feat: Add all WooCommerce order status events

Added missing order status events that were not showing in admin UI.

New Events Added (Staff + Customer):
- Order On-Hold (awaiting payment)
- Order Failed (payment/processing failed)
- Order Refunded (full refund processed)
- Order Pending (initial order state)

Changes:
1. EventRegistry.php - Added 8 new event definitions
2. DefaultTemplates.php - Added 8 new email templates
3. DefaultTemplates.php - Added subject lines for all new events

Now Available in Admin:
- Staff: 11 order events total
- Customer: 12 events total (including new customer)

All events can be toggled on/off per channel (email/push) in admin UI.

includes/Email/DefaultTemplates.php

@@ -37,6 +37,10 @@ class DefaultTemplates {
 				'order_shipped' => self::customer_order_shipped(),
 				'order_completed' => self::customer_order_completed(),
 				'order_cancelled' => self::customer_order_cancelled(),
+				'order_on_hold' => self::customer_order_on_hold(),
+				'order_failed' => self::customer_order_failed(),
+				'order_refunded' => self::customer_order_refunded(),
+				'order_pending' => self::customer_order_pending(),
 				'payment_received' => self::customer_payment_received(),
 				'payment_failed' => self::customer_payment_failed(),
 				'new_customer' => self::customer_new_customer(),
@@ -47,6 +51,10 @@ class DefaultTemplates {
 				'order_shipped' => self::staff_order_shipped(),
 				'order_completed' => self::staff_order_completed(),
 				'order_cancelled' => self::staff_order_cancelled(),
+				'order_on_hold' => self::staff_order_on_hold(),
+				'order_failed' => self::staff_order_failed(),
+				'order_refunded' => self::staff_order_refunded(),
+				'order_pending' => self::staff_order_pending(),
 				'payment_received' => self::staff_payment_received(),
 				'payment_failed' => self::staff_payment_failed(),
 			],
@@ -77,6 +85,10 @@ class DefaultTemplates {
 				'order_shipped' => 'Your order #{order_number} is on its way',
 				'order_completed' => 'Your order #{order_number} has arrived',
 				'order_cancelled' => 'Your order #{order_number} has been cancelled',
+				'order_on_hold' => 'Your order #{order_number} is on hold',
+				'order_failed' => 'Your order #{order_number} has failed',
+				'order_refunded' => 'Your order #{order_number} has been refunded',
+				'order_pending' => 'Your order #{order_number} is pending',
 				'payment_received' => 'Payment confirmed for order #{order_number}',
 				'payment_failed' => 'Payment failed for order #{order_number}',
 				'new_customer' => 'Welcome to {site_name}!',
@@ -87,6 +99,10 @@ class DefaultTemplates {
 				'order_shipped' => '[Order Shipped] #{order_number}',
 				'order_completed' => '[Order Completed] #{order_number}',
 				'order_cancelled' => '[Order Cancelled] #{order_number}',
+				'order_on_hold' => '[Order On-Hold] #{order_number}',
+				'order_failed' => '[Order Failed] #{order_number}',
+				'order_refunded' => '[Order Refunded] #{order_number}',
+				'order_pending' => '[Order Pending] #{order_number}',
 				'payment_received' => '[Payment Received] #{order_number} - {order_total}',
 				'payment_failed' => '[Payment Failed] #{order_number}',
 			],
@@ -788,4 +804,227 @@ Order is reserved but will be cancelled automatically if payment is not received
 
 [/card]';
 	}
+
+	// ========================================================================
+	// ADDITIONAL ORDER STATUS TEMPLATES
+	// ========================================================================
+
+	/**
+	 * Customer: Order On-Hold
+	 */
+	private static function customer_order_on_hold() {
+		return '[card type="info"]
+
+## Your order is on hold
+
+Your order #{order_number} is awaiting payment confirmation.
+
+[/card]
+
+[card]
+
+**Order Number:** #{order_number}
+**Order Total:** {order_total}
+**Payment Method:** {payment_method}
+
+[/card]
+
+[button url="{payment_retry_url}"]Complete Payment[/button]
+
+[card]
+
+Questions? Contact us: {support_email}
+
+[/card]';
+	}
+
+	/**
+	 * Customer: Order Failed
+	 */
+	private static function customer_order_failed() {
+		return '[card type="warning"]
+
+## Order #{order_number} has failed
+
+Unfortunately, your order could not be processed.
+
+[/card]
+
+[card]
+
+**Order Number:** #{order_number}
+**Order Total:** {order_total}
+**Reason:** Payment could not be processed
+
+[/card]
+
+[button url="{shop_url}"]Continue Shopping[/button]
+
+[card]
+
+Need help? Contact: {support_email}
+
+[/card]';
+	}
+
+	/**
+	 * Customer: Order Refunded
+	 */
+	private static function customer_order_refunded() {
+		return '[card type="success"]
+
+## Your order #{order_number} has been refunded
+
+Your refund has been processed successfully.
+
+[/card]
+
+[card]
+
+**Order Number:** #{order_number}
+**Refund Amount:** {order_total}
+**Refund Date:** {order_date}
+
+[/card]
+
+[card type="info"]
+
+The refund will appear in your account within 5-10 business days depending on your payment provider.
+
+[/card]
+
+[card]
+
+Questions? Contact: {support_email}
+
+[/card]';
+	}
+
+	/**
+	 * Customer: Order Pending
+	 */
+	private static function customer_order_pending() {
+		return '[card type="info"]
+
+## Thank you for your order!
+
+Your order #{order_number} is pending and will be processed once payment is confirmed.
+
+[/card]
+
+[card]
+
+**Order Number:** #{order_number}
+**Order Total:** {order_total}
+**Payment Method:** {payment_method}
+
+[/card]
+
+[card]
+
+{order_items_table}
+
+[/card]
+
+[button url="{order_url}"]View Order[/button]
+
+[card]
+
+Questions? Contact: {support_email}
+
+[/card]';
+	}
+
+	/**
+	 * Staff: Order On-Hold
+	 */
+	private static function staff_order_on_hold() {
+		return '[card type="info"]
+
+## Order #{order_number} is on hold
+
+Awaiting payment confirmation from {customer_name}.
+
+[/card]
+
+[card]
+
+**Order Number:** #{order_number}
+**Customer:** {customer_name}
+**Order Total:** {order_total}
+**Payment Method:** {payment_method}
+
+[/card]
+
+[button url="{order_url}"]View Order[/button]';
+	}
+
+	/**
+	 * Staff: Order Failed
+	 */
+	private static function staff_order_failed() {
+		return '[card type="warning"]
+
+## Order #{order_number} has failed
+
+Order from {customer_name} could not be processed.
+
+[/card]
+
+[card]
+
+**Order Number:** #{order_number}
+**Customer:** {customer_name}
+**Order Total:** {order_total}
+
+[/card]
+
+[button url="{order_url}"]View Details[/button]';
+	}
+
+	/**
+	 * Staff: Order Refunded
+	 */
+	private static function staff_order_refunded() {
+		return '[card type="success"]
+
+## Order #{order_number} has been refunded
+
+Refund processed for {customer_name}.
+
+[/card]
+
+[card]
+
+**Order Number:** #{order_number}
+**Customer:** {customer_name}
+**Refund Amount:** {order_total}
+
+[/card]
+
+[button url="{order_url}"]View Order[/button]';
+	}
+
+	/**
+	 * Staff: Order Pending
+	 */
+	private static function staff_order_pending() {
+		return '[card type="info"]
+
+## New pending order #{order_number}
+
+Order from {customer_name} is pending payment.
+
+[/card]
+
+[card]
+
+**Order Number:** #{order_number}
+**Customer:** {customer_name}
+**Order Total:** {order_total}
+
+[/card]
+
+[button url="{order_url}"]View Order[/button]';
+	}
 }