Create Building model with associations, validations, and methods for construction and demolition progress. Add migration to create buildings table with necessary fields and foreign keys. Include FactoryBot factory for buildings and RSpec tests to validate model behavior and instance methods.

Update the level validation to ensure only integer values greater than zero are accepted. Modify the current_effect method to retrieve effects based on the building's level instead of a direct multiplication. Adjust related tests to reflect the change in error messaging for unique building types within star systems.

…stem model

Refactor the tax revenue calculation in MaintenanceJob to sum tax income from each star system using the new calculate_tax_income method. Add methods for calculating tax income and tax modifiers based on operational buildings in the StarSystem model. Update tests to validate the new functionality and ensure accurate tax calculations.

…Gemfile.lock; enhance MaintenanceJob to manage building statuses during maintenance tasks with corresponding tests.

Implement BuildingsController to handle building creation and destruction with necessary authorization checks. Update routes to include buildings resource. Enhance star system edit view to display available buildings, their costs, and construction progress. Add modal for confirming building construction. Update Gemfile to include selenium-webdriver for testing. Add feature tests for building construction and demolition scenarios, ensuring proper resource management and user feedback.

…nd tests

Remove unused database_cleaner dependencies from Gemfile.lock. Update README to reflect changes in Ruby version and add details about the new building system, including setup instructions and testing notes. Modify the building construction confirmation modal for improved visibility and update feature tests to ensure proper functionality of the building construction process.

Add frozen string literal comment to multiple files for performance optimization. Standardize string delimiters to single quotes throughout the codebase. Clean up whitespace and formatting in various files, including controllers, models, and views, to improve readability and maintainability. Update tests to reflect these changes and ensure consistent behavior across the application.