Migrate fires_flutter to flutter_map v6.1.0 and complete major null-safety fixes

- Updated Android build files: gradle plugin 8.2.2, gradle 8.3, SDK 34, minSdk 21
- Ran dart fix --apply for 87 automatic null-safety fixes
- Migrated flutter_map v6 API breaking changes:
  - MapOptions: center → initialCenter, zoom → initialZoom
  - layers → children structure
  - TileLayerOptions/MarkerLayerOptions/PolylineLayerOptions → TileLayer/MarkerLayer/PolylineLayer
  - Removed plugin_api.dart imports
  - Converted old plugin system (ZoomMapPlugin, AttributionPlugin, etc.) to direct widgets
  - Updated onTap callback signature: (TapPosition) → (TapPosition, LatLng)
- Migrated all marker/polyline creation to v6 API
- Fixed FlatButton → TextButton deprecation
- Fixed stackTrace access with catch(e, stackTrace) pattern
- Removed deprecated flutter_google_places_autocomplete dependency
- Removed deprecated dependencies: latlong, connectivity, launch_review
- Updated all imports from latlong → latlong2
- Placeholder implementation for places autocomplete (feature temporarily disabled)

Remaining tasks (non-blocking for build):
- Complete null-safety fixes for _location variables in genericMap.dart
- Fix theme.dart MaterialTheme parameter issues
- Fix customStepper.dart null-safety issues
- Final build and testing

lib/redux/fetchDataMiddleware.dart

@@ -2,8 +2,7 @@ import 'dart:async';
 
 import 'package:fires_flutter/models/fireNotification.dart';
 import 'package:fires_flutter/models/yourLocation.dart';
-import 'package:flutter_simple_dependency_injection/injector.dart';
-import 'package:just_debounce_it/just_debounce_it.dart';
+import 'package:get_it/get_it.dart';
 import 'package:objectid/objectid.dart';
 import 'package:redux/redux.dart';
 
@@ -23,21 +22,27 @@ import 'actions.dart';
 // Middleware do not return any values themselves. They simply forward
 // actions on to the Reducer or swallow actions in some special cases.
 
-FiresApi api = Injector.getInjector().get<FiresApi>();
+FiresApi api = GetIt.instance<FiresApi>();
+
+// Simple debounce mechanism
+Timer? _locationUpdateDebounceTimer;
+
+void debounceLocationUpdate(Duration duration, Function() callback) {
+  _locationUpdateDebounceTimer?.cancel();
+  _locationUpdateDebounceTimer = Timer(duration, callback);
+}
 
 void fetchDataMiddleware(Store<AppState> store, action, NextDispatcher next) {
   // If our Middleware encounters a `FetchYourLocationAction`
 
   if (action is OnUserLangAction) {
     // I can create the user with the lang and the token
-    if (store.state.user.token != null)
-      createUser(store, action.lang, store.state.user.token);
+    createUser(store, action.lang, store.state.user.token);
   }
 
   if (action is OnUserTokenAction) {
     // I can create the user with the lang and the token
-    if (store.state.user.lang != null)
-      createUser(store, store.state.user.lang, action.token);
+    createUser(store, store.state.user.lang, action.token);
   }
 
   if (action is EditConfirmYourLocationAction) {
@@ -98,8 +103,8 @@ void fetchDataMiddleware(Store<AppState> store, action, NextDispatcher next) {
 
   if (action is UpdateYourLocationAction) {
     if (action.loc.subscribed)
-      Debounce.seconds(
-          2,
+      debounceLocationUpdate(
+          Duration(seconds: 2),
           () => api
               .getFiresInLocation(
                   state: store.state,
@@ -149,20 +154,18 @@ void fetchDataMiddleware(Store<AppState> store, action, NextDispatcher next) {
         // If it succeeds, dispatch a success action with the YourLocations.
         // Our reducer will then update the State using these YourLocations.
         print('Subscribed to: ${subscribedLocations.length}');
-        if (subscribedLocations is List) {
-          // unsubscribe all locally to sync the subs state
-          localLocations.forEach((location) => location.subscribed = false);
-          print('Local persisted: ${localLocations.length}');
-          subscribedLocations.forEach((subsLoc) {
-            var locSubs = localLocations.firstWhere(
-                (localLocation) => localLocation.id == subsLoc.id, orElse: () {
-              localLocations.add(subsLoc);
-              return subsLoc;
-            });
-            locSubs.subscribed = true;
+        // unsubscribe all locally to sync the subs state
+        localLocations.forEach((location) => location.subscribed = false);
+        print('Local persisted: ${localLocations.length}');
+        subscribedLocations.forEach((subsLoc) {
+          var locSubs = localLocations.firstWhere(
+              (localLocation) => localLocation.id == subsLoc.id, orElse: () {
+            localLocations.add(subsLoc);
+            return subsLoc;
           });
-        }
-
+          locSubs.subscribed = true;
+        });
+      
         store.dispatch(new FetchYourLocationsSucceededAction(localLocations));
         persistYourLocations(localLocations);
 
@@ -180,10 +183,8 @@ void fetchDataMiddleware(Store<AppState> store, action, NextDispatcher next) {
         });
 
         Completer<Null> completer = action.refreshCallback;
-        if (completer != null) {
-          completer.complete(null);
-        }
-      });
+        completer.complete(null);
+            });
     }).catchError((onError) {
       // If it fails, dispatch a failure action. The reducer will
       // update the state with the error.