feat: add admin views, a booking horizon and confirmation modals

Co-Authored-By: Claude Opus 5 <[email protected]>

templates/board/index.html.twig

@@ -32,3 +32,14 @@
         </div>
     </div>
 {% endblock %}
+
+{#
+    Removes whatever modal is open, out of band. Only BookingController::boardResponse() renders
+    it, and only for a confirmation that was opened over another modal -- the confirmation swaps
+    itself away by targeting its own element, which leaves the one underneath behind.
+
+    Never rendered as part of the page: nothing in the layout calls this block.
+#}
+{% block modal_dismiss %}
+    <div id="htmx-modal" hx-swap-oob="delete"></div>
+{% endblock %}