chore: complete M1.1 runtime QA and release packaging

shop/xshop-theme/inc/helpers/sanitize.php

@@ -0,0 +1,21 @@
+<?php
+declare(strict_types=1);
+defined('ABSPATH') || exit;
+
+/**
+ * Shared sanitization helpers. All options/banners/QA go through these.
+ */
+
+function xshop_sanitize_url(?string $value): string {
+    $value = trim((string) $value);
+    return $value === '' ? '' : esc_url_raw($value);
+}
+
+function xshop_sanitize_banner_position(string $value): string {
+    $allowed = ['home_hero','home_strip','shop_top','product_sidebar','footer_top'];
+    return in_array($value, $allowed, true) ? $value : 'home_hero';
+}
+
+function xshop_sanitize_checkbox($value): string {
+    return $value ? '1' : '0';
+}