Fix single product layout conflicts with WooCommerce CSS

WooCommerce's layout CSS fought Bootstrap's grid in three ways:

1. Float-based two-column layout (width: 48% + float) on div.images
   and div.summary squeezed content inside our col-lg-6 columns.
   Reset with float: none; width: 100%.

2. Nested content wrapper (.container + #primary + <main>) from
   woocommerce_output_content_wrapper doubled up on the parent
   theme's existing .container. Remove the hooks entirely.

3. Sale badge (position: absolute; top: -.5em; z-index: 9) escaped
   the image column and blocked breadcrumb clicks. Override to
   top: 0.5em; z-index: 1 and use gx-* (horizontal-only gutters)
   to avoid negative margin-top on the .row.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

templates/content-single-product.html.twig

@@ -34,9 +34,9 @@
 <div id="product-{{ product_id }}" class="{{ product_class }}">
 
     {# Two-column layout: images left, summary right #}
-    <div class="row g-4 g-lg-5 mb-5">
+    <div class="row gx-4 gx-lg-5 mb-5">
         {# Left column: Sale flash + Product images #}
-        <div class="col-lg-6">
+        <div class="col-lg-6 position-relative">
             {{ do_action('woocommerce_before_single_product_summary') }}
         </div>