chore: initialize project repository with core extension files

- Add .gitignore to exclude node_modules, dist, logs, and system files
- Add comprehensive project documentation including README, deployment guide, and development setup
- Add .kiro project specifications for amazon-product-bar-extension, appwrite-cloud-storage, appwrite-userid-repair, blacklist-feature, and enhanced-item-management
- Add .kiro steering documents for product, structure, styling, and tech guidelines
- Add VSCode settings configuration for consistent development environment
- Add manifest.json and babel/vite configuration for extension build setup
- Add complete source code implementation including AppWrite integration, storage managers, UI components, and services
- Add comprehensive test suite with Jest configuration and 30+ test files covering all major modules
- Add test HTML files for integration testing and validation
- Add coverage reports and build validation scripts
- Add AppWrite setup and repair documentation for database schema management
- Add migration guides and responsive accessibility implementation documentation
- Establish foundation for Amazon product bar extension with full feature set including blacklist management, enhanced item workflows, and real-time synchronization

.kiro/steering/tech.md

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+# Technology Stack & Build System
+
+## Core Technologies
+
+- **React 18**: UI framework for components (StaggeredMenu, panels)
+- **GSAP 3.12+**: Animation library for smooth menu transitions
+- **Vite 6.0+**: Build tool and development server
+- **Jest 30+**: Testing framework with jsdom environment
+- **Babel**: JavaScript transpilation for compatibility
+- **Chrome Extension Manifest V3**: Extension platform
+
+## Build System
+
+### Development Commands
+```bash
+# Install dependencies
+npm install
+
+# Development build with watch mode
+npm run dev
+
+# Production build
+npm run build
+
+# Run tests
+npm run test
+
+# Run tests in watch mode
+npm run test:watch
+```
+
+### Build Configuration
+- **Entry Point**: `src/content.jsx`
+- **Output**: `dist/content.js` and `dist/style.css`
+- **No code splitting**: Single bundle for extension compatibility
+- **CSS bundling**: All styles combined into single file
+- **Minification**: Disabled for debugging
+
+## Extension Development Workflow
+
+1. Run `npm run dev` for watch mode
+2. Load unpacked extension in Chrome (`chrome://extensions/`)
+3. After code changes, reload extension in Chrome
+4. Refresh Amazon page to see changes
+
+## Testing Setup
+
+- **Environment**: jsdom for DOM simulation
+- **Mocks**: localStorage, Chrome APIs
+- **Property-based testing**: fast-check for robust test cases
+- **Setup file**: `jest.setup.js` for test environment configuration
+
+## Key Dependencies
+
+- **gsap**: Animation engine for menu transitions
+- **react/react-dom**: UI framework and rendering
+- **@vitejs/plugin-react**: Vite React integration
+- **jest-environment-jsdom**: DOM testing environment
+- **fast-check**: Property-based testing library
+
+## Browser Compatibility
+
+- Chrome/Chromium-based browsers
+- Manifest V3 compliance
+- ES6+ features (modules, async/await, classes)
+- Modern DOM APIs (MutationObserver, localStorage)