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/dummyMapPlugin.dart

@@ -1,26 +1,9 @@
 import 'package:flutter/material.dart';
-import 'package:flutter_map/plugin_api.dart';
 
-class DummyMapPluginOptions extends LayerOptions {
-  final String text;
-
-  DummyMapPluginOptions({this.text = ""});
-}
-
-// https://github.com/apptreesoftware/flutter_map/blob/master/flutter_map_example/lib/pages/plugin_api.dart
-class DummyMapPlugin extends MapPlugin {
+/// Dummy/placeholder widget for map plugins
+class DummyMapPluginWidget extends StatelessWidget {
   @override
-  Widget createLayer(
-      LayerOptions options, MapState mapState, Stream<Null> stream) {
-    if (options is DummyMapPluginOptions) {
-      return const SizedBox();
-    }
-    throw ("Unknown options type for DummyMapPlugin"
-        "plugin: $options");
-  }
-
-  @override
-  bool supportsLayer(LayerOptions options) {
-    return options is DummyMapPluginOptions;
+  Widget build(BuildContext context) {
+    return const SizedBox();
   }
 }