Refactor Style Editor, Upgrade to Manifest V3, and Update Changelog

[momensalama]

Pull Request: Refactor Style Editor, Upgrade to Manifest V3, and Update Changelog

Description

This PR introduces a major refactoring of the Style Editor code, improving its structure, readability, and maintainability. It also includes an upgrade to Manifest V3 for Chrome extensions, as Manifest V2 is no longer supported. An updated changelog is included to document these changes.

Changes

• Refactored the entire codebase into a modular structure
• Upgraded the extension to Manifest V3
• Introduced modern JavaScript features and best practices
• Improved code organization and naming conventions
• Enhanced existing functionality with dedicated functions
• Created a comprehensive changelog

Changelog

## Version 2.0.0 (2024-09-15)

### Major Changes
- Refactored entire codebase into a modular structure using an IIFE
- Introduced `StyleEditor` module to encapsulate all functionality
- Upgraded to Manifest V3 for Chrome extension compatibility

### Added
- `CONSTANTS` object for centralized management of constant values
- `createElements` function to handle DOM element creation
- `setupEventListeners` function to centralize event listener attachment
- `generateSelector` function for creating CSS selectors
- `getExistingStyles` function to extract and format existing styles

### Changed
- Replaced var declarations with const and let for better scoping
- Updated to use modern JavaScript features (arrow functions, template literals)
- Improved naming conventions for better code readability
- Reorganized code structure for better modularity and maintainability
- Updated manifest.json to version 3 format

### Removed
- Removed global function declarations
- Eliminated direct manipulation of `String.prototype`
- Removed Manifest V2 specific configurations

### Improved
- Enhanced throttle function implementation
- Simplified event handling logic
- Improved code comments and overall documentation
- Ensured compatibility with current Chrome extension standards

Testing

• Verify that all existing functionality remains intact
• Test the Style Editor in multiple browsers
• Ensure that localStorage persistence still works correctly
• Check that keyboard shortcuts (Ctrl+M) function as expected
• Confirm that the extension loads and functions correctly with Manifest V3

Additional Notes

This refactoring maintains all original features while significantly improving the code quality and ensuring compatibility with the latest Chrome extension standards. It sets a foundation for easier future enhancements and maintenance.

Reviewers

@karthikv

Please review these changes and provide any feedback or suggestions for further improvements. Special attention should be given to the Manifest V3 upgrade to ensure all functionality is preserved.