Drop the logo and title from the top bar

The bar now holds only Lists, Settings and Sign out, right-aligned, and
is shown only when signed in, so visitors never see it on any page.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

web/static/css/app.css

@@ -50,12 +50,7 @@ code { font: 0.9em ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; bac
   -webkit-backdrop-filter: saturate(160%) blur(14px);
   border-bottom: 1px solid color-mix(in srgb, var(--border) 60%, transparent);
 }
-.topbar-inner { display: flex; align-items: center; justify-content: space-between; height: 60px; gap: 16px; }
-.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; font-weight: 650; min-width: 0; }
-.brand-name { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
-.brand-avatar { width: 30px; height: 30px; border-radius: 50%; object-fit: cover; }
-.brand-mark { display: grid; place-items: center; width: 30px; height: 30px; border-radius: 8px; background: var(--accent-soft); color: var(--accent); }
-.brand-mark .icon { width: 18px; height: 18px; }
+.topbar-inner { display: flex; align-items: center; justify-content: flex-end; height: 60px; gap: 16px; }
 .topnav { display: flex; align-items: center; gap: 4px; }
 .topnav a, .topnav-btn {
   display: inline-flex; align-items: center; gap: 7px;