Adds the ObjectBox database dependency for local data persistence.
Updates the Product ID field type from nullable String to non-nullable int with a default value of 0 to align with ObjectBox's integer ID requirements. Includes necessary generated files for plugin registration and model serialization.
Replaces hardcoded colors and standard Theme.of(context) accesses with a custom AppTheme.
Introduces distinct light and dark themes and persists the selected theme mode using shared_preferences.
Integrates the theme into the main app structure and applies it to various components and pages.
Adds google_fonts dependency for theme typography.