This pull request introduces a comprehensive update to the Chrome extension, migrating it from Manifest V2 to Manifest V3, converting the codebase to TypeScript, and modernizing the build system with Vite. These changes improve performance, security, and developer experience while ensuring compliance with the latest Chrome Web Store requirements. Key updates include a complete overhaul of the extension's architecture, enhanced documentation, and a new testing infrastructure.

Major Migration: Manifest V2 → V3

• Updated manifest.json to Manifest V3, replacing "browser_action" with "action", switching to a service worker for background scripts, and updating the Content Security Policy. Removed the "activeTab" permission for enhanced security.

TypeScript Conversion

• Rewrote the extension in TypeScript, adding type definitions in src/types/index.ts for improved type safety. Key files include src/background.ts, src/content-script.ts, and src/popup.ts. [1] [2] [3]
• Added a tsconfig.json file with strict mode enabled and an ES2022 target.

Build System Modernization

• Integrated Vite as the build tool with a multi-entry setup, path aliases, and automatic file copying for assets. Configuration is defined in vite.config.ts.
• Updated package.json with modern dependencies and NPM scripts for development, building, and type-checking.

Testing Infrastructure

• Introduced a test-app/ directory with a Node.js server and sample web application for local testing of the extension. [1] [2]

Documentation Updates

• Enhanced README.md and DEVELOPER.md with updated setup instructions, build commands, and testing guidelines. [1] [2]

See changelog.