feat: enhance Gmail draft update functionality

- Improved the update_gmail_draft tool to allow users to review and edit draft content before applying changes.
- Added logic to generate draft body content based on user requests and conversation context.
- Implemented fetching of existing draft body to facilitate user edits in the approval card.
- Updated UI components to support displaying and editing existing draft content, enhancing user experience.

surfsense_web/app/dashboard/[search_space_id]/new-chat/[[...chat_id]]/page.tsx

@@ -175,6 +175,7 @@ const TOOLS_WITH_UI = new Set([
 	"update_calendar_event",
 	"delete_calendar_event",
 	"create_gmail_draft",
+	"update_gmail_draft",
 	"send_gmail_email",
 	"trash_gmail_email",
 	"execute",