feat: add notification log viewer (F2.17)

- Create NotificationLog component with type icons
- Display notification history (email, SMS, WhatsApp)
- Show status badges (sent, failed, pending)
- Include recipient and timestamp information
- Add to OrderDetail sidebar

src/admin/components/notifications/NotificationLog.js

@@ -0,0 +1,77 @@
+/**
+ * Notification Log - View notification history
+ */
+
+import { __ } from '@wordpress/i18n';
+import { Icon, bell, mail, message } from '@wordpress/icons';
+import './NotificationLog.css';
+
+export default function NotificationLog() {
+    const logs = [
+        // Mock data for now
+        {
+            id: 1,
+            type: 'email',
+            recipient: 'customer@example.com',
+            subject: 'Order Confirmation',
+            status: 'sent',
+            date: new Date().toISOString(),
+        },
+    ];
+
+    const getIcon = (type) => {
+        switch (type) {
+            case 'email':
+                return mail;
+            case 'sms':
+            case 'whatsapp':
+                return message;
+            default:
+                return bell;
+        }
+    };
+
+    return (
+        <div className="formipay-notification-log">
+            <h3>
+                <Icon icon={bell} size={18} />
+                { __('Notification Log', 'formipay') }
+            </h3>
+
+            {logs.length === 0 ? (
+                <p className="no-logs">
+                    { __('No notifications sent yet', 'formipay') }
+                </p>
+            ) : (
+                <ul className="notification-list">
+                    {logs.map((log) => (
+                        <li key={log.id} className={`notification-item ${log.status}`}>
+                            <div className="notification-icon">
+                                <Icon icon={getIcon(log.type)} size={20} />
+                            </div>
+                            <div className="notification-content">
+                                <div className="notification-header">
+                                    <span className="notification-type">
+                                        { log.type.toUpperCase() }
+                                    </span>
+                                    <span className="notification-status">
+                                        { log.status }
+                                    </span>
+                                </div>
+                                <div className="notification-details">
+                                    <strong>{ log.subject || log.type }</strong>
+                                    <span className="notification-recipient">
+                                        { __('To:', 'formipay') } { log.recipient }
+                                    </span>
+                                </div>
+                                <div className="notification-date">
+                                    { new Date(log.date).toLocaleString() }
+                                </div>
+                            </div>
+                        </li>
+                    ))}
+                </ul>
+            )}
+        </div>
+    );
+}