Add cross-reference map, admin health page, passkeys and device list, settings tabs

- Reader: chapter cross-reference map (M) from IQ Bible's reference graph
- Admin: Health tab with disk use, snapshots (back up, download, restore), failure logs
- Passkey sign-in (WebAuthn), signed-in device list, sign out others, optional sign-in alerts
- Settings split into Account, Preferences, Notifications, Security, Your data tabs
- ntfy server field: catch a topic typed into the server box

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

src/components/CommandPalette.jsx

@@ -12,7 +12,7 @@ import { loadProjectById } from '../utils/projectStorage.js';
 export default function CommandPalette({ onClose }) {
   const {
     readerTheme, authUser, authServerDown, projectIndex, readerBookmarks, readerTextHighlights, readerColorLabels,
-    jumpToReaderVerse, setCurrentPage, setProject, resumeProject, openNewProject, goStudies, openReadingPlans,
+    jumpToReaderVerse, setCurrentPage, setProject, resumeProject, openNewProject, goStudies, openReadingPlans, openPrayer,
     openBibleReader, requestReaderSearch, openBackup,
   } = useApp();
   const [query, setQuery] = useState('');
@@ -40,7 +40,7 @@ export default function CommandPalette({ onClose }) {
     // 2. Pages and actions
     const pages = [
       ['Studies', 'My Studies', goStudies], ['Read Bible', 'The Bible reader', openBibleReader], ['Reading Plans', 'Plans and today’s reading', openReadingPlans],
-      ['New project', 'Start a Bible study', openNewProject], ['Settings', 'Account and preferences', () => setCurrentPage('settings')],
+      ['Prayer journal', 'Requests, answers and the verses behind them', openPrayer], ['New project', 'Start a Bible study', openNewProject], ['Settings', 'Account and preferences', () => setCurrentPage('settings')],
       ['Back up my data', 'Download everything as a file', openBackup],
     ];
     const lower = q.toLowerCase();