Replaces the previous mock-based authentication in client settings with FirebaseAuth for sign out functionality. Updates dependencies and imports accordingly, and adds firebase_auth to the settings package and firebase_core to the client app. Also includes minor Dart type improvements and dependency reordering.
Updated the SettingsProfileHeader widget to use a lighter background, reduced the expanded height, and adjusted layout to a horizontal row with updated avatar and text styles. Added new spacing constants to UiConstants for improved layout control.
Standardized navigation route paths for client home, hubs, and settings to use '/client-home', '/client-hubs', and '/client-settings'. Added missing module imports and exports in main.dart and krow_data_connect.dart, including business_repository_mock.
Relocated all app directories (client, design_system_viewer, staff) and their contents under the new 'apps/mobile' path. This change improves project organization and prepares for future platform-specific structuring.
