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/monitoredAreas.dart

@@ -1,7 +1,7 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_map/flutter_map.dart';
 import 'package:flutter_redux/flutter_redux.dart';
-import 'package:latlong/latlong.dart';
+import 'package:latlong2/latlong.dart';
 
 import 'colors.dart';
 import 'customBottomAppBar.dart';
@@ -74,15 +74,15 @@ class MonitoredAreasPage extends StatelessWidget {
                         new Flexible(
                           child: new FlutterMap(
                             options: new MapOptions(
-                              center: new LatLng(53.5775, 3.106111),
-                              zoom: 1.0,
+                              initialCenter: new LatLng(53.5775, 3.106111),
+                              initialZoom: 1.0,
                             ),
-                            layers: [
-                              new TileLayerOptions(
+                            children: [
+                              new TileLayer(
                                   urlTemplate:
                                       "https://tiles.wmflabs.org/bw-mapnik/{z}/{x}/{y}.png",
                                   subdomains: ['a', 'b', 'c']),
-                              new PolylineLayerOptions(
+                              new PolylineLayer(
                                 polylines: view.monitoredAreas,
                               )
                             ],