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/attributionMapPlugin.dart

@@ -1,36 +1,23 @@
 import 'package:flutter/material.dart';
-import 'package:flutter_map/plugin_api.dart';
 
-class AttributionPluginOptions extends LayerOptions {
+/// Attribution widget for displaying map attribution text
+class AttributionPluginWidget extends StatelessWidget {
   final String text;
 
-  AttributionPluginOptions({this.text = ""});
-}
-
-class AttributionPlugin implements MapPlugin {
-  @override
-  Widget createLayer(
-      LayerOptions options, MapState mapState, Stream<Null> stream) {
-    if (options is AttributionPluginOptions) {
-      var style = new TextStyle(
-        // fontWeight: FontWeight.bold,
-        fontSize: 12.0,
-        color: Colors.white,
-      );
-      return Padding(
-        padding: const EdgeInsets.all(5.0),
-        child: new Text(
-          options.text,
-          style: style,
-        ),
-      );
-    }
-    throw ("Unknown options type for Attribution"
-        "plugin: $options");
-  }
+  AttributionPluginWidget({this.text = ""});
 
   @override
-  bool supportsLayer(LayerOptions options) {
-    return options is AttributionPluginOptions;
+  Widget build(BuildContext context) {
+    var style = new TextStyle(
+      fontSize: 12.0,
+      color: Colors.white,
+    );
+    return Padding(
+      padding: const EdgeInsets.all(5.0),
+      child: new Text(
+        text,
+        style: style,
+      ),
+    );
   }
 }