console: add always-visible back-to-top button + collapsible dashboard panels (per-section, persisted)

portal/templates/base.html

@@ -33,6 +33,7 @@
   <main>
   {% block content %}{% endblock %}
   </main>
+  <button type="button" id="backToTop" class="back-to-top" aria-label="Back to top" title="Back to top">↑</button>
   <script>
     (function () {
       var root = document.documentElement;
@@ -53,5 +54,15 @@
       sync();
     })();
   </script>
+  <script>
+    (function () {
+      var btn = document.getElementById('backToTop');
+      if (!btn) return;
+      btn.addEventListener('click', function () {
+        (window.scrollTo || function(){ document.documentElement.scrollTop = 0; document.body.scrollTop = 0; })
+          .call(window, { top: 0, behavior: 'smooth' });
+      });
+    })();
+  </script>
 </body>
 </html>