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/locationUtils.dart

@@ -1,6 +1,5 @@
 import 'dart:async';
 
-import 'package:fires_flutter/models/yourLocation.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 import 'package:geocoding/geocoding.dart' as geo;
@@ -8,42 +7,43 @@ import 'package:location/location.dart';
 import 'package:objectid/objectid.dart';
 
 import 'generated/i18n.dart';
+import 'models/yourLocation.dart';
 
 Future<YourLocation> getUserLocation(
     GlobalKey<ScaffoldState> scaffoldKey) async {
   // Platform messages may fail, so we use a try/catch PlatformException.
   try {
-    Location _location = new Location();
+    final Location location0 = Location();
 
-    LocationData location = await _location.getLocation();
+    final LocationData location = await location0.getLocation();
 
     // It seems that the lib fails with lat/lon values
-    var yl = new YourLocation(
+    final YourLocation yl = YourLocation(
         id: ObjectId(), lat: location.latitude!, lon: location.longitude!);
-    var address;
+    String address;
     try {
       address = await getReverseLocation(lat: yl.lat, lon: yl.lon);
-      yl.description = address as String;
+      yl.description = address;
     } catch (e) {
       try {
         address =
             await getReverseLocation(lat: yl.lat, lon: yl.lon, external: true);
-        yl.description = address as String;
+        yl.description = address;
       } catch (e) {
         print('We cannot reverse geolocate');
       }
     }
     return yl;
   } on PlatformException catch (e) {
-    final context = scaffoldKey.currentContext;
+    final BuildContext? context = scaffoldKey.currentContext;
     if (context != null) {
       if (e.code == 'PERMISSION_DENIED') {
-        ScaffoldMessenger.of(context).showSnackBar(new SnackBar(
-          content: new Text(S.of(context).notPermsUbication),
+        ScaffoldMessenger.of(context).showSnackBar(SnackBar(
+          content: Text(S.of(context).notPermsUbication),
         ));
       } else if (e.code == 'PERMISSION_DENIED_NEVER_ASK') {}
-      ScaffoldMessenger.of(context).showSnackBar(new SnackBar(
-        content: new Text(S.of(context).isYourUbicationEnabled),
+      ScaffoldMessenger.of(context).showSnackBar(SnackBar(
+        content: Text(S.of(context).isYourUbicationEnabled),
       ));
     }
     return YourLocation.noLocation;
@@ -53,19 +53,19 @@ Future<YourLocation> getUserLocation(
 Future<String> getReverseLocation(
     {required double lat, required double lon, bool external = false}) async {
   try {
-    List<geo.Placemark> placemarks =
+    final List<geo.Placemark> placemarks =
         await geo.placemarkFromCoordinates(lat, lon);
     if (placemarks.isNotEmpty) {
-      var first = placemarks.first;
-      String address =
+      final geo.Placemark first = placemarks.first;
+      final String address =
           '${first.street}, ${first.locality}, ${first.administrativeArea}, ${first.country}';
-      print("${first.name} : $address");
+      print('${first.name} : $address');
       return address;
     } else {
       return 'Unable to determine address';
     }
   } catch (e) {
-    print("Error in reverse geocoding: $e");
-    throw Exception("Failed to reverse geocode: $e");
+    print('Error in reverse geocoding: $e');
+    throw Exception('Failed to reverse geocode: $e');
   }
 }