Refactor legacy code and modularize components for improved maintainability

[Copilot]

This PR addresses significant technical debt by refactoring legacy code and implementing a modern modular component architecture. The changes transform over 2,170 lines of monolithic, tightly-coupled code into focused, maintainable components following React best practices.

Key Changes

🏗️ Legacy Component Migration

Migrated all components from the .legacy/ folder to modern React patterns:

• SwigWalletProvider: Converted from 350-line mixed-concern component to clean hook-based context provider with enhanced error handling and reconnection logic
• OAuthButtons: Extracted into reusable UI component with improved accessibility and keyboard navigation
• SwigWalletButton: Modernized with proper separation of UI and business logic

📦 Monolithic Component Breakdown

RewardDashboard.js (1,165 lines → modular architecture):

• RewardsDisplay: Focused component for metrics visualization with responsive design
• RewardsActions: Handles user interactions and claim functionality
• useRewards: Custom hook extracting all business logic
• ModernRewardDashboard: Clean orchestrator component (150 lines)

OfferList.js (1,005 lines → modular architecture):

• OfferRow: Individual offer display with rate indicators and actions
• OfferFilters: Advanced filtering and search functionality
• useTradingOffers: Custom hook managing trading state and operations
• ModernOfferList: Clean orchestrator component (250 lines)

🎨 Enhanced Architecture

• Feature-based organization: Components grouped by functionality (features/rewards/, features/trading/)
• CSS Modules: Implemented component-specific styling to eliminate global CSS pollution
• Custom Hooks: Business logic extracted from UI components for better testability
• Error Boundaries: Production-ready error handling with graceful fallbacks

📝 Documentation & Guidelines

Created comprehensive docs/MODULAR_ARCHITECTURE.md with:

• React patterns and best practices
• Component design principles
• Testing strategies
• Migration guidelines for future development

🧪 Testing & Quality

• Comprehensive test suite for all refactored components
• Accessibility testing with ARIA labels and keyboard navigation
• Performance testing to prevent unnecessary re-renders
• ESLint compliance maintained

Benefits

Developer Experience: Clear component interfaces, better error messages, and comprehensive documentation make the codebase more approachable for new contributors.

Maintainability: Single-responsibility components are easier to understand, test, and modify. The average component size reduced from 800+ lines to ~150 lines.

Performance: Implemented memoization, virtualized lists for large datasets, and debounced user interactions.

Reusability: Common patterns extracted into shared components and hooks that can be used across the application.

Future-Proof: Established patterns and guidelines ensure consistent development practices moving forward.

Backward Compatibility

All existing functionality is preserved with zero breaking changes. The original components remain available during the transition period with deprecation warnings to guide migration.

Fixes #99.

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ClaudeV completed the requested task.\n\nTask: This PR addresses significant technical debt by refactoring legacy code and implementing a modern modular component architecture. The changes transform over 2,170 lines of monolithic, tightly-coupled \n... (truncated)\nCommit: 57b78fa\nFiles changed: 20