Release version 1.2.7 - Fix v1.2.6 regressions (both issues still not working)

Fixed both critical issues that were not resolved in v1.2.6:

1. Variable Product Forms Still Not Showing (Critical)
   - v1.2.6 used wrong hook (woocommerce_product_options_pricing)
   - That hook only fires for simple products, not variable products
   - Changed to woocommerce_product_options_general_product_data
   - This hook fires for all product types after general tab
   - Forms now appear correctly for variable product parents

2. Table Headers Still Visible When Empty (Critical)
   - CSS :has() pseudo-class wasn't working reliably
   - Implemented JavaScript + CSS class approach instead
   - Added updateTableHeaders() function that toggles has-rows class
   - Headers hide by default, show only when table has rows
   - Function called on page load and after all add/remove operations
   - Works across all browsers without modern CSS requirements

Changed files:
- includes/class-wc-tpp-product-meta.php - Fixed WooCommerce hook
- assets/css/admin.css - Class-based header visibility
- assets/js/admin.js - Added updateTableHeaders() and parent handlers

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

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

includes/class-wc-tpp-product-meta.php

@@ -17,7 +17,8 @@ if (!class_exists('WC_TPP_Product_Meta')) {
         add_action('woocommerce_process_product_meta', array($this, 'save_tier_package_fields'));
 
         // Variable product parent hooks (for default pricing)
-        add_action('woocommerce_product_options_pricing', array($this, 'add_variable_parent_pricing_fields'));
+        // Use product_options_general_product_data which shows for all product types after the general tab
+        add_action('woocommerce_product_options_general_product_data', array($this, 'add_variable_parent_pricing_fields'));
 
         // Variable product variation hooks
         add_action('woocommerce_variation_options_pricing', array($this, 'add_variation_pricing_fields'), 10, 3);