add comprehensive test suite for style refactoring validation

[hamzaMissewi]

This commit introduces a robust test infrastructure to validate the recent style refactoring changes in shadcn-ui, ensuring consistency and reliability across the new style variants.

Key Additions

New Test Files

• style-refactoring.test.ts: Validates component import consistency and style variant structure
• component-differences.test.ts: Tests differences between base-lyra and radix-nova implementations
• validation.test.ts: Comprehensive validation utilities and integration tests

Enhanced Test Utilities

• test-helpers.ts: Advanced testing utilities including TestHelper, PerformanceMonitor, and TestDataGenerator classes
• Enhanced helpers.ts: Optimized command execution with better error handling and debugging

Updated Test Coverage

• registries.test.ts: Added style variant support tests
• search.test.ts: Enhanced with style variant search capabilities
• package.json: Added new test scripts (test:watch, test:ui, test:coverage)

Validation Features

Style Variant Consistency

• Import validation (@base-ui/react vs radix-ui)
• Component structure consistency across variants
• CSS variable naming convention validation
• Data-slot attribute consistency
• Export consistency validation

Performance Monitoring

• Execution time tracking for all test operations
• Memory usage monitoring
• Test suite performance benchmarks
• Debug mode with detailed timing information

Comprehensive Coverage

• Component addition and removal workflows
• Registry integration and authentication
• Style variant migration compatibility
• Error handling and edge cases
• Import/export type safety validation

Test Matrix Coverage

| Component | base-lyra | radix-nova | Validation Type | |-----------|-----------|-----------|-----------------| | Accordion | | | Import + Structure |
| Button | | | Export + CSS |
| Tooltip | | | Type Safety + Props |

Infrastructure Improvements

• Enhanced vitest configuration: Better timeout handling, retry logic, and reporting
• Comprehensive README: Detailed documentation with examples and troubleshooting
• Test data generators: Automated test data creation for consistent testing
• Performance benchmarks: Baseline performance metrics for test operations

Collaboration Benefits

This test suite provides:

• Reliable validation of style refactoring changes
• Consistent testing patterns for future development
• Performance monitoring for regression detection
• Comprehensive documentation for team onboarding
• Automated validation of component consistency

The test infrastructure ensures that the recent style refactoring (commit 7d718dd) maintains backward compatibility while providing a solid foundation for future style variant development.

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