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>

server/iqbible.js

@@ -31,7 +31,7 @@ export const ROUTES = [
   route('/genealogies/@'), route('/bible-characters/@'), route('/bible-people/@'), route('/bible-people/@/@'),
   route('/harmony'), route('/harmony/@'), route('/textual-variants/@/@'), route('/textual-variants/@/@/@'),
   route('/chronology/for/@/@'), route('/reference/weights-measures'),
-  route('/cross-references/@/@'), route('/cross-references/@/@/@'),
+  route('/cross-references/graph'), route('/cross-references/@/@'), route('/cross-references/@/@/@'),
   route('/dictionaries'), route('/dictionaries/@'),
   route('/devotionals/today'), route('/devotionals/@/@'),
   route('/bibles'), route('/bibles/languages'), route('/bibles/parallel'), route('/bibles/@'), route('/bibles/@/@'), route('/bibles/@/verse-of-the-day'), route('/bibles/@/reading-plan'),