web add table fix in naming

web/templates/pages/add_table/builder.html

@@ -338,7 +338,9 @@
 #}
 {% if !page.alias_rows().is_empty() %}
 <section class="builder-section">
-  <details class="rename-generated">
+  {# Open once a name has been asked for: the section is where those names are
+     read back, and a swap that closed it would hide what was just applied. #}
+  <details class="rename-generated" {% if page.draft.has_generated_aliases() %}open{% endif %}>
     <summary>Rename generated columns</summary>
     <p class="hint">These columns come from the definition rows above. Give one a name of your own, or leave it empty to keep the name shown.</p>
     <ul class="rename-list">
@@ -352,6 +354,14 @@
         </li>
       {% endfor %}
     </ul>
+    {#
+      A text field posts nothing on its own here, so the names typed above are
+      only carried by the next request. This button is that request: it applies
+      them, so the column list and the preview show the renamed columns.
+    #}
+    <button type="button" class="secondary" hx-post="/admin/tables/builder" hx-include="#table-form"
+            hx-target="#builder" hx-swap="innerHTML"
+            hx-vals='{"action": "apply-generated-names"}'>Apply names</button>
   </details>
 </section>
 {% endif %}