Implement comprehensive settings modal with:
- Theme switching (light/dark/auto) with system preference detection
- Language selection for 17 languages with native name sorting
- Developer mode with detailed logging and log viewer
- About section with app info and external links
- Update notification improvements with reduced log spam
Technical improvements:
- Added ThemeContext with persistent state management
- Implemented memory-safe log file reading (5MB limit)
- Fixed all ESLint, TypeScript, and Clippy warnings
- Added JSDoc documentation for public APIs
- Updated README.md and DEVELOPMENT.md with new features
- Added a comprehensive table of contents for easier navigation.
- Expanded prerequisites section with specific version requirements and platform-specific dependencies.
- Introduced a detailed step-by-step setup process, including automated installation scripts.
- Added a dedicated development workflow section with available commands and daily usage patterns.
- Clarified build instructions and outputs for distribution.
- Enhanced overall formatting and organization.
