feat: Implement comprehensive JLine Curses TUI library with focus indicators and repaint system

[gnodet]

🎯 Overview

This PR implements a complete Terminal User Interface (TUI) library for JLine with advanced focus indicators, smart repaint system, and comprehensive keyboard navigation.

🚀 Key Features

Core TUI Components

• Essential Components: List, Table, Tree, Input, Label, Button, TextArea
• Layout Containers: Box, Window, Panel for organizing components
• Interactive Demo: Complete CursesDemo showcasing all functionality

🎨 Visual Focus System

• Focus Indicators: Yellow borders and titles for focused components
• Theme Integration: Consistent styling through DefaultTheme
• Visual Feedback: Clear indication of which component has focus

⚡ Smart Repaint System

• Invalidation API: Components automatically invalidate on state changes
• Efficient Updates: Only invalid components are redrawn
• Focus-Aware: Automatic invalidation on focus changes
• Performance: Minimal screen updates for optimal performance

⌨️ Advanced Input Handling

• KeyEvent System: Comprehensive key event processing
• Keyboard Navigation: Arrow keys, Tab, Enter, Escape support
• Modifier Keys: Ctrl, Alt, Shift detection and handling
• Shortcut System: Configurable keyboard shortcuts

🧪 Quality Assurance

• Comprehensive Tests: 368+ tests across all modules
• Virtual Screen Testing: Mock screen for component testing
• Integration Tests: End-to-end functionality verification
• Code Quality: Spotless formatting and clean architecture

📦 Additional Features

• POSIX Commands: Comprehensive POSIX command implementation
• Build System: Clean Maven build with proper dependency management
• Cross-Platform: Updated both Unix and Windows build scripts
• Documentation: Updated module documentation and examples

🎮 Demo Usage

Users can now run the interactive demo:

# Unix/Linux/macOS
./build demo curses

# Windows
build.bat demo curses

🏗️ Architecture

The implementation follows TUI best practices from libraries like Ratatui and Cursive, providing:

• Component-based architecture with clear separation of concerns
• Event-driven design with proper input handling
• Efficient rendering with minimal screen updates
• Extensible theming system for customization

🔧 Technical Details

Focus Management

• Components track focus state and automatically invalidate when focus changes
• Visual indicators (yellow borders/titles) provide clear feedback
• Keyboard navigation follows standard TUI conventions

Repaint System

• Smart invalidation ensures only changed components are redrawn
• Efficient screen updates minimize terminal I/O
• Focus changes trigger automatic repaints

Input Processing

• Comprehensive KeyEvent system handles all input types
• Modifier key detection works across platforms
• Configurable shortcuts allow customization

✅ Testing

All tests pass:

• JLine Native Library: 3 tests
• JLine Terminal: 83 tests
• JLine Reader: 198 tests (3 skipped)
• JLine Style: 49 tests
• JLine Curses: 35 tests

Total: 368 tests passing

📋 Files Changed

• 42 files changed with 11,590 insertions and 2,012 deletions
• New curses components and infrastructure
• Enhanced demo with interactive examples
• Updated build scripts for cross-platform support
• Comprehensive test suite

🎯 Benefits

1. Modern TUI Development: Provides a complete toolkit for building terminal UIs
2. User Experience: Focus indicators and smooth navigation improve usability
3. Performance: Smart repaint system ensures efficient screen updates
4. Extensibility: Component-based architecture allows easy customization
5. Cross-Platform: Works consistently across Unix and Windows systems

This implementation brings JLine's terminal capabilities to the next level, enabling developers to create rich, interactive terminal applications with modern UX patterns.

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Pull Request opened by Augment Code with guidance from the PR author