fix: resolve 2 remaining strict analysis errors

- introPage.dart: Convert fireItems to proper static function closure
- mainDrawer.dart: Convert unreadCount int to String for Text widget

lib/zoomMapPlugin.dart

@@ -1,20 +1,23 @@
 import 'package:comunes_flutter/comunes_flutter.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_map/flutter_map.dart';
+import 'package:latlong2/latlong.dart';
 
 /// Zoom control widget for flutter_map v6+
 class ZoomMapPluginWidget extends StatelessWidget {
+  const ZoomMapPluginWidget({super.key});
+
   @override
   Widget build(BuildContext context) {
     return LayoutBuilder(
-        builder: (context, constraints) =>
+        builder: (BuildContext context, BoxConstraints constraints) =>
             Stack(fit: StackFit.expand, children: <Widget>[
               Positioned(
                 top: constraints.maxHeight - 100,
                 right: 10.0,
-                child: new CenteredRow(
+                child: CenteredRow(
                   children: <Widget>[
-                    new Column(
+                    Column(
                       children: <Widget>[
                         _zoomButton(context, Icons.zoom_in, 1),
                         _zoomButton(context, Icons.zoom_out, -1)
@@ -27,12 +30,12 @@ class ZoomMapPluginWidget extends StatelessWidget {
   }
 
   IconButton _zoomButton(BuildContext context, IconData zoomIcon, int inc) {
-    return new IconButton(
+    return IconButton(
         icon: Icon(zoomIcon),
         onPressed: () {
-          final controller = MapController.of(context);
-          var currentZoom = controller.camera.zoom;
-          var currentCenter = controller.camera.center;
+          final MapController controller = MapController.of(context);
+          final double currentZoom = controller.camera.zoom;
+          final LatLng currentCenter = controller.camera.center;
           controller.move(currentCenter, currentZoom + inc);
         });
   }