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/globalFiresBottomStats.dart

@@ -2,7 +2,7 @@ import 'dart:convert';
 
 import 'package:comunes_flutter/comunes_flutter.dart';
 import 'package:flutter/material.dart';
-import 'package:flutter_simple_dependency_injection/injector.dart';
+import 'package:get_it/get_it.dart';
 import 'package:http/http.dart' as http;
 
 import 'colors.dart';
@@ -18,7 +18,7 @@ class GlobalFiresBottomStats extends StatefulWidget {
 class _GlobalFiresBottomStatsState extends State<GlobalFiresBottomStats> {
   String lastCheck;
   int activeFires = 0;
-  final firesApiUrl = Injector.getInjector().get<String>(key: "firesApiUrl");
+  final firesApiUrl = GetIt.instance<String>(instanceName: "firesApiUrl");
 
   @override
   void initState() {
@@ -54,7 +54,7 @@ class _GlobalFiresBottomStatsState extends State<GlobalFiresBottomStats> {
         color: fires100,
         mainAxisAlignment: MainAxisAlignment.center,
         actions: listWithoutNulls(<Widget>[
-          activeFires > 0 && lastCheck != null
+          activeFires > 0
               ? new Column(
                   mainAxisSize: MainAxisSize.min,
                   crossAxisAlignment: CrossAxisAlignment.center,