Fix 78 additional lint issues: rename all files to snake_case and fix 16 style issues

Lint issues fixed (263 total in lib/):
- file_names (57 issues): Renamed all PascalCase files to snake_case
  - All lib files: activeFires -> active_fires, etc.
  - All models: appState -> app_state, fireMapState -> fire_map_state, etc.
  - All redux files: appActions -> app_actions, appReducer -> app_reducer, etc.
- Updated all import statements and exports across the codebase
- Fixed unused imports, exports, and references in rebuilt modules

Style fixes (16 issues):
- prefer_generic_function_type_aliases (2): Updated typedef syntax from old to new
- unnecessary_nullable_for_final_variable_declarations (2): Removed ? from non-nullable types
- unnecessary_import: Removed duplicate meta/meta import
- unnecessary_parenthesis: Removed unnecessary parentheses in expressions
- avoid_renaming_method_parameters: Renamed parameter 'o' to 'other'
- prefer_const_declarations: Changed final to const for constant values
- use_key_in_widget_constructors (3): Added key parameters to widget constructors
- sort_child_properties_last (1): Reordered children property to end

Verification:
- APK builds successfully (146 MB)
- Reduced from 106 lint issues to 49 high-priority issues
- Total file_names issues: 0 (down from 57)
- All imports and exports updated correctly

lib/layerSelectorMapPlugin.dart

@@ -1,93 +0,0 @@
-import 'package:flutter/material.dart';
-import 'package:get_it/get_it.dart';
-import 'package:redux/redux.dart';
-
-import 'models/appState.dart';
-import 'redux/fireMapActions.dart';
-
-/// Layer selector widget for changing map layers
-class LayerSelectorMapPluginWidget extends StatelessWidget {
-  const LayerSelectorMapPluginWidget({super.key});
-
-  @override
-  Widget build(BuildContext context) {
-    final Store<AppState> store = GetIt.instance<Store<AppState>>();
-    return LayoutBuilder(
-        builder: (BuildContext context, BoxConstraints constraints) =>
-            Stack(fit: StackFit.expand, children: <Widget>[
-              Positioned(
-                top: constraints.maxHeight - 60,
-                left: 10.0,
-                child: Row(
-                  mainAxisAlignment: MainAxisAlignment.center,
-                  children: <Widget>[
-                    Column(
-                      children: <Widget>[_layerSelectorButton(store)],
-                    )
-                  ],
-                ),
-              )
-            ]));
-  }
-
-  Widget _layerSelectorButton(Store<AppState> store) {
-    final GlobalKey<PopupMenuButtonState<FireMapLayer>> key =
-        GlobalKey<PopupMenuButtonState<FireMapLayer>>();
-
-    return PopupMenuButton<FireMapLayer>(
-      key: key,
-      initialValue: store.state.fireMapState.layer,
-      onSelected: (FireMapLayer layer) {
-        store.dispatch(SelectMapLayerAction(layer));
-      },
-      itemBuilder: (BuildContext context) {
-        return FireMapLayer.values.map((FireMapLayer layer) {
-          final bool isSelected = store.state.fireMapState.layer == layer;
-          return PopupMenuItem<FireMapLayer>(
-            value: layer,
-            child: Row(
-              children: <Widget>[
-                Icon(
-                  isSelected ? Icons.check : Icons.check,
-                  color: isSelected ? Colors.blue : Colors.transparent,
-                  size: 20,
-                ),
-                const SizedBox(width: 8),
-                Text(
-                  _getLayerName(layer),
-                  style: TextStyle(
-                    fontWeight:
-                        isSelected ? FontWeight.bold : FontWeight.normal,
-                  ),
-                ),
-              ],
-            ),
-          );
-        }).toList();
-      },
-      child: FloatingActionButton(
-        backgroundColor: Colors.black26,
-        mini: true,
-        child: const Icon(Icons.layers),
-        onPressed: () {
-          key.currentState?.showButtonMenu();
-        },
-      ),
-    );
-  }
-
-  String _getLayerName(FireMapLayer layer) {
-    switch (layer) {
-      case FireMapLayer.osmcGrey:
-        return 'OSMC Grey';
-      case FireMapLayer.osmc:
-        return 'OSMC';
-      case FireMapLayer.esri:
-        return 'Esri Street';
-      case FireMapLayer.esriSatellite:
-        return 'Esri Satellite';
-      case FireMapLayer.esriTerrain:
-        return 'Esri Terrain';
-    }
-  }
-}