multiple-connection-handling (#3)

Reviewed-on: #3

Provider/frontend/src/App.svelte

@@ -4,6 +4,7 @@
   import Sidebar from "./lib/Sidebar.svelte";
   import TaskManager from "./lib/TaskManager.svelte";
   import UserManager from "./lib/UserManager.svelte";
+  import Spinner from "./lib/Spinner.svelte";
 
   /** @type {'loading' | 'ok' | 'error' | 'rebooting'} */
   let status = $state("loading");
@@ -389,6 +390,8 @@
   </main>
 </div>
 
+<Spinner />
+
 <style>
   .app-layout {
     display: flex;