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/locationUtils.dart

@@ -3,8 +3,7 @@ import 'dart:async';
 import 'package:fires_flutter/models/yourLocation.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
-import 'package:flutter_simple_dependency_injection/injector.dart';
-import 'package:geocoder/geocoder.dart';
+import 'package:geocoding/geocoding.dart' as geo;
 import 'package:location/location.dart';
 
 import 'generated/i18n.dart';
@@ -49,13 +48,21 @@ Future<YourLocation> getUserLocation(
 }
 
 Future<String> getReverseLocation(
-    {@required lat, @required lon, bool external = false}) async {
-  final coordinates = new Coordinates(lat, lon);
-  var geoCoder = external
-      ? Geocoder.google(Injector.getInjector().get<String>(key: "gmapKey"))
-      : Geocoder.local;
-  var addresses = await geoCoder.findAddressesFromCoordinates(coordinates);
-  var first = addresses.first;
-  print("${first.featureName} : ${first.addressLine}");
-  return first.addressLine;
+    {required double lat, required double lon, bool external = false}) async {
+  try {
+    List<geo.Placemark> placemarks =
+        await geo.placemarkFromCoordinates(lat, lon);
+    if (placemarks.isNotEmpty) {
+      var first = placemarks.first;
+      String address =
+          '${first.street}, ${first.locality}, ${first.administrativeArea}, ${first.country}';
+      print("${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");
+  }
 }