Bump version to 1.1.8 for release

Version 1.1.8 includes critical UI bug fixes:
- Admin rendering bug (tab visibility)
- Frontend product selector not appearing
- Price formatting localization

Updated CHANGELOG.md with comprehensive v1.1.8 release notes.

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

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

CHANGELOG.md

@@ -5,6 +5,42 @@ All notable changes to this 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).
 
+## [1.1.8] - 2025-12-31
+
+### Fixed
+
+- **CRITICAL**: Admin rendering bug where both General and Composable Options tabs showed simultaneously on initial page load
+- **CRITICAL**: Frontend product selector not appearing on product pages - WooCommerce's default add-to-cart button now hidden for composable products
+- **CRITICAL**: Price formatting not localized - prices now display with proper currency symbols, decimal separators, and thousand separators for all locales
+
+### Added
+
+- `wc_price()` Twig function for proper price formatting in templates
+- `formatPrice()` JavaScript method with full WooCommerce locale support
+- Price format localization data passed to frontend JavaScript (decimal/thousand separators, currency position, number of decimals)
+- `hide_default_add_to_cart()` method to prevent WooCommerce's default purchase UI for composable products
+
+### Changed
+
+- Enhanced CSS specificity with `!important` flags for proper tab visibility control
+- Template now uses `{{ fixed_price_html|raw }}` instead of raw currency concatenation
+- Product selector passes pre-formatted price HTML from `wc_price()` function
+- Frontend JavaScript updates prices dynamically using WooCommerce format settings
+
+### Technical
+
+- Modified files: assets/css/admin.css (+24 lines), includes/Cart_Handler.php (+14 lines), includes/Plugin.php (+7 lines), includes/Product_Selector.php (+2 lines), templates/product-selector.twig, assets/js/frontend.js (+28 lines)
+- All PHP files pass syntax validation
+- Supports Swiss format (CHF 50.-), European format (50,00 €), US format ($50.00), and all other WooCommerce locales
+- Thousand separator support: comma (1,000), dot (1.000), apostrophe (1'000), space (1 000)
+
+### Notes
+
+- This release fixes all three critical UI bugs reported in CLAUDE.md
+- Admin tabs now display correctly on initial page load without JavaScript flicker
+- Frontend product selector is now the only purchase interface (no WooCommerce default button)
+- All prices maintain proper locale formatting during dynamic updates
+
 ## [1.1.7] - 2025-12-31
 
 ### Added