Align sidebar loading indicators and history heading

views/subscriptions.html

@@ -9,5 +9,12 @@
       gap: 2rem;
       padding: 1.5rem 0;
     "
-  ></div>
+  >
+    <div class="sidebar-loading-wrapper" role="status" aria-live="polite">
+      <div class="sidebar-loading-indicator">
+        <span class="status-spinner status-spinner--inline" aria-hidden="true"></span>
+        <span class="sidebar-loading-text">Fetching subscriptions…</span>
+      </div>
+    </div>
+  </div>
 </section>