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

APPWRITE_PERMISSIONS_FIX.md

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+# 🔐 AppWrite Permissions Fix Guide
+
+## Current Issue ❌
+**Error**: "401 Unauthorized - The current user is not authorized to perform the requested action"
+
+**Cause**: Your AppWrite collections have incorrect permissions. Users cannot access their own data.
+
+## Quick Fix Steps ✅
+
+### Step 1: Access AppWrite Console
+1. Go to: https://appwrite.webklar.com
+2. Login with your credentials
+3. Select project: `6963df38003b96dab5aa`
+4. Go to: Databases → `amazon-extension-db`
+
+### Step 2: Fix Permissions for Each Collection
+
+**For EACH of these 5 collections**:
+- `amazon-ext-enhanced-items`
+- `amazon-ext-saved-products`
+- `amazon_ext_blacklist`
+- `amazon-ext-enhanced-settings`
+- `amazon-ext-migration-status`
+
+**Do this**:
+1. **Click on the collection name**
+2. **Click "Settings" tab** (not "Attributes")
+3. **Scroll down to "Permissions" section**
+4. **Set these exact permissions**:
+
+   **Create Permission**:
+   - Click "Add a permission"
+   - Select: `users` (any authenticated user can create)
+   - Click "Add"
+
+   **Read Permission**:
+   - Click "Add a permission" 
+   - Select: `user:$userId` (users can only read their own data)
+   - Click "Add"
+
+   **Update Permission**:
+   - Click "Add a permission"
+   - Select: `user:$userId` (users can only update their own data)
+   - Click "Add"
+
+   **Delete Permission**:
+   - Click "Add a permission"
+   - Select: `user:$userId` (users can only delete their own data)
+   - Click "Add"
+
+5. **Click "Update" to save**
+
+### Step 3: Verify Fix
+1. **Reload your extension** in Chrome
+2. **Go to Amazon** (amazon.de/s?k=smartphone)
+3. **Check console** - should see no more 401 errors
+4. **Test Enhanced Items** - should work without permission errors
+
+## What These Permissions Mean 📋
+
+- **`users`**: Any authenticated (logged-in) user
+- **`user:$userId`**: Only the user whose ID matches the document's `userId` field
+
+This ensures **data isolation** - each user can only see and modify their own data!
+
+## Expected Result ✅
+
+After fixing permissions, you should see:
+```
+✅ AppWrite connection successful
+✅ Collections accessible with correct permissions
+✅ Real-time sync working
+✅ No more 401 Unauthorized errors
+✅ Users can only access their own data
+```
+
+## Alternative: Temporary Testing Fix 🧪
+
+If you want to test quickly, you can temporarily set ALL permissions to `users`:
+- Create: `users`
+- Read: `users` 
+- Update: `users`
+- Delete: `users`
+
+**⚠️ WARNING**: This allows all users to see all data! Only use for testing, then change back to `user:$userId` for production.
+
+## Troubleshooting 🔧
+
+**Still getting 401 errors?**
+1. Make sure you're logged in to the extension
+2. Check that all 5 collections have the correct permissions
+3. Try logging out and back in to the extension
+4. Clear browser cache and reload extension
+
+**Can't find permissions section?**
+1. Make sure you're in the "Settings" tab (not "Attributes")
+2. Scroll down - permissions are at the bottom
+3. You need admin access to the AppWrite project
+
+**Permission options not showing?**
+1. Make sure you have the correct AppWrite version
+2. Check that you have admin rights to the project
+3. Try refreshing the AppWrite console page