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>

content-product.php

@@ -0,0 +1,33 @@
+<?php
+/**
+ * Product Content in Loop — PHP Bridge to Twig
+ *
+ * Bridge file that renders the Bootstrap 5 card template (content-product.html.twig)
+ * via the parent theme's TwigService instead of WooCommerce's default <li> markup.
+ *
+ * WooCommerce's wc_get_template_part('content', 'product') uses locate_template()
+ * which finds this file in the child theme before falling back to the plugin template.
+ * Unlike wc_get_template(), wc_get_template_part() does NOT fire the
+ * woocommerce_before_template_part / woocommerce_after_template_part hooks,
+ * so the TemplateOverride class cannot intercept it — this bridge file is needed.
+ *
+ * @package WcBootstrap
+ * @since 0.1.0
+ */
+
+defined( 'ABSPATH' ) || exit;
+
+global $product;
+
+// Ensure the product is valid and visible (same guard as WooCommerce's default template).
+if ( ! is_a( $product, WC_Product::class ) || ! $product->is_visible() ) {
+	return;
+}
+
+if ( class_exists( '\WPBootstrap\Twig\TwigService' ) ) {
+	$twig = \WPBootstrap\Twig\TwigService::getInstance();
+	echo $twig->render( 'content-product.html.twig', [] );
+} else {
+	// Fallback: include WooCommerce's default template directly.
+	include WC()->plugin_path() . '/templates/content-product.php';
+}