refactor: Replace HubsConstants.googlePlacesApiKey with AppConfig.googlePlacesApiKey for better configuration management

apps/mobile/packages/core/lib/src/config/app_config.dart

@@ -1,5 +1,9 @@
+/// AppConfig class that holds configuration constants for the application.
+/// This class is used to access various API keys and other configuration values
+/// throughout the app.
 class AppConfig {
   AppConfig._();
 
+  /// The Google Places API key used for address autocomplete functionality.
   static const String googlePlacesApiKey = String.fromEnvironment('GOOGLE_PLACES_API_KEY');
 }

apps/mobile/packages/features/client/hubs/lib/src/data/repositories_impl/hub_repository_impl.dart

@@ -3,6 +3,7 @@ import 'dart:convert';
 import 'package:firebase_auth/firebase_auth.dart' as firebase;
 import 'package:firebase_data_connect/firebase_data_connect.dart';
 import 'package:http/http.dart' as http;
+import 'package:krow_core/core.dart';
 import 'package:krow_data_connect/krow_data_connect.dart' as dc;
 import 'package:krow_domain/krow_domain.dart' as domain;
 import 'package:krow_domain/krow_domain.dart'
@@ -262,7 +263,7 @@ class HubRepositoryImpl implements HubRepositoryInterface {
       <String, String>{
         'place_id': placeId,
         'fields': 'address_component',
-        'key': HubsConstants.googlePlacesApiKey,
+        'key': AppConfig.googlePlacesApiKey,
       },
     );
     try {

apps/mobile/packages/features/client/hubs/lib/src/presentation/widgets/hub_address_autocomplete.dart

@@ -2,6 +2,7 @@ import 'package:design_system/design_system.dart';
 import 'package:flutter/material.dart';
 import 'package:google_places_flutter/google_places_flutter.dart';
 import 'package:google_places_flutter/model/prediction.dart';
+import 'package:krow_core/core.dart';
 
 import '../../util/hubs_constants.dart';
 
@@ -24,7 +25,7 @@ class HubAddressAutocomplete extends StatelessWidget {
     return GooglePlaceAutoCompleteTextField(
       textEditingController: controller,
       focusNode: focusNode,
-      googleAPIKey: HubsConstants.googlePlacesApiKey,
+      googleAPIKey: AppConfig.googlePlacesApiKey,
       debounceTime: 500,
       countries: HubsConstants.supportedCountries,
       isLatLngRequired: true,

apps/mobile/packages/features/client/hubs/lib/src/util/hubs_constants.dart

@@ -1,6 +1,3 @@
-import 'package:krow_core/krow_core.dart';
-
 class HubsConstants {
-  static const String googlePlacesApiKey = AppConfig.googlePlacesApiKey;
   static const List<String> supportedCountries = <String>['us'];
 }