Enhance StateProvider Test Coverage

Description The Neo.state.Provider has recently undergone a significant refactoring to integrate with the new Neo.core.Effect system and Neo.state.createHierarchicalDataProxy. While existing tests have been updated and are passing, there is a need to expand test coverage to ensure the robustness and reliability of the StateProvider under more complex scenarios.

Problem The current test suite for Neo.state.Provider (located at test/siesta/tests/state/Provider.mjs) primarily covers basic data manipulation and hierarchical access. It lacks comprehensive tests for advanced features and interactions, such as:

• Formulas
• Store management
• Two-way data binding

Without these tests, there's a risk of regressions or unexpected behavior when new features are added or existing ones are modified.

Proposed Solution Expand the test suite for Neo.state.Provider to include the following:

1. Formulas Testing:

   • Add tests for basic formula calculations.
   • Verify that formulas react correctly to changes in their dependencies.
   • Test formulas that depend on other formulas.

2. Store Management Testing:

   • Add tests for binding components to Neo.data.Store instances managed by the StateProvider.
   • Verify that changes within the store (e.g., adding/removing records, updating fields) correctly trigger updates in bound components.

3. Two-Way Binding Testing:

   • Implement tests for two-way binding between component configs and state provider data properties.
   • Ensure that changes originating from the component correctly update the state provider, and vice-versa.

Additional Context The recent refactoring of Neo.state.Provider to use Neo.core.Effect and Neo.state.createHierarchicalDataProxy has introduced a powerful new reactivity model. Comprehensive testing is crucial to validate this new architecture and prevent future issues.