chore: complete M1.1 runtime QA and release packaging

shop/xshop-theme/404.php

@@ -0,0 +1,39 @@
+<?php
+/**
+ * 404
+ *
+ * @package XShop
+ */
+
+declare(strict_types=1);
+
+defined('ABSPATH') || exit;
+
+get_header();
+?>
+<div class="xshop-container">
+  <div class="xshop-404">
+    <p class="xshop-404__code">404</p>
+    <h1 class="xshop-404__title"><?php esc_html_e('Page not found', 'xshop'); ?></h1>
+    <p class="xshop-text-muted" style="max-inline-size:48ch;margin-inline:auto"><?php esc_html_e('The page you are looking for does not exist. Try searching or return home.', 'xshop'); ?></p>
+    <div style="margin-block-start:var(--xshop-space-6);display:flex;gap:var(--xshop-space-3);justify-content:center;flex-wrap:wrap">
+      <a class="xshop-btn xshop-btn--primary" href="<?php echo esc_url(home_url('/')); ?>"><?php esc_html_e('Go home', 'xshop'); ?></a>
+    </div>
+    <div style="max-inline-size:520px;margin-inline:auto;margin-block-start:var(--xshop-space-8)">
+      <?php get_template_part('template-parts/components/search-form', null, ['placeholder'=>esc_html__('Search…','xshop')]); ?>
+    </div>
+
+    <?php
+      $recent = new WP_Query(['post_type'=>'post','posts_per_page'=>3,'no_found_rows'=>true]);
+      if ($recent->have_posts()):
+    ?>
+      <section class="xshop-section" aria-labelledby="xshop-404-recent">
+        <h2 id="xshop-404-recent" class="xshop-section__title" style="font-size:var(--xshop-text-xl)"><?php esc_html_e('Recent posts', 'xshop'); ?></h2>
+        <div class="xshop-grid xshop-grid--posts" style="margin-block-start:var(--xshop-space-4);text-align:start">
+          <?php while ($recent->have_posts()): $recent->the_post(); get_template_part('template-parts/components/post-card'); endwhile; wp_reset_postdata(); ?>
+        </div>
+      </section>
+    <?php endif; ?>
+  </div>
+</div>
+<?php get_footer(); ?>