fix(nav): preserve POI checkbox order

app/backend/node_manager.py

@@ -914,7 +914,14 @@ def cmd_send_pois(self, poi_ids: list[int]):
                 return
             with open(pois_file) as f:
                 all_pois = json.load(f)
-            payload = {str(pid): all_pois[str(pid)] for pid in poi_ids if str(pid) in all_pois}
+            # Re-index as a dense queue ("0", "1", ...) so downstream
+            # consumers navigate in the same order the UI sent the checked POIs,
+            # instead of falling back to the original ids / pois.json order.
+            payload = {}
+            for pid in poi_ids:
+                key = str(pid)
+                if key in all_pois:
+                    payload[str(len(payload))] = all_pois[key]
             self._cmd_pois_pub.publish(String(data=json.dumps(payload)))
         with self._lock:
             nav_running = self._nav_nodes_running

app/frontend/lib/pages/operate_tab.dart

@@ -628,7 +628,8 @@ class _PoiSheet extends ConsumerStatefulWidget {
 }
 
 class _PoiSheetState extends ConsumerState<_PoiSheet> {
-  final Set<int> _checkedIds = {};
+  /// POI ids in the exact order they were checked.
+  final List<int> _checkedIds = [];
 
   Future<void> _deletePoi(Poi poi) async {
     final ok = await showDialog<bool>(
@@ -662,7 +663,8 @@ class _PoiSheetState extends ConsumerState<_PoiSheet> {
   }
 
   Future<void> _startNav(List<Poi> pois) async {
-    final selectedPois = pois.where((p) => _checkedIds.contains(p.id)).toList();
+    final poiById = {for (final poi in pois) poi.id: poi};
+    final selectedPois = _checkedIds.map((id) => poiById[id]).whereType<Poi>().toList();
     if (selectedPois.isEmpty) return;
     try {
       await ref.read(dioProvider).post(
@@ -734,15 +736,24 @@ class _PoiSheetState extends ConsumerState<_PoiSheet> {
                   )
                 : Column(
                     children: pois
-                        .map((poi) => _PoiTile(
-                              poi: poi,
-                              checked: _checkedIds.contains(poi.id),
-                              onChecked: (v) => setState(() {
-                                if (v) _checkedIds.add(poi.id);
-                                else _checkedIds.remove(poi.id);
-                              }),
-                              onDelete: () => _deletePoi(poi),
-                            ))
+                        .map((poi) {
+                          final orderIndex = _checkedIds.indexOf(poi.id);
+                          return _PoiTile(
+                            poi: poi,
+                            checked: orderIndex != -1,
+                            orderNumber: orderIndex == -1 ? null : orderIndex + 1,
+                            onChecked: (v) => setState(() {
+                              if (v) {
+                                if (!_checkedIds.contains(poi.id)) {
+                                  _checkedIds.add(poi.id);
+                                }
+                              } else {
+                                _checkedIds.remove(poi.id);
+                              }
+                            }),
+                            onDelete: () => _deletePoi(poi),
+                          );
+                        })
                         .toList(),
                   ),
             loading: () => const Center(child: CircularProgressIndicator()),
@@ -757,12 +768,14 @@ class _PoiSheetState extends ConsumerState<_PoiSheet> {
 class _PoiTile extends StatelessWidget {
   final Poi poi;
   final bool checked;
+  final int? orderNumber;
   final ValueChanged<bool> onChecked;
   final VoidCallback onDelete;
 
   const _PoiTile({
     required this.poi,
     required this.checked,
+    required this.orderNumber,
     required this.onChecked,
     required this.onDelete,
   });
@@ -774,7 +787,7 @@ class _PoiTile extends StatelessWidget {
         value: checked,
         onChanged: (v) => onChecked(v ?? false),
       ),
-      title: Text(poi.name),
+      title: Text(orderNumber == null ? poi.name : '${poi.name} #$orderNumber'),
       subtitle: Text(
         '(${poi.x.toStringAsFixed(2)}, ${poi.y.toStringAsFixed(2)})',
         style: const TextStyle(fontSize: 12),