editor: fix preset double-commit ghosts, show compass in all view modes (#393)

* fix: guard preset placement against double commit from duplicate click events

A single physical click reaches commitAtCursor twice: node clicks are
synthesized on pointerup (use-node-events) while grid:click rides the
native click event from a canvas DOM listener (use-grid-events) that
deliberately ignores stopPropagation. The second pass found the fresh
draft already deleted and took the orphan re-create path, minting a
hidden ghost copy, replaying the placement SFX, and abandoning the
re-armed clone as a second ghost.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* feat: show the compass in all view modes via the viewer-area container

The floorplan compass now portals onto the always-visible viewer area
instead of living inside the (display:none in 3D) floorplan pane. The
2D/3D navigation poses already sync through navigationSyncPose, so the
needle and align-to-north stay correct in 2d, 3d, and split alike.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

---------

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

packages/editor/src/components/editor/floorplan-panel.tsx

@@ -4519,7 +4519,17 @@ const FloorplanPolygonHandleLayer = memo(function FloorplanPolygonHandleLayer({
   )
 })
 
-export function FloorplanPanel() {
+export function FloorplanPanel({
+  /**
+   * Element to portal the compass button into. The 2D/3D navigation poses stay
+   * in sync (`navigationSyncPose`), so hosting the compass on the always-visible
+   * viewer-area container keeps it correct — needle and align-to-north alike —
+   * in 2d, 3d, and split modes, while this panel itself may be display:none.
+   */
+  compassHost,
+}: {
+  compassHost?: HTMLElement | null
+}) {
   const viewportHostRef = useRef<HTMLDivElement>(null)
   const svgRef = useRef<SVGSVGElement>(null)
   const floorplanSceneRef = useRef<SVGGElement>(null)
@@ -10135,12 +10145,21 @@ export function FloorplanPanel() {
             only action menu the floor plan mounts. */}
         <FloorplanRegistryActionMenu />
 
-        {(levelNode?.type === 'level' || hasAmbientBuildingLevel) && (
+        {(levelNode?.type === 'level' || hasAmbientBuildingLevel) &&
+          (compassHost ? (
+            createPortal(
+              <FloorplanCompassButton
+                northRotationDeg={-floorplanUserRotationDeg}
+                onAlignNorth={alignFloorplanViewToNorth}
+              />,
+              compassHost,
+            )
+          ) : (
             <FloorplanCompassButton
               northRotationDeg={-floorplanUserRotationDeg}
               onAlignNorth={alignFloorplanViewToNorth}
             />
-        )}
+          ))}
 
         {referenceScaleDraft && (
           <div className="pointer-events-none absolute top-3 left-1/2 z-30 -translate-x-1/2 rounded-md border bg-background/95 px-3 py-2 text-center text-sm shadow-sm">

packages/editor/src/components/editor/index.tsx

@@ -816,6 +816,13 @@ const ViewerCanvas = memo(function ViewerCanvas({
   )
 
   const viewerAreaRef = useRef<HTMLDivElement>(null)
+  // State mirror of `viewerAreaRef` so the floorplan compass portal re-renders
+  // once the container exists (a plain ref mutation wouldn't trigger it).
+  const [viewerAreaEl, setViewerAreaEl] = useState<HTMLDivElement | null>(null)
+  const setViewerAreaNode = useCallback((el: HTMLDivElement | null) => {
+    viewerAreaRef.current = el
+    setViewerAreaEl(el)
+  }, [])
   const viewer3dRef = useRef<HTMLDivElement>(null)
   const isResizingFloorplan = useRef(false)
 
@@ -861,7 +868,9 @@ const ViewerCanvas = memo(function ViewerCanvas({
 
   return (
     <ErrorBoundary fallback={<EditorSceneCrashFallback />}>
-      <div className="flex h-full" ref={viewerAreaRef}>
+      {/* `relative` so the floorplan compass (portaled here to stay visible in
+          2d / 3d / split alike) can anchor to this container's bottom-left. */}
+      <div className="relative flex h-full" ref={setViewerAreaNode}>
         {/* 2D floorplan — always mounted once shown, hidden via CSS to preserve state */}
         <div
           className="relative h-full flex-shrink-0"
@@ -871,7 +880,7 @@ const ViewerCanvas = memo(function ViewerCanvas({
           }}
         >
           <div className="h-full w-full overflow-hidden">
-            <FloorplanPanel />
+            <FloorplanPanel compassHost={viewerAreaEl} />
           </div>
           {viewMode === 'split' && (
             <div

packages/editor/src/components/tools/registry/move-registry-node-tool.tsx

@@ -360,6 +360,15 @@ export function MoveRegistryNodeTool({ node }: { node: AnyNode }) {
      *  AND scene updated) — never the original.
      */
     const commitAtCursor = (event: ClickTriggerEvent) => {
+      // One physical click can reach here twice: node clicks (`slab:click`,
+      // `item:click`, …) are synthesized on *pointerup* (`use-node-events`),
+      // while `grid:click` rides the browser's native *click* event from a
+      // canvas DOM listener (`use-grid-events`) that deliberately ignores
+      // stopPropagation — and this effect stays subscribed until React
+      // re-renders after `exitMoveMode`. Without this guard the second pass
+      // finds the fresh draft already deleted and takes the orphan re-create
+      // path below, minting a hidden ghost copy and replaying the SFX.
+      if (committed) return
       // Ignore a commit that fires before the cursor has moved into place —
       // it's the stray trailing click of whatever armed this move, not a
       // deliberate drop. Prevents preset re-arm from double-placing.