Initial implementation of WooCommerce Composable Products plugin

Implemented custom WooCommerce product type allowing customers to build their own
product bundles by selecting from predefined sets of products.

Features:
- Custom "Composable Product" type with admin interface
- Product selection by category, tag, or SKU
- Configurable selection limits (global and per-product)
- Dual pricing modes: fixed price or sum of selected products
- Modern responsive frontend with Twig templates
- AJAX add-to-cart functionality
- Full internationalization support (.pot file)
- WooCommerce settings integration
- Comprehensive documentation

Technical implementation:
- PHP 8.3+ with PSR-4 autoloading
- Twig 3.0 templating engine via Composer
- Vanilla JavaScript with jQuery for frontend interactions
- WordPress and WooCommerce hooks for seamless integration
- Security: input sanitization, validation, and output escaping
- Translation-ready with text domain 'wc-composable-product'

Documentation:
- README.md: Project overview and features
- INSTALL.md: Installation and usage guide
- IMPLEMENTATION.md: Technical architecture
- CHANGELOG.md: Version history

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

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

includes/Product_Selector.php

@@ -0,0 +1,65 @@
+<?php
+/**
+ * Product Selector
+ *
+ * @package WC_Composable_Product
+ */
+
+namespace WC_Composable_Product;
+
+defined('ABSPATH') || exit;
+
+/**
+ * Product Selector Class
+ *
+ * Handles rendering the product selection interface
+ */
+class Product_Selector {
+    /**
+     * Render product selector
+     *
+     * @param Product_Type $product Composable product
+     */
+    public static function render($product) {
+        if (!$product || $product->get_type() !== 'composable') {
+            return;
+        }
+
+        $available_products = $product->get_available_products();
+        $selection_limit = $product->get_selection_limit();
+        $pricing_mode = $product->get_pricing_mode();
+
+        $show_images = get_option('wc_composable_show_images', 'yes') === 'yes';
+        $show_prices = get_option('wc_composable_show_prices', 'yes') === 'yes';
+        $show_total = get_option('wc_composable_show_total', 'yes') === 'yes';
+
+        // Prepare product data for template
+        $products_data = [];
+        foreach ($available_products as $available_product) {
+            $products_data[] = [
+                'id' => $available_product->get_id(),
+                'name' => $available_product->get_name(),
+                'price' => $available_product->get_price(),
+                'price_html' => $available_product->get_price_html(),
+                'image_url' => wp_get_attachment_image_url($available_product->get_image_id(), 'thumbnail'),
+                'permalink' => $available_product->get_permalink(),
+            ];
+        }
+
+        $context = [
+            'product_id' => $product->get_id(),
+            'products' => $products_data,
+            'selection_limit' => $selection_limit,
+            'pricing_mode' => $pricing_mode,
+            'show_images' => $show_images,
+            'show_prices' => $show_prices,
+            'show_total' => $show_total,
+            'fixed_price' => $product->get_price(),
+            'currency_symbol' => get_woocommerce_currency_symbol(),
+        ];
+
+        // Render template
+        $plugin = Plugin::instance();
+        echo $plugin->render_template('product-selector.twig', $context);
+    }
+}