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

.env.example

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+# GenAI Browser Tool - Environment Configuration
+# Copy this file to .env and configure your API keys
+
+# OpenAI Configuration
+OPENAI_API_KEY=sk-your-openai-api-key-here
+OPENAI_MODEL=gpt-4
+OPENAI_MAX_TOKENS=4000
+
+# Anthropic Claude Configuration
+ANTHROPIC_API_KEY=sk-ant-your-anthropic-api-key-here
+ANTHROPIC_MODEL=claude-3-sonnet-20240229
+ANTHROPIC_MAX_TOKENS=4000
+
+# Google Gemini Configuration
+GOOGLE_API_KEY=AIza-your-google-api-key-here
+GOOGLE_MODEL=gemini-pro
+
+# Development Configuration
+NODE_ENV=development
+DEBUG_LOGGING=true
+ENABLE_ANALYTICS=false
+
+# API Configuration
+API_TIMEOUT=10000
+RATE_LIMIT_REQUESTS=50
+RATE_LIMIT_WINDOW=3600000
+
+# Extension Configuration
+EXTENSION_ID=your-extension-id-here
+DEVELOPMENT_MODE=true
+
+# Security Configuration
+CSP_REPORT_ONLY=false
+ENABLE_CONTENT_VALIDATION=true
+MAX_CONTENT_LENGTH=50000
+
+# Testing Configuration
+TEST_TIMEOUT=30000
+COVERAGE_THRESHOLD=70
+
+# Deployment Configuration
+DEPLOY_TARGET=development
+VERCEL_TOKEN=your-vercel-token-here
+RAILWAY_TOKEN=your-railway-token-here

.github/pull_request_template.md

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+## Description
+
+Provide a brief description of the changes made in this pull request.
+
+## Type of Change
+
+- [ ] Bug fix (non-breaking change which fixes an issue)
+- [ ] New feature (non-breaking change which adds functionality)
+- [ ] Breaking change (fix or feature that would cause existing functionality to change)
+- [ ] Documentation update
+- [ ] Code refactoring
+- [ ] Performance improvement
+- [ ] Test coverage improvement
+
+## Related Issues
+
+- Closes #(issue number)
+- Fixes #(issue number)
+- Relates to #(issue number)
+
+## Changes Made
+
+### Core Changes
+- [ ] List specific changes made to core functionality
+- [ ] Include any architectural changes
+- [ ] Note any new dependencies added
+
+### UI/UX Changes
+- [ ] Describe any user interface changes
+- [ ] Include screenshots if applicable
+- [ ] Note any accessibility improvements
+
+### API Changes
+- [ ] Document any API changes
+- [ ] Note breaking changes
+- [ ] Update version numbers if needed
+
+## Testing
+
+### Automated Testing
+- [ ] Unit tests pass (`npm test`)
+- [ ] E2E tests pass (`npm run test:e2e`)
+- [ ] Coverage threshold met (`npm run test:coverage`)
+- [ ] Linting passes (`npm run lint`)
+- [ ] Type checking passes (`npm run typecheck`)
+
+### Manual Testing
+- [ ] Extension loads without errors in Chrome
+- [ ] Extension loads without errors in Edge
+- [ ] Context menus function correctly
+- [ ] Popup opens and functions correctly
+- [ ] Background service worker initializes
+- [ ] Content scripts inject properly
+- [ ] AI providers respond correctly
+- [ ] Error handling works as expected
+
+### Browser Compatibility
+- [ ] Chrome (version 88+)
+- [ ] Edge (version 88+)
+- [ ] Tested in incognito/private mode
+
+## Security Considerations
+
+- [ ] Input validation implemented
+- [ ] XSS prevention measures in place
+- [ ] API keys handled securely
+- [ ] Content Security Policy updated if needed
+- [ ] No sensitive data exposed in logs
+
+## Performance Impact
+
+- [ ] No significant performance degradation
+- [ ] Memory usage is reasonable
+- [ ] API calls are optimized
+- [ ] Caching implemented where appropriate
+- [ ] Bundle size impact is minimal
+
+## Documentation
+
+- [ ] README.md updated if needed
+- [ ] CONTRIBUTING.md updated if needed
+- [ ] Code comments added for complex logic
+- [ ] JSDoc comments added for new functions
+- [ ] CHANGELOG.md updated
+
+## Screenshots
+
+<!-- Include screenshots for UI changes -->
+
+## Additional Notes
+
+<!-- Add any additional context, concerns, or notes for reviewers -->
+
+## Checklist
+
+- [ ] I have performed a self-review of my code
+- [ ] I have commented my code, particularly in hard-to-understand areas
+- [ ] I have made corresponding changes to the documentation
+- [ ] My changes generate no new warnings
+- [ ] I have added tests that prove my fix is effective or that my feature works
+- [ ] New and existing unit tests pass locally with my changes
+- [ ] Any dependent changes have been merged and published

CHANGELOG.md

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+# Changelog
+
+All notable changes to the GenAI Browser Tool project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+### Added
+- Comprehensive build system with rollup extension configuration
+- MIT LICENSE file for legal compliance
+- Comprehensive CONTRIBUTING.md with development guidelines
+- Complete test framework with Vitest and Playwright
+- Extension icons in all required sizes (16x16, 32x32, 48x48, 128x128)
+- Environment configuration template (.env.example)
+- GitHub pull request template
+- Comprehensive test coverage for core functionality
+
+### Fixed
+- Manifest file paths corrected to match actual file structure
+- Background service worker path updated for proper loading
+- Content script paths aligned with project structure
+- Extension icons now exist and are properly referenced
+- Content Security Policy strengthened for better security
+
+### Changed
+- Improved development workflow with proper build configuration
+- Enhanced security validation and input sanitization
+- Updated project structure for better maintainability
+
+### Security
+- Strengthened Content Security Policy
+- Added comprehensive input validation and sanitization
+- Improved API key handling and storage security
+
+## [4.1.0] - 2024-11-03
+
+### Added
+- Multi-provider AI support (OpenAI, Anthropic, Google Gemini)
+- Advanced content summarization with customizable options
+- Contextual Q&A functionality
+- Translation capabilities
+- Sentiment analysis features
+- Smart bookmarking with AI-generated metadata
+- Context menu integration for quick actions
+- Keyboard shortcuts for common operations
+- Comprehensive error handling and logging
+- Analytics tracking for performance monitoring
+
+### Security
+- Content Security Policy implementation
+- Input validation and sanitization
+- Secure API key storage
+
+## [4.0.0] - Previous Release
+
+### Added
+- Initial extension architecture
+- Basic AI provider integration
+- Popup interface
+- Options page
+- Background service worker
+- Content scripts
+
+---
+
+## Release Guidelines
+
+### Version Numbering
+- **MAJOR**: Breaking changes that require user action
+- **MINOR**: New features that are backward compatible
+- **PATCH**: Bug fixes that are backward compatible
+
+### Change Categories
+- **Added**: New features
+- **Changed**: Changes in existing functionality
+- **Deprecated**: Soon-to-be removed features
+- **Removed**: Removed features
+- **Fixed**: Bug fixes
+- **Security**: Security improvements
+
+### Release Process
+1. Update version in package.json and manifest.json
+2. Update CHANGELOG.md with release notes
+3. Create release branch
+4. Run full test suite
+5. Create GitHub release
+6. Deploy to Chrome Web Store (maintainers only)