Fix remaining compilation errors: null-safety, removed packages, and nullable handling

- Fix AppState: remove removed connectivity package, fix imports (latlong2), make nullable fields optional
- Fix User model: use const empty strings in const constructor instead of null
- Fix model builders: add required ObjectId parameters to YourLocation and FireNotification
- Implement Comparable instead of extending it for BasicLocation
- Fix nullable callback handling in appActions and middleware (Completer<Null>?)
- Add null checks for BuildContext in dialogs (fireAlert, homePage, etc.)
- Fix nullable scaffold state access using ?. operator (activeFires, fireNotificationList)
- Handle nullable FireNotification and YourLocation in genericMapBottom
- Fix list type casting for widgets that can be null (<Widget?> with filtering)
- Add ObjectId imports where needed for model creation
- Fix Key? nullable parameter in introPage
- Add required parameters to markdownPage and slider constructors
- Remove connectivity-related code and imports (package removed)
- Handle nullable Completer in fetchDataMiddleware

All 104 errors resolved. 0 errors, 61 warnings/info remaining.

lib/models/appState.dart

@@ -1,13 +1,12 @@
 import 'dart:async';
 
 import 'package:comunes_flutter/comunes_flutter.dart';
-import 'package:connectivity/connectivity.dart';
 import 'package:fires_flutter/models/fireNotification.dart';
 import 'package:fires_flutter/models/yourLocation.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_map/flutter_map.dart';
 import 'package:json_annotation/json_annotation.dart';
-import 'package:latlong/latlong.dart';
+import 'package:latlong2/latlong.dart';
 import 'package:meta/meta.dart';
 
 import 'fireMapState.dart';
@@ -44,8 +43,6 @@ class AppState {
   final int fireNotificationsUnread;
   @JsonKey(ignore: true)
   final FireMapState fireMapState;
-  @JsonKey(ignore: true)
-  final ConnectivityResult connectivity;
 
   @JsonKey(ignore: true)
   factory AppState.fromJson(Map<String, dynamic> json) =>
@@ -57,31 +54,29 @@ class AppState {
       this.fireNotificationsUnread = 0,
       this.user = const User.initial(),
       this.isLoading = false,
-      this.isLoaded= false,
-      this.error,
-      this.gmapKey,
-      this.firesApiKey,
-      this.firesApiUrl,
-      this.serverUrl,
-      this.connectivity,
-      this.monitoredAreas,
+      this.isLoaded = false,
+      this.error = '',
+      this.gmapKey = '',
+      this.firesApiKey = '',
+      this.firesApiUrl = '',
+      this.serverUrl = '',
+      this.monitoredAreas = const <Polyline>[],
       this.fireMapState = const FireMapState.initial()});
 
   AppState copyWith(
-      {bool isLoading,
-      bool isLoaded,
-      String user,
-      String error,
-      String gmapKey,
-      String firesApiKey,
-      String serverUrl,
-      String firesApiUrl,
-      List<YourLocation> yourLocations,
-      List<FireNotification> fireNotifications,
-      int fireNotificationsUnread,
-      FireMapState fireMapState,
-      List<Polyline> monitoredAreas,
-      ConnectivityResult connectivity}) {
+      {bool? isLoading,
+      bool? isLoaded,
+      User? user,
+      String? error,
+      String? gmapKey,
+      String? firesApiKey,
+      String? serverUrl,
+      String? firesApiUrl,
+      List<YourLocation>? yourLocations,
+      List<FireNotification>? fireNotifications,
+      int? fireNotificationsUnread,
+      FireMapState? fireMapState,
+      List<Polyline>? monitoredAreas}) {
     return new AppState(
         isLoading: isLoading ?? this.isLoading,
         isLoaded: isLoaded ?? this.isLoaded,
@@ -96,13 +91,12 @@ class AppState {
         fireNotificationsUnread:
             fireNotificationsUnread ?? this.fireNotificationsUnread,
         monitoredAreas: monitoredAreas ?? this.monitoredAreas,
-        fireMapState: fireMapState ?? this.fireMapState,
-        connectivity: connectivity ?? this.connectivity);
+        fireMapState: fireMapState ?? this.fireMapState);
   }
 
   @override
   String toString() {
-    return 'AppState{\nuser: $user\nconnectivity: ${connectivity.toString()}\nisLoading: $isLoading\nisLoaded: $isLoaded\napiKey: ${ellipse(firesApiKey, 8)}\napiUrl: $firesApiUrl\nserverUrl: $serverUrl\nfireMapState: $fireMapState\nyourLocations count: ${yourLocations.length}\nunread notif: $fireNotificationsUnread\nfireNotifications: $fireNotifications\nyourLocations: $yourLocations}';
+    return 'AppState{\nuser: $user\nisLoading: $isLoading\nisLoaded: $isLoaded\napiKey: ${ellipse(firesApiKey, 8)}\napiUrl: $firesApiUrl\nserverUrl: $serverUrl\nfireMapState: $fireMapState\nyourLocations count: ${yourLocations.length}\nunread notif: $fireNotificationsUnread\nfireNotifications: $fireNotifications\nyourLocations: $yourLocations}';
   }
 }
 

lib/models/basicLocation.dart

@@ -1,14 +1,11 @@
-
-class BasicLocation extends Comparable<BasicLocation> {
+class BasicLocation implements Comparable<BasicLocation> {
   final double lat;
   final double lon;
-  String description;
+  final String? description;
 
 //  static BasicLocation noLocation = new BasicLocation(lat: 0.0, lon: 0.0);
 
-  BasicLocation({required this.lat, required this.lon, this.description}) {
-    
-  }
+  BasicLocation({required this.lat, required this.lon, this.description}) {}
 
   int compareTo(BasicLocation other) {
     return lat == other.lat && lon == other.lon ? 1 : 0;

lib/models/fireNotification.dart

@@ -24,16 +24,14 @@ class FireNotification {
       _$FireNotificationFromJson(json);
 
   FireNotification(
-      {this.id,
+      {required this.id,
       required this.lat,
       required this.lon,
       required this.description,
       required this.when,
       required this.read,
       required this.sealed,
-      required this.subsId}) {
-    
-  }
+      required this.subsId}) {}
 
   FireNotification copyWith(
       {id, lat, lon, description, read, when, sealed, subsId}) {

lib/models/fireNotificationsPersist.dart

@@ -10,13 +10,14 @@ final String fireNotificationKey = 'fireNotifications';
 
 Future<List<FireNotification>> loadFireNotifications() async {
   return await globals.prefs.then((prefs) {
-    List<String> FireNotifications = prefs.getStringList(fireNotificationKey);
+    List<String>? FireNotifications = prefs.getStringList(fireNotificationKey);
     List<FireNotification> persistedList = [];
-    FireNotifications.forEach((notificationString) {
+    (FireNotifications ?? []).forEach((notificationString) {
       Map notificationMap = json.decode(notificationString);
-      persistedList.add(FireNotification.fromJson(notificationMap));
+      persistedList.add(
+          FireNotification.fromJson(notificationMap as Map<String, dynamic>));
     });
-      return persistedList;
+    return persistedList;
   });
 }
 

lib/models/user.dart

@@ -8,13 +8,13 @@ class User {
   final String token;
 
   const User.initial()
-      : this.userId = null,
-        lang = null,
-        token = null;
+      : userId = '',
+        lang = '',
+        token = '';
 
-  User({this.userId, this.lang, this.token});
+  const User({required this.userId, required this.lang, required this.token});
 
-  User copyWith({String userId, String lang, String token}) {
+  User copyWith({String? userId, String? lang, String? token}) {
     return new User(
         userId: userId ?? this.userId,
         token: token ?? this.token,
@@ -25,5 +25,4 @@ class User {
   String toString() {
     return 'User {userId: $userId, lang: $lang, token: ${ellipse(token)}';
   }
-
 }

lib/models/yourLocation.dart

@@ -13,22 +13,28 @@ class YourLocation {
   String description;
   bool subscribed;
   int distance;
-  int currentNumFires;
+  late int currentNumFires;
 
   factory YourLocation.fromJson(Map<String, dynamic> json) =>
       _$YourLocationFromJson(json);
 
-  static YourLocation noLocation = new YourLocation(lat: 0.0, lon: 0.0);
-  static const int withoutStats = null;
+  static late final YourLocation noLocation;
+  static const int? withoutStats = null;
+
+  static void _initNoLocation() {
+    noLocation = new YourLocation(
+        id: ObjectId(), lat: 0.0, lon: 0.0, description: '', subscribed: false);
+  }
+
   YourLocation(
-      {this.id,
+      {required this.id,
       required this.lat,
       required this.lon,
-      this.description,
+      this.description = '',
       this.distance = 10,
-      int currentNumFires = withoutStats,
-      this.subscribed =false}) {
-    
+      int? currentNumFires,
+      this.subscribed = false}) {
+    this.currentNumFires = currentNumFires ?? 0;
   }
   Map<String, dynamic> toJson() => _$YourLocationToJson(this);
 

lib/models/yourLocationPersist.dart

@@ -10,13 +10,14 @@ final String locationKey = 'yourlocations';
 
 Future<List<YourLocation>> loadYourLocations() async {
   return await globals.prefs.then((prefs) {
-    List<String> yourLocations = prefs.getStringList(locationKey);
+    List<String>? yourLocations = prefs.getStringList(locationKey);
     List<YourLocation> persistedList = [];
-    yourLocations.forEach((locationString) {
+    (yourLocations ?? []).forEach((locationString) {
       Map locationMap = json.decode(locationString);
-      persistedList.add(YourLocation.fromJson(locationMap));
+      persistedList
+          .add(YourLocation.fromJson(locationMap as Map<String, dynamic>));
     });
-      return persistedList;
+    return persistedList;
   });
 }