feat: add the booking board with floor plan and calendar

templates/_partials/_flashes.html.twig

@@ -1,13 +1,12 @@
-{# Flat inline alerts for now. myep renders these as Toastify toasts, but that means adopting
-   toastify-js as a dependency -- deferred until the toast/OOB work (plan step 7). #}
-{% set levels = { error: 'bg-red-600', warning: 'bg-red-600', success: 'bg-emerald-600', info: 'bg-primary' } %}
+{# Just the alerts. The positioned container with id="flashes" lives in layout.html.twig, because
+   that is the element htmx swaps out of band after a booking. Flat inline alerts for now: myep
+   renders these as Toastify toasts, which would mean adopting toastify-js (plan step 2/7). #}
+{% set levels = { error: 'bg-red-600', warning: 'bg-amber-600', success: 'bg-emerald-600', info: 'bg-primary' } %}
 
 {% for level, messages in app.flashes(levels|keys) %}
-    <div class="fixed bottom-4 right-4 z-50 space-y-2">
-        {% for message in messages %}
-            <div class="{{ levels[level] }} text-gray-100 rounded shadow-lg px-4 py-3 text-sm">
-                {{ message|trans }}
-            </div>
-        {% endfor %}
-    </div>
+    {% for message in messages %}
+        <div class="{{ levels[level] }} text-white rounded shadow-lg px-4 py-3 text-sm">
+            {{ message|trans }}
+        </div>
+    {% endfor %}
 {% endfor %}