web routing is POG now

web/templates/pages/admin/table_definition/columns.html

@@ -0,0 +1,23 @@
+{# GET /admin/tables/columns — crate::pages::admin::table_definition::ui::ColumnsPage #}
+{% extends "ui/base.html" %}
+
+{% block title %}Columns{% endblock %}
+
+{% block content %}
+<main>
+  {% include "pages/admin/table_definition/context.html" %}
+
+  {#
+    One swap target for the page's body. Both writes answer with this markup
+    re-read from the backend, so the screen after a change is the definition
+    as it now is, not the form that was submitted.
+  #}
+  <div id="table-panel" aria-live="polite">
+    {% include "pages/admin/table_definition/columns_panel.html" %}
+  </div>
+</main>
+
+<datalist id="currency-codes">
+  {% for code in currency_codes %}<option value="{{ code }}"></option>{% endfor %}
+</datalist>
+{% endblock %}