Update documentation to v1.1.20 with current features

- Updated all version references to 1.1.20
- Updated WordPress requirement to 6.0+ (tested up to 6.9.x)
- Updated WooCommerce requirement to 8.0+ (tested up to 10.x)
- Added comprehensive file structure showing Twig templates
- Added WooCommerce Blocks compatibility documentation
- Added tier labels feature documentation (v1.1.7)
- Added quantity restrictions feature documentation (v1.1.0)
- Added new usage examples for tier labels and quantity restrictions
- Updated INSTALLATION.md with complete directory structure
- Updated README.md with current version changelog
- Updated QUICKSTART.md with 8 pro tips including new features
- Updated USAGE_EXAMPLES.md with 6 complete examples
- Documented WooCommerce Blocks support and v1.1.20 critical fix

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

README.md

@@ -110,12 +110,22 @@ When editing a product, scroll to the **Product data** panel:
 
 ```
 wc-tier-and-package-prices/
-├── wc-tier-and-package-prices.php    # Main plugin file
+├── wc-tier-and-package-prices.php    # Main plugin file (v1.1.20)
 ├── includes/
-│   ├── class-wc-tpp-admin.php        # Admin settings
+│   ├── class-wc-tpp-admin.php        # Admin settings integration
+│   ├── class-wc-tpp-settings.php     # WooCommerce settings page
 │   ├── class-wc-tpp-product-meta.php # Product meta boxes
-│   ├── class-wc-tpp-frontend.php     # Frontend display
-│   └── class-wc-tpp-cart.php         # Cart price calculations
+│   ├── class-wc-tpp-frontend.php     # Frontend display logic
+│   ├── class-wc-tpp-cart.php         # Cart price calculations
+│   └── class-wc-tpp-template-loader.php # Twig template engine
+├── templates/
+│   ├── admin/
+│   │   ├── tier-row.twig            # Tier pricing input row
+│   │   └── package-row.twig         # Package pricing input row
+│   └── frontend/
+│       ├── pricing-table.twig        # Main pricing display wrapper
+│       ├── tier-pricing-table.twig   # Tier pricing table
+│       └── package-pricing-display.twig # Package selection UI
 ├── assets/
 │   ├── css/
 │   │   ├── admin.css                 # Admin styles
@@ -123,7 +133,16 @@ wc-tier-and-package-prices/
 │   └── js/
 │       ├── admin.js                  # Admin JavaScript
 │       └── frontend.js               # Frontend JavaScript
-└── README.md
+├── languages/
+│   ├── wc-tier-package-prices.pot    # Translation template
+│   ├── wc-tier-package-prices-*.po   # Translation sources
+│   └── wc-tier-package-prices-*.mo   # Compiled translations
+├── vendor/                            # Composer dependencies (Twig)
+├── CHANGELOG.md                       # Complete version history
+├── INSTALLATION.md                    # Installation guide
+├── QUICKSTART.md                      # Quick start guide
+├── USAGE_EXAMPLES.md                  # Usage examples
+└── README.md                          # This file
 ```
 
 ## Requirements
@@ -164,39 +183,51 @@ This plugin is licensed under the GPL v2 or later.
 
 ## Changelog
 
-### Version 1.0.0 - 2025-12-21
+### Version 1.1.20 - 2025-12-23
 
-#### Compatibility Updates
+**Current Release** - Latest stable version with full WooCommerce Blocks support
 
-- ✅ Updated for WooCommerce 10.x compatibility
-- ✅ Updated for WordPress 6.9.x compatibility
-- ✅ Added HPOS (High-Performance Order Storage) support
-- ✅ Declared compatibility with WooCommerce Custom Order Tables
+#### Fixed
+- **CRITICAL:** WooCommerce Blocks fatal error in mini-cart and cart blocks
+- Fixed `woocommerce_store_api_product_quantity_editable` filter signature mismatch
+- Filter now correctly accepts `WC_Product` object instead of cart item array
+- Resolves "Cannot use object of type WC_Product_Simple as array" fatal error
 
-#### Security Enhancements
+#### Technical Details
+- Updated `block_quantity_editable()` method signature to accept product object
+- Changed parameter from `$cart_item` array to `WC_Product $product`
+- Uses `$product->get_id()` instead of array access for product ID
+- Full compatibility with WooCommerce Store API and block-based cart/checkout
 
-- ✅ Added nonce verification for product meta save operations
-- ✅ Added capability checks for user permissions
-- ✅ Enhanced data escaping and sanitization
-- ✅ Implemented autosave prevention
+### Recent Major Updates
 
-#### Code Improvements
+#### Version 1.1.7 - Enhanced Tier Pricing
+- Added optional text labels for tier pricing
+- Clickable tier rows that auto-populate quantity field
+- Add to Cart button auto-disable when quantity is invalid
 
-- ✅ Enhanced cart object validation
-- ✅ Improved product object type checking
-- ✅ Better error handling for edge cases
-- ✅ Updated data storage methods for cart items
-- ✅ Modernized JavaScript localization with proper escaping
+#### Version 1.1.4 - WooCommerce Blocks Support
+- Full support for WooCommerce block-based cart and checkout
+- Quantity restrictions work with both classic and block carts
+- Enhanced "View Options" button styling
 
-#### Initial Features
+#### Version 1.1.0 - Package Quantity Restrictions
+- Global and per-product package quantity restrictions
+- Prevents customers from ordering non-package quantities
+- Automatic quantity field hiding when restrictions enabled
 
-- Initial release with tier pricing functionality
-- Package pricing with fixed quantities
-- Customizable pricing tables
-- Global settings page
-- Product-level configuration
-- Cart integration with dynamic pricing
-- Responsive frontend design
+#### Version 1.0.1 - Twig Template Engine
+- Migrated to Twig templating system
+- Enhanced security with automatic HTML escaping
+- Added German (Switzerland, Informal) translation
+
+#### Version 1.0.0 - Initial Release
+- Tier pricing functionality (quantity-based discounts)
+- Package pricing functionality (fixed-price bundles)
+- WooCommerce HPOS compatibility
+- Multilingual support (English, German)
+
+For complete version history, see [CHANGELOG.md](CHANGELOG.md)
 
 ## Credits