feat: implement header/footer visibility controls for checkout and thankyou pages

- Created LayoutWrapper component to conditionally render header/footer based on route
- Created MinimalHeader component (logo only)
- Created MinimalFooter component (trust badges + policy links)
- Created usePageVisibility hook to get visibility settings per page
- Wrapped ClassicLayout with LayoutWrapper for conditional rendering
- Header/footer visibility now controlled directly in React SPA
- Settings: show/minimal/hide for both header and footer
- Background color support for checkout and thankyou pages

flush-nav-cache.php

@@ -0,0 +1,16 @@
+<?php
+/**
+ * Flush Navigation Cache
+ * 
+ * Run this file once to clear the navigation cache and force a rebuild.
+ * Access via: /wp-content/plugins/woonoow/flush-nav-cache.php
+ */
+
+// Load WordPress
+require_once __DIR__ . '/../../../wp-load.php';
+
+// Flush the navigation cache
+delete_option('wnw_nav_tree');
+
+echo "✅ Navigation cache cleared! Refresh your Admin SPA to see the changes.\n";
+echo "Version: 1.0.2 - Customer SPA moved to Appearance menu\n";