feat: add sensor move mode to floor plan

lib/features/floorplan/floor_plan_screen.dart

@@ -32,7 +32,26 @@ class _FloorPlanScreenState extends ConsumerState<FloorPlanScreen> {
         .then((rooms) => _editorKey.currentState?.loadFloorPlan(rooms));
     ref
         .read(sensorsProvider.future)
-        .then((sensors) => _editorKey.currentState?.loadSensors(sensors));
+        .then((sensors) {
+          _editorKey.currentState?.loadSensors(sensors);
+          _applyPlacementState();
+        });
+  }
+
+  void _applyPlacementState() {
+    final placing = ref.read(sensorPlacementProvider);
+    if (placing == null) {
+      _editorKey.currentState?.highlightSensor(null);
+      return;
+    }
+    final currentMode = ref.read(floorPlanModeProvider);
+    if (currentMode != FloorPlanMode.view) {
+      ref.read(floorPlanModeProvider.notifier).state = FloorPlanMode.view;
+      _editorKey.currentState?.setMode(FloorPlanMode.view);
+    }
+    if (placing.isPlaced) {
+      _editorKey.currentState?.highlightSensor(placing.id.toString());
+    }
   }
 
   Future<void> _confirmPlacement(Sensor sensor) async {
@@ -81,9 +100,7 @@ class _FloorPlanScreenState extends ConsumerState<FloorPlanScreen> {
     ref.listen(particleCloudProvider, (_, next) {
       next.whenData((p) => _editorKey.currentState?.updateParticleCloud(p));
     });
-    ref.listen(selectedSensorIdProvider, (_, id) {
-      _editorKey.currentState?.highlightSensor(id);
-    });
+    ref.listen(sensorPlacementProvider, (prev, next) => _applyPlacementState());
 
     final unplaced = sensorsAsync.valueOrNull
             ?.where((s) => !s.isPlaced)
@@ -103,23 +120,37 @@ class _FloorPlanScreenState extends ConsumerState<FloorPlanScreen> {
         appBar: AppBar(
           title: const Text('Floor Plan'),
           actions: [
-            if (placingSensor == null)
-              IconButton(
-                tooltip:
-                    mode == FloorPlanMode.edit ? 'View mode' : 'Edit mode',
-                icon: Icon(
-                  mode == FloorPlanMode.edit
-                      ? Icons.visibility
-                      : Icons.edit,
+            if (placingSensor == null) ...[
+              if (mode == FloorPlanMode.view) ...[
+                IconButton(
+                  tooltip: 'Edit mode',
+                  icon: const Icon(Icons.edit),
+                  onPressed: () {
+                    ref.read(floorPlanModeProvider.notifier).state =
+                        FloorPlanMode.edit;
+                    _editorKey.currentState?.setMode(FloorPlanMode.edit);
+                  },
                 ),
-                onPressed: () {
-                  final next = mode == FloorPlanMode.edit
-                      ? FloorPlanMode.view
-                      : FloorPlanMode.edit;
-                  ref.read(floorPlanModeProvider.notifier).state = next;
-                  _editorKey.currentState?.setMode(next);
-                },
-              ),
+                IconButton(
+                  tooltip: 'Sensor move mode',
+                  icon: const Icon(Icons.sensors),
+                  onPressed: () {
+                    ref.read(floorPlanModeProvider.notifier).state =
+                        FloorPlanMode.sensorMove;
+                    _editorKey.currentState?.setMode(FloorPlanMode.sensorMove);
+                  },
+                ),
+              ] else
+                IconButton(
+                  tooltip: 'Done',
+                  icon: const Icon(Icons.check),
+                  onPressed: () {
+                    ref.read(floorPlanModeProvider.notifier).state =
+                        FloorPlanMode.view;
+                    _editorKey.currentState?.setMode(FloorPlanMode.view);
+                  },
+                ),
+            ],
           ],
         ),
         body: Column(
@@ -131,8 +162,6 @@ class _FloorPlanScreenState extends ConsumerState<FloorPlanScreen> {
                     key: _editorKey,
                     mode: mode,
                     onSensorTapped: (id) {
-                      ref.read(selectedSensorIdProvider.notifier).state =
-                          id;
                       showSensorDetailSheet(context, int.parse(id));
                     },
                     onSensorMoved: (sensorId, roomId, x, y) async {
@@ -163,8 +192,6 @@ class _FloorPlanScreenState extends ConsumerState<FloorPlanScreen> {
                     },
                     onRoomAdded: (x, y) => _showAddRoomDialog(x, y),
                     onEditRoomTapped: _showRoomEditSheet,
-                    onEditSensorTapped: (id) =>
-                        showSensorDetailSheet(context, int.parse(id)),
                     onAddSensorTapped: () => showModalBottomSheet<void>(
                       context: context,
                       isScrollControlled: true,