feat(core_localization): add error translation utility and new error messages

feat(client_auth): implement error handling with localized messages
feat(client_hubs): implement error handling with localized messages
feat(client_billing): navigate to home after billing
feat(client_coverage): navigate to home after coverage
feat(client_create_order): navigate to home after create order
feat(client_settings): navigate to home after settings
feat(client_view_orders): show hub name in order card
fix(client_auth): handle existing firebase accounts during sign-up

This commit introduces a new utility function, `translateErrorKey`,
to translate error message keys to localized strings. It also adds
new error messages to the localization files for both English and
Spanish.

The commit also implements error handling with localized messages in
the client authentication and hubs features. This makes it easier for
users to understand what went wrong and how to fix it.

Additionally, the commit updates the navigation flow for the billing,
coverage, create order, and settings features to navigate to the home
page after the user completes the action.

Finally, the commit fixes a bug where the hub name was not being
displayed in the order card.

apps/mobile/packages/features/client/billing/lib/src/billing_module.dart

@@ -15,6 +15,9 @@ import 'presentation/pages/billing_page.dart';
 class BillingModule extends Module {
   @override
   void binds(Injector i) {
+    // Mock repositories (TODO: Replace with real implementations)
+    i.addSingleton<FinancialRepositoryMock>(FinancialRepositoryMock.new);
+
     // Repositories
     i.addSingleton<BillingRepository>(
       () => BillingRepositoryImpl(

apps/mobile/packages/features/client/billing/lib/src/presentation/pages/billing_page.dart

@@ -83,7 +83,7 @@ class _BillingViewState extends State<BillingView> {
                 leading: Center(
                   child: UiIconButton.secondary(
                     icon: UiIcons.arrowLeft,
-                    onTap: () => Modular.to.pop(),
+                    onTap: () => Modular.to.navigate('/client-main/home/'),
                   ),
                 ),
                 title: AnimatedSwitcher(