feat: add settings and access dashboard slice

apps/dashboard/src/features/settings/settings-route.tsx

@@ -0,0 +1,19 @@
+import { useSearchParams } from 'react-router-dom';
+import { SettingsPage, type SettingsSection } from './settings-page.js';
+
+const validSections: readonly SettingsSection[] = ['monitoring', 'rate-limits', 'behaviour', 'access'];
+
+function parseSection(value: string | null): SettingsSection {
+  return validSections.find((section) => section === value) ?? 'monitoring';
+}
+
+export function SettingsRoute() {
+  const [searchParams, setSearchParams] = useSearchParams();
+  const section = parseSection(searchParams.get('section'));
+
+  function selectSection(nextSection: SettingsSection) {
+    setSearchParams({ section: nextSection }, { replace: true });
+  }
+
+  return <SettingsPage onSectionChange={selectSection} section={section} />;
+}