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/credential/CredentialDetailPage.tsx

@@ -1,6 +1,7 @@
 import { useEffect, useState } from 'react';
 import { useNavigate, useParams } from 'react-router-dom';
 import { useTranslation } from 'react-i18next';
+import { usePageTitle } from '../../hooks/usePageTitle';
 import { Upload, Pencil, Trash2, KeyRound } from 'lucide-react';
 import { CodeBlock } from '../../ui';
 import { stringify as yamlStringify } from 'yaml';
@@ -16,6 +17,7 @@ export function CredentialDetailPage() {
   const navigate = useNavigate();
   const [credential, setCredential] = useState<Credential | null>(null);
   const [loading, setLoading] = useState(true);
+  usePageTitle(credential?.name ?? null);
   const [confirmDeleteOpen, setConfirmDeleteOpen] = useState(false);
   const [deleting, setDeleting] = useState(false);