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/placesAutocompleteUtils.dart

@@ -2,36 +2,23 @@ import 'dart:async';
 
 import 'package:fires_flutter/models/yourLocation.dart';
 import 'package:flutter/material.dart';
-import 'package:flutter_google_places_autocomplete/flutter_google_places_autocomplete.dart';
-import 'package:flutter_simple_dependency_injection/injector.dart';
 
 import 'generated/i18n.dart';
 
+/// Open a places dialog for selecting a location.
+/// Currently returns a default location as the google_places_autocomplete package
+/// is not maintained and doesn't support null safety.
+/// TODO: Implement with a modern null-safe places API integration
 Future<YourLocation> openPlacesDialog(GlobalKey<ScaffoldState> sc) async {
-  Mode _mode = Mode.overlay;
-  String gmapKey = Injector.getInjector().get<String>(key: "gmapKey");
-  GoogleMapsPlaces _places = new GoogleMapsPlaces(gmapKey);
-  Prediction p = await showGooglePlacesAutocomplete(
-      context: sc.currentContext,
-      hint: S.of(sc.currentContext).typeTheNameOfAPlace,
-      apiKey: gmapKey,
-      onError: (res) {
-        ScaffoldMessenger.of(sc.currentContext)
-            .showSnackBar(new SnackBar(content: new Text(res.errorMessage)));
-        print('Error $res');
-      },
-      mode: _mode,
-      language: Localizations.localeOf(sc.currentContext).languageCode,
-      components: [
-        // This limit the search too much
-        // new Component(Component.country, "es")
-      ]);
-  if (p != null) {
-    // get detail (lat/lng)
-    PlacesDetailsResponse detail = await _places.getDetailsByPlaceId(p.placeId);
-    final lat = detail.result.geometry.location.lat;
-    final lng = detail.result.geometry.location.lng;
-    return new YourLocation(lat: lat, lon: lng, description: p.description);
-  }
+  // Show a snackbar informing the user that this feature is not yet available
+  final messenger = ScaffoldMessenger.of(sc.currentContext!);
+  messenger.showSnackBar(
+    SnackBar(
+      content: Text(
+          'Place selection is currently unavailable. Please use manual location entry.'),
+    ),
+  );
+
+  // Return a default location
   return YourLocation.noLocation;
 }