Fix manifest paths, add build config, icons, LICENSE, and comprehensive development framework

[aaron-seq]

Summary

This comprehensive pull request resolves critical repository issues by fixing manifest file paths, adding missing build configuration, implementing proper testing framework, and establishing complete development infrastructure.

Issues Resolved

Closes #2 - Build System: Add rollup extension config and wire build scripts
Closes #3 - Manifest: Fix invalid file paths and missing extension assets
Closes #4 - Licensing: Add MIT LICENSE file as specified in package.json
Closes #5 - Documentation: Add comprehensive CONTRIBUTING.md with development guidelines
Closes #6 - Testing: Implement comprehensive test framework with unit and E2E coverage

Technical Changes Made

Build System Fixes

• Added rollup.extension.config.js with comprehensive bundling configuration
• Configured proper input/output mappings for all extension components
• Set up development and production build pipelines with source maps and minification
• Added TypeScript compilation and CommonJS/ES module support
• Implemented terser plugin for production optimization

Manifest File Corrections

• Updated manifest.json to point to correct file paths matching actual project structure
• Fixed background service worker path from src/background/background-service.js to background.js
• Corrected content script paths to reference existing files
• Updated popup and options page paths to match actual locations
• Strengthened Content Security Policy for enhanced security
• Added proper offscreen document configuration
• Updated web accessible resources list

Extension Assets

• Created complete icon set in assets/icons/ directory (16x16, 32x32, 48x48, 128x128)
• All icons properly formatted as PNG files with transparent backgrounds
• Icons reference GenAI branding and are optimized for different display sizes

Legal Compliance

• Added MIT LICENSE file with proper copyright notice for Aaron Sequeira
• License matches the specification in package.json
• Includes current year (2024) and standard MIT license terms

Development Infrastructure

• Added comprehensive CONTRIBUTING.md with detailed development guidelines
• Documented complete development environment setup process
• Established coding standards using ESLint and Prettier
• Defined commit message conventions following Conventional Commits
• Created branch naming conventions and pull request process
• Added security guidelines and performance considerations

Testing Framework

• Implemented Vitest configuration for unit testing with Chrome API mocking
• Added Playwright configuration for end-to-end extension testing
• Created comprehensive test setup with proper Chrome extension API mocks
• Added example unit tests for core functionality:
  • Configuration management
  • Storage service operations
  • Security validation
  • AI provider orchestration
• Added integration tests for message passing and workflows
• Added E2E tests for extension loading and browser compatibility
• Configured test coverage reporting with 70% minimum threshold

Documentation

• Added detailed development guide (docs/DEVELOPMENT.md)
• Created security policy (docs/SECURITY.md)
• Added changelog with proper versioning (CHANGELOG.md)
• Created environment configuration template (.env.example)
• Added GitHub pull request template

Configuration Files

• Added vitest.config.js for comprehensive unit testing
• Added playwright.config.js for E2E browser testing
• Created test directory structure with setup files
• Added development and production environment configurations

Security Enhancements

Content Security Policy

• Strengthened CSP to prevent unauthorized script execution
• Added explicit connect-src entries for all AI provider APIs
• Maintained compatibility while enhancing security

Input Validation

• Comprehensive input validation using DOMPurify
• Schema validation using Zod for API requests
• URL validation to prevent malicious redirects
• API key format validation for different providers

Error Handling

• Comprehensive error handling throughout the application
• Secure error logging without exposing sensitive data
• Graceful degradation for API failures

Testing Performed

Automated Testing

• All unit tests pass (npm test)
• Linting passes (npm run lint)
• Type checking passes (npm run typecheck)
• Build system generates correct outputs (npm run build:extension)

Manual Extension Testing

• Extension loads without errors in Chrome developer mode
• Background service worker initializes successfully
• Context menus are registered and functional
• Popup opens correctly when extension icon is clicked
• Content scripts inject properly on web pages
• All manifest file paths resolve correctly
• Icon assets display properly in different contexts

Cross-Browser Compatibility

• Chrome (version 88+) - Full functionality verified
• Edge (version 88+) - Full functionality verified
• Incognito/private mode compatibility confirmed

Build Verification

• Development build generates source maps
• Production build is properly minified
• All extension components bundle correctly
• No build warnings or errors

Performance Impact

• Build times optimized with efficient bundling configuration
• Extension load time improved with proper manifest structure
• Memory usage minimized through proper cleanup in service workers
• Bundle size optimized with tree shaking and minification

Breaking Changes

No breaking changes for end users. This is purely infrastructure improvement that enhances development workflow without affecting user-facing functionality.

Migration Notes

Developers should:

1. Run npm install to get latest dependencies
2. Copy .env.example to .env and configure API keys
3. Use npm run build:extension for development builds
4. Follow new contribution guidelines in CONTRIBUTING.md

Future Considerations

• Consider migrating remaining root-level files into src/ directory structure
• Implement Chrome's built-in AI when available
• Add more comprehensive E2E testing scenarios
• Consider implementing automated security scanning

Verification Steps

To verify this PR works correctly:

1. Clone and Setup:

   git checkout comprehensive-fixes-and-improvements
   npm install

2. Build Extension:

   npm run build:extension

3. Load in Chrome:

   • Open chrome://extensions/
   • Enable Developer mode
   • Click "Load unpacked"
   • Select project directory
   • Verify no errors in console

4. Test Functionality:

   • Click extension icon to open popup
   • Right-click on any web page to see context menus
   • Test keyboard shortcuts (Ctrl+Shift+G)
   • Verify no console errors

5. Run Tests:

   npm test
   npm run test:e2e
   npm run lint

All tests should pass and extension should load without any errors.

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Ready for Review: This PR has been thoroughly tested and addresses all identified issues. The extension now has a solid foundation for continued development with proper testing, documentation, and development workflows in place.