Refactor: Improve address formatting in CustomersController and enhance HTML rendering for billing and shipping addresses

app/views/customers/_details.html.erb

@@ -23,12 +23,12 @@
     
      <tr>
         <th><%=t(:label_billing_address)%></th>
-        <td><%= @billing_address %></td>
+        <td><pre><%= @billing_address %></pre></td>
     </tr>
     
      <tr>
         <th><%=t(:label_shipping_address)%></th>
-        <td><%= @shipping_address %></td>
+        <td><pre><%= @shipping_address %></pre></td>
     </tr>
     
     <tr>