Add Bootstrap 5 product archive with card grid and sidebar

Replace WooCommerce's default shop/category page rendering with a
Bootstrap 5 card grid layout featuring responsive columns, sale badges,
star ratings, and an offcanvas sidebar for filters on mobile.

Key implementation details:

- Bypass parent theme's TemplateController for product archives via
  wp_bootstrap_should_render_template filter, render at template_redirect
  priority 11 using the same page shell injection pattern as plugin pages

- Add archive-product.php (Bootstrap layout with optional sidebar) and
  content-product.php (PHP bridge for wc_get_template_part interception)

- Inject global $product into Twig context in TemplateOverride to fix
  empty price/add-to-cart/rating/sale-flash in loop sub-templates — Twig
  has isolated variable scopes and cannot access PHP globals directly

- Fix pagination URLs: use get_pagenum_link() instead of ?page= query
  param (WordPress uses 'paged' for archive pagination, not 'page')

- Fix double-escaped – in result count by adding |raw filter

- Reset WooCommerce float-based layout CSS (woocommerce-layout.css) for
  shop pages to prevent conflicts with Bootstrap flex grid

- Register shop-sidebar widget area with Bootstrap-styled markup

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

inc/TemplateOverride.php

@@ -78,8 +78,17 @@ class TemplateOverride {
         }
 
         try {
-            $twig = TwigService::getInstance();
-            echo $twig->render( $twigTemplate, $args );
+            $twig    = TwigService::getInstance();
+            $context = $args;
+
+            // Inject the global $product into the Twig context.
+            // WooCommerce PHP templates access it via `global $product;` but Twig
+            // templates have isolated variable scopes and need it passed explicitly.
+            if ( ! isset( $context['product'] ) && ! empty( $GLOBALS['product'] ) ) {
+                $context['product'] = $GLOBALS['product'];
+            }
+
+            echo $twig->render( $twigTemplate, $context );
 
             // Buffer the upcoming PHP include so we can discard it.
             ob_start();