fix: Address issues with all 4 features

1. Admin Store Link - Add to WP admin bar (Menu.php) with proper option check
2. Activity Log - Fix Loading text to show correct state after data loads
3. Avatar Upload - Use correct option key woonoow_allow_custom_avatar
4. Downloadable Files - Connect to WooCommerce native:
   - Add downloads array to format_product_full
   - Add downloads/download_limit/download_expiry handling in update_product
   - Add downloads handling in create_product

includes/Admin/Menu.php

@@ -111,6 +111,21 @@ class Menu {
                 'title' => __( 'WooNooW Standalone Admin', 'woonoow' ),
             ],
         ] );
+
+        // Add Store link if customer SPA is not disabled
+        $customer_spa_enabled = get_option( 'woonoow_customer_spa_enabled', true );
+        if ( $customer_spa_enabled ) {
+            $store_url = home_url( '/store/' );
+            $wp_admin_bar->add_node( [
+                'id'     => 'woonoow-store',
+                'title'  => '<span class="ab-icon dashicons-cart"></span><span class="ab-label">' . __( 'Store', 'woonoow' ) . '</span>',
+                'href'   => $store_url,
+                'meta'   => [
+                    'title'  => __( 'View Customer Store', 'woonoow' ),
+                    'target' => '_blank',
+                ],
+            ] );
+        }
     }
 
 }