feat: replace layer toggle with layer selector menu

- Replace ToggleMapLayerAction with SelectMapLayerAction that takes a specific layer
- Update fireMapReducer to handle SelectMapLayerAction instead of toggling
- Use PopupMenuButton with GlobalKey to open menu on button tap
- Show check icon and bold text for currently selected layer
- Menu items display layer names: OSMC Grey, OSMC, Esri Street, Esri Satellite, Esri Terrain
- Selecting a layer immediately updates Redux state and closes the menu

lib/layerSelectorMapPlugin.dart

@@ -4,7 +4,8 @@ import 'package:get_it/get_it.dart';
 import 'package:redux/redux.dart';
 
 import 'models/appState.dart';
-import 'redux/actions.dart';
+import 'models/fireMapState.dart';
+import 'redux/fireMapActions.dart';
 
 /// Layer selector widget for changing map layers
 class LayerSelectorMapPluginWidget extends StatelessWidget {
@@ -29,14 +30,62 @@ class LayerSelectorMapPluginWidget extends StatelessWidget {
   }
 
   Widget _LayerSelectorButton(Store<AppState> store) {
-    return new FloatingActionButton(
+    final key = GlobalKey<PopupMenuButtonState<FireMapLayer>>();
+
+    return PopupMenuButton<FireMapLayer>(
+      key: key,
+      initialValue: store.state.fireMapState.layer,
+      onSelected: (FireMapLayer layer) {
+        store.dispatch(SelectMapLayerAction(layer));
+      },
+      itemBuilder: (BuildContext context) {
+        return FireMapLayer.values.map((FireMapLayer layer) {
+          final isSelected = store.state.fireMapState.layer == layer;
+          return PopupMenuItem<FireMapLayer>(
+            value: layer,
+            child: Row(
+              children: [
+                Icon(
+                  isSelected ? Icons.check : Icons.check,
+                  color: isSelected ? Colors.blue : Colors.transparent,
+                  size: 20,
+                ),
+                SizedBox(width: 8),
+                Text(
+                  _getLayerName(layer),
+                  style: TextStyle(
+                    fontWeight:
+                        isSelected ? FontWeight.bold : FontWeight.normal,
+                  ),
+                ),
+              ],
+            ),
+          );
+        }).toList();
+      },
+      child: FloatingActionButton(
         backgroundColor: Colors.black26,
         mini: true,
-        child: Icon(
+        child: Icon(Icons.layers),
-          Icons.layers,
-        ),
         onPressed: () {
-          store.dispatch(new ToggleMapLayerAction());
+          key.currentState?.showButtonMenu();
-        });
+        },
+      ),
+    );
+  }
+
+  String _getLayerName(FireMapLayer layer) {
+    switch (layer) {
+      case FireMapLayer.osmcGrey:
+        return 'OSMC Grey';
+      case FireMapLayer.osmc:
+        return 'OSMC';
+      case FireMapLayer.esri:
+        return 'Esri Street';
+      case FireMapLayer.esriSatellite:
+        return 'Esri Satellite';
+      case FireMapLayer.esriTerrain:
+        return 'Esri Terrain';
+    }
   }
 }

lib/redux/fireMapActions.dart

@@ -1,5 +1,6 @@
 import 'package:fires_flutter/models/yourLocation.dart';
 import 'package:fires_flutter/models/fireNotification.dart';
+import 'package:fires_flutter/models/fireMapState.dart';
 
 abstract class FiresMapActions {}
 
@@ -53,4 +54,8 @@ class EditCancelYourLocationAction extends FiresMapActions {
   EditCancelYourLocationAction(this.loc);
 }
 
-class ToggleMapLayerAction extends FiresMapActions {}
+class SelectMapLayerAction extends FiresMapActions {
+  final FireMapLayer layer;
+
+  SelectMapLayerAction(this.layer);
+}

lib/redux/fireMapReducer.dart

@@ -21,7 +21,7 @@ final fireMapReducer = combineReducers<FireMapState>([
       _editConfirmYourLocationMap),
   new TypedReducer<FireMapState, EditCancelYourLocationAction>(
       _editCancelYourLocationMap),
-  new TypedReducer<FireMapState, ToggleMapLayerAction>(_toggleMapLayer),
+  new TypedReducer<FireMapState, SelectMapLayerAction>(_selectMapLayer),
   new TypedReducer<FireMapState, UpdateYourLocationMapAction>(
       _updateYourLocationMap)
 ]);
@@ -99,12 +99,6 @@ FireMapState _editCancelYourLocationMap(
 FireMapStatus restoreStatusAfterSave(loc) =>
     loc.subscribed ? FireMapStatus.unsubscribe : FireMapStatus.view;
 
-FireMapState _toggleMapLayer(FireMapState state, ToggleMapLayerAction action) {
+FireMapState _selectMapLayer(FireMapState state, SelectMapLayerAction action) {
-  FireMapLayer currentLayer = state.layer;
+  return state.copyWith(layer: action.layer);
-  List<FireMapLayer> list = FireMapLayer.values;
-  int currentPos = list.indexOf(currentLayer);
-  currentPos++;
-  FireMapLayer next =
-      list.elementAt(currentPos >= list.length ? 0 : currentPos);
-  return state.copyWith(layer: next);
 }