feat(n8n-webhook): add gmail draft list/delete/send approval flows

skills/n8n-webhook/scripts/validate-workflow.py

@@ -26,6 +26,10 @@ SAMPLE_FILES = [
     'test-notify.json',
     'test-send-notification-draft.json',
     'test-send-email-draft.json',
+    'test-list-email-drafts.json',
+    'test-delete-email-draft.json',
+    'test-send-gmail-draft.json',
+    'test-send-approved-email.json',
     'test-create-calendar-event.json',
     'test-fetch-and-normalize-url.json',
     'test-approval-queue-list.json',
@@ -38,6 +42,10 @@ ROUTER_SNIPPETS = [
     'notify',
     'send_notification_draft',
     'send_email_draft',
+    'list_email_drafts',
+    'delete_email_draft',
+    'send_gmail_draft',
+    'send_approved_email',
     'create_calendar_event',
     'approval_queue_add',
     'approval_queue_list',
@@ -50,6 +58,10 @@ ROUTER_SNIPPETS = [
     '$getWorkflowStaticData',
     'approvalQueue',
     'approvalHistory',
+    'email_draft_send',
+    'email_draft_delete',
+    'email_list_drafts',
+    'makeApprovalPolicy',
     'inboundEvents',
     'eventDedup',
     'notify_text',