feat(editor): draggable move handle for wall-hosted doors & windows

Doors and windows could only be moved via the floating action menu — their
3D handle rig declared width/height resize arrows but no move grip, and
Ctrl/Meta-drag was a no-op for them. Add a press-drag move cross and make
direct-drag work for every bespoke-mover kind.

- door/window: add a `tap-action` `move-cross` handle (plane node-normal,
  portal grandparent, `engageMoveDrag`) mirroring the item wall grip. It
  routes through the existing per-kind move tool (3D `affordanceTools.move`,
  2D `floorplanMoveTarget`) — wall-bound slide + re-host onto another wall —
  so the grip, the floating Move button, and the 2D plan's move dot share one
  pipeline. Grab-drag-release commits without a second click.

- canDirectMoveNode: gate Ctrl/Meta-drag on `movable || affordanceTools.move`
  (the 3D-mountable move paths) instead of `movable` only, so doors/windows/
  walls/slabs/stairs/… are draggable in 3D as they already are in 2D.
  Floorplan-only movers (zone) stay excluded — no 3D tool mounts. The
  floating helper auto-syncs (it reads canDirectMoveNode).

- TapActionArrow: honor `plane: 'node-normal'` by tilting the move cross
  [π/2,0,0] into the wall face — previously ignored, so the item wall grip
  rendered flat too. Now door/window/wall-item crosses lie in the wall.

- use-node-events: split the drag-suppression gate. `inputDragging` still
  suppresses SELECTION events (the synthesized release-click would re-select),
  but no longer suppresses SPATIAL events (enter/move/leave) — a
  surface-following move tool runs with `inputDragging` set and needs
  wall:move to track the cursor. General consumers that must ignore drags
  (viewer hover, box-select) already self-gate on `inputDragging`; the
  editor's select-hover and paint-preview enter handlers now gate on it too.

- handle-arrow: make handle hit areas inert while `placementDragMode` is set,
  so a move grip riding the dragged node can't intercept the ray and starve
  the move tool's surface raycast.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

packages/nodes/src/window/definition.ts

@@ -18,6 +18,9 @@ const SIDE_HANDLE_OFFSET = 0.24
 const HEIGHT_HANDLE_OFFSET = 0.24
 const MIN_WINDOW_HEIGHT = 0.3
 const MIN_WINDOW_WIDTH = 0.3
+// How far the move cross floats off the wall face (+Z, the window's facing
+// normal) so it's grabbable instead of buried in the sash/frame.
+const MOVE_HANDLE_LIFT = 0.12
 
 function readWallLength(w: WindowNodeType, scene: { get: (id: AnyNodeId) => unknown }): number {
   if (!w.wallId) return Number.POSITIVE_INFINITY
@@ -113,7 +116,26 @@ function windowHeightHandle(edge: 'top' | 'bottom'): HandleDescriptor<WindowNode
   }
 }
 
+// Press-drag move grip at the window centre, standing in the wall face. Routes
+// through the same move tool as the floating Move button (3D
+// `affordanceTools.move`, 2D `floorplanMoveTarget`) — slide within the wall
+// plane + re-host onto another wall — committing on release, no second click.
+function windowMoveHandle(): HandleDescriptor<WindowNodeType> {
+  return {
+    kind: 'tap-action',
+    shape: 'move-cross',
+    plane: 'node-normal',
+    portal: 'grandparent',
+    cursor: 'move',
+    onActivate: (node, _scene, editor) => editor.engageMoveDrag(node),
+    placement: {
+      position: () => [0, 0, MOVE_HANDLE_LIFT],
+    },
+  }
+}
+
 const windowHandles: HandleDescriptor<WindowNodeType>[] = [
+  windowMoveHandle(),
   windowWidthHandle('left'),
   windowWidthHandle('right'),
   windowHeightHandle('top'),