feat(client): set dynamic page title based on content

- add usePageTitle hook that writes '<title> | Liqa' to document.title
- list pages use section name; detail pages use entity name once loaded
- create/edit pages use static action title, edit includes entity name

client/src/pages/scenario/ScenarioDetailPage.tsx

@@ -1,6 +1,7 @@
 import { useEffect, useRef, useState, SubmitEvent } from 'react';
 import { useNavigate, useParams } from 'react-router-dom';
 import { useTranslation } from 'react-i18next';
+import { usePageTitle } from '../../hooks/usePageTitle';
 import {
   Play,
   Pencil,
@@ -51,6 +52,7 @@ export function ScenarioDetailPage() {
   const toast = useToast();
   const [scenario, setScenario] = useState<(Scenario & { steps: ScenarioStep[] }) | null>(null);
   const [loading, setLoading] = useState(true);
+  usePageTitle(scenario?.name ?? null);
 
   // Credentials state
   const [scenarioCreds, setScenarioCreds] = useState<ScenarioCredential[]>([]);