feat: on a phone the header's links scroll under a pinned profile button; the assistant's close is red

internal/server/web/static/app.css

@@ -231,6 +231,9 @@ input.sw:disabled { opacity: .45; cursor: not-allowed; }
   header.topbar nav { flex: 1 1 auto; min-width: 0; }
   header.topbar nav > :first-child { margin-left: auto !important; }
   header.topbar nav #status { flex: 0 1 auto; min-width: 0; max-width: 30vw; }
+  /* The links scroll; the profile button stays put at the right. */
+  header.topbar nav #acct { position: sticky; right: 0; z-index: 1; background: var(--panel);
+    box-shadow: -14px 0 12px -4px var(--panel); }
   .acct-add { flex-wrap: wrap; }
   .acct-add button { width: 100%; }
   .acct-keys li { flex-wrap: wrap; }