
  * group is decorative (`pointerEvents: 'none'`) — clicks fall through to the
  * segment hit-targets.
  */
-export function buildRoofFloorplan(
-  node: RoofNode,
-  ctx: GeometryContext,
-): FloorplanGeometry | null {
-  const segments = ctx.children.filter(
-    (c): c is RoofSegmentNode => c.type === 'roof-segment',
-  )
+export function buildRoofFloorplan(node: RoofNode, ctx: GeometryContext): FloorplanGeometry | null {
+  const segments = ctx.children.filter((c): c is RoofSegmentNode => c.type === 'roof-segment')
   if (segments.length === 0) return null
 
   const plans = segments.map((s) => buildSegPlan(node, s))