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/environment/EnvironmentsPage.tsx

@@ -1,6 +1,7 @@
 import { useEffect, useRef, useState } from 'react';
 import { useNavigate } from 'react-router-dom';
 import { useTranslation } from 'react-i18next';
+import { usePageTitle } from '../../hooks/usePageTitle';
 import { Settings, ExternalLink, Pencil, Trash2, Plus, Globe, Download } from 'lucide-react';
 import { parse as yamlParse } from 'yaml';
 import { stringify as yamlStringify } from 'yaml';
@@ -117,6 +118,7 @@ function AddEnvironmentCard() {
 
 export function EnvironmentsPage() {
   const { t } = useTranslation();
+  usePageTitle(t('environments.title'));
   const navigate = useNavigate();
   const [items, setItems] = useState<Environment[]>([]);
   const [loading, setLoading] = useState(true);