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/themeDev.dart

@@ -7,13 +7,10 @@ final ThemeData devFiresTheme = _buildFiresTheme();
 ThemeData _buildFiresTheme() {
   final ThemeData base = ThemeData.light(); // light or dark
   return base.copyWith(
-    accentColor: fires900,
     primaryColor: Colors.pink,
-    buttonColor: fires900,
     scaffoldBackgroundColor: firesSurfaceWhite,
     cardColor: firesBackgroundWhite,
-    textSelectionTheme: TextSelectionThemeData(selectionColor: fires300),
-    errorColor: firesErrorRed,
+    textSelectionTheme: TextSelectionThemeData(selectionColor: fires300), colorScheme: ColorScheme.fromSwatch().copyWith(secondary: fires900), colorScheme: ColorScheme(error: firesErrorRed),
 
     //TODO: Add the text themes (103)
     //TODO: Add the icon themes (103)