refactor(web): unify settings panel layouts with shared toolbar/body

- Add PanelToolbar/PanelBody primitives so all four settings tabs share
  the same top-toolbar + scrollable-body rhythm under the unified header.
- API panel: drop the heavy gray shadowed TabsList; move the create
  action into the toolbar next to the tabs, lighten per-tab hints.
- Storage panel: reuse PanelToolbar for the generated-at/refresh bar.
- Account panel: wrap content in PanelBody for consistent padding.
- Models panel: keep the pinned LangBot Models (Space) card at the very
  top, above the add-custom-provider row (intentional pin), using
  PanelBody instead of a top toolbar.

web/src/app/wizard/page.tsx

@@ -86,7 +86,7 @@ export default function WizardPage() {
   const [selectedAdapter, setSelectedAdapter] = useState<string | null>(null);
   const [selectedRunner, setSelectedRunner] = useState<string | null>(null);
   const [botName, setBotName] = useState('');
-  // eslint-disable-next-line @typescript-eslint/no-unused-vars
+
   const [botDescription, _setBotDescription] = useState('');
   const [adapterConfig, setAdapterConfig] = useState<Record<string, unknown>>(
     {},