fix: Remove theme header and footer in Full SPA mode

Problem: Duplicate headers and footers showing (theme + SPA)
Root Cause: Theme's header and footer still rendering when Full SPA mode is active

Solution: Remove theme header/footer elements when on WooCommerce pages in Full SPA mode
- Hook into get_header and get_footer actions
- Remove all theme header/footer actions
- Keep only essential WordPress head/footer scripts
- Only applies when mode='full' and on WooCommerce pages

Changes:
- Added remove_theme_header() method
- Added remove_theme_footer() method
- Added should_remove_theme_elements() check
- Hooks into get_header and get_footer

Result:
✅ Clean SPA experience without theme header/footer
✅ Essential WordPress scripts still load
✅ Only affects Full SPA mode on WooCommerce pages
✅ Other pages keep theme header/footer

includes/Frontend/TemplateOverride.php

@@ -32,6 +32,10 @@ class TemplateOverride {
         
         // Override single product template
         add_filter('woocommerce_locate_template', [__CLASS__, 'override_template'], 10, 3);
+        
+        // Remove theme header and footer when SPA is active
+        add_action('get_header', [__CLASS__, 'remove_theme_header']);
+        add_action('get_footer', [__CLASS__, 'remove_theme_footer']);
     }
     
     /**
@@ -217,6 +221,52 @@ class TemplateOverride {
         return false;
     }
     
+    /**
+     * Remove theme header when SPA is active
+     */
+    public static function remove_theme_header() {
+        if (self::should_remove_theme_elements()) {
+            remove_all_actions('wp_head');
+            // Re-add essential WordPress head actions
+            add_action('wp_head', 'wp_enqueue_scripts', 1);
+            add_action('wp_head', 'wp_print_styles', 8);
+            add_action('wp_head', 'wp_print_head_scripts', 9);
+            add_action('wp_head', 'wp_resource_hints', 2);
+            add_action('wp_head', 'wp_site_icon', 99);
+        }
+    }
+    
+    /**
+     * Remove theme footer when SPA is active
+     */
+    public static function remove_theme_footer() {
+        if (self::should_remove_theme_elements()) {
+            remove_all_actions('wp_footer');
+            // Re-add essential WordPress footer actions
+            add_action('wp_footer', 'wp_print_footer_scripts', 20);
+        }
+    }
+    
+    /**
+     * Check if we should remove theme header/footer
+     */
+    private static function should_remove_theme_elements() {
+        $settings = get_option('woonoow_customer_spa_settings', []);
+        $mode = isset($settings['mode']) ? $settings['mode'] : 'disabled';
+        
+        // Only remove in full mode
+        if ($mode !== 'full') {
+            return false;
+        }
+        
+        // Check if we're on a WooCommerce page
+        if (is_shop() || is_product() || is_cart() || is_checkout() || is_account_page() || is_woocommerce()) {
+            return true;
+        }
+        
+        return false;
+    }
+    
     /**
      * Override WooCommerce templates
      */