nodes: restore floorPlaced imports stripped by the formatter

The previous commit's `floorPlaced` capability used `getScaledDimensions`
in `item/definition.ts` and `ColumnNodeType` in `column/definition.ts`,
but the editor's auto-format hook ran between the import edit and the
body edit and removed both as "unused" — breaking `bun dev`.

Re-add the imports.

packages/nodes/src/item/definition.ts

@@ -1,4 +1,8 @@
-import type { ItemNode as ItemNodeType, NodeDefinition } from '@pascal-app/core'
+import {
+  getScaledDimensions,
+  type ItemNode as ItemNodeType,
+  type NodeDefinition,
+} from '@pascal-app/core'
 import { buildItemFloorplan } from './floorplan'
 import { itemFloorplanMoveTarget } from './floorplan-move'
 import { itemParametrics } from './parametrics'