feat: Add toggle functionality to Shipping methods

Implemented inline enable/disable for shipping methods.

Frontend Changes:
✅ Allow HTML in shipping method names and prices
✅ Add toggle switches to each shipping method
✅ Loading state while toggling
✅ Toast notifications for success/error
✅ Optimistic UI updates via React Query

Backend Changes:
✅ POST /settings/shipping/zones/{zone_id}/methods/{instance_id}/toggle
✅ Enable/disable shipping methods
✅ Clear WooCommerce shipping cache
✅ Proper error handling

User Experience:
- Quick enable/disable without leaving page
- Similar to Payments page pattern
- Complex configuration still in WooCommerce
- Edit zone button for detailed settings
- Add zone button for new zones

Result:
✅ Functional shipping management
✅ No need to redirect for simple toggles
✅ Maintains WooCommerce compatibility
✅ Clean, intuitive interface

includes/Api/ShippingController.php

@@ -32,6 +32,33 @@ class ShippingController extends WP_REST_Controller {
 				),
 			)
 		);
+
+		// Toggle shipping method
+		register_rest_route(
+			$this->namespace,
+			'/' . $this->rest_base . '/zones/(?P<zone_id>\d+)/methods/(?P<instance_id>\d+)/toggle',
+			array(
+				array(
+					'methods'             => \WP_REST_Server::CREATABLE,
+					'callback'            => array( $this, 'toggle_method' ),
+					'permission_callback' => array( $this, 'check_permission' ),
+					'args'                => array(
+						'zone_id'     => array(
+							'required' => true,
+							'type'     => 'integer',
+						),
+						'instance_id' => array(
+							'required' => true,
+							'type'     => 'integer',
+						),
+						'enabled'     => array(
+							'required' => true,
+							'type'     => 'boolean',
+						),
+					),
+				),
+			)
+		);
 	}
 
 	/**
@@ -153,6 +180,77 @@ class ShippingController extends WP_REST_Controller {
 		}
 	}
 
+	/**
+	 * Toggle shipping method enabled/disabled
+	 */
+	public function toggle_method( WP_REST_Request $request ) {
+		try {
+			$zone_id     = $request->get_param( 'zone_id' );
+			$instance_id = $request->get_param( 'instance_id' );
+			$enabled     = $request->get_param( 'enabled' );
+
+			// Get the zone
+			$zone = \WC_Shipping_Zones::get_zone( $zone_id );
+			if ( ! $zone ) {
+				return new WP_REST_Response(
+					array(
+						'error'   => 'zone_not_found',
+						'message' => __( 'Shipping zone not found', 'woonoow' ),
+					),
+					404
+				);
+			}
+
+			// Get all shipping methods for this zone
+			$shipping_methods = $zone->get_shipping_methods();
+			$method_found     = false;
+
+			foreach ( $shipping_methods as $method ) {
+				if ( $method->instance_id == $instance_id ) {
+					$method_found = true;
+					
+					// Update the enabled status
+					$method->enabled = $enabled ? 'yes' : 'no';
+					update_option( $method->get_instance_option_key(), $method->instance_settings );
+					
+					break;
+				}
+			}
+
+			if ( ! $method_found ) {
+				return new WP_REST_Response(
+					array(
+						'error'   => 'method_not_found',
+						'message' => __( 'Shipping method not found', 'woonoow' ),
+					),
+					404
+				);
+			}
+
+			// Clear shipping cache
+			\WC_Cache_Helper::get_transient_version( 'shipping', true );
+
+			return new WP_REST_Response(
+				array(
+					'success' => true,
+					'message' => $enabled 
+						? __( 'Shipping method enabled', 'woonoow' )
+						: __( 'Shipping method disabled', 'woonoow' ),
+				),
+				200
+			);
+
+		} catch ( \Exception $e ) {
+			return new WP_REST_Response(
+				array(
+					'error'   => 'toggle_failed',
+					'message' => $e->getMessage(),
+				),
+				500
+			);
+		}
+	}
+
 	/**
 	 * Check if user has permission to manage shipping
 	 */