FRE-681: Register mail draft command in root

Add mailDraftCmd() to root command to enable draft operations (save, list, edit, send)

cmd/root.go

@@ -20,6 +20,8 @@ func NewRootCmd() *cobra.Command {
 	rootCmd.AddCommand(loginCmd())
 	rootCmd.AddCommand(logoutCmd())
 	rootCmd.AddCommand(sessionCmd())
+	rootCmd.AddCommand(mailCmd())
+	rootCmd.AddCommand(mailDraftCmd())
 	rootCmd.AddCommand(contactCmd())
 	rootCmd.AddCommand(attachmentCmd())