refactor: move floor plan editor into own widget

lib/features/onboarding/steps/step_floor_plan.dart

@@ -3,7 +3,7 @@ import 'package:flutter_riverpod/flutter_riverpod.dart';
 
 import '../../../domain/models/floor_plan_mode.dart';
 import '../../../providers.dart';
-import '../../floorplan/widgets/konva_web_view.dart';
+import '../../floorplan/widgets/floor_plan_editor.dart';
 
 class StepFloorPlan extends ConsumerStatefulWidget {
   const StepFloorPlan({super.key, required this.onComplete});
@@ -15,7 +15,7 @@ class StepFloorPlan extends ConsumerStatefulWidget {
 }
 
 class _StepFloorPlanState extends ConsumerState<StepFloorPlan> {
-  final _konvaKey = GlobalKey<KonvaWebViewState>();
+  final _konvaKey = GlobalKey<FloorPlanEditorState>();
 
   @override
   void initState() {
@@ -42,11 +42,11 @@ class _StepFloorPlanState extends ConsumerState<StepFloorPlan> {
               style: Theme.of(context).textTheme.titleLarge),
         ),
         Expanded(
-          child: KonvaWebView(
+          child: FloorPlanEditor(
             key: _konvaKey,
             mode: FloorPlanMode.edit,
             onSensorTapped: (_) {},
-            onSensorMoved: (_, __, ___, ____) {},
+            onSensorMoved: (_, _, _, _) {},
             onRoomsUpdated: (roomUpdates) async {
               final floor = ref.read(floorProvider).valueOrNull;
               if (floor == null) return;