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/reminders.js

@@ -6,6 +6,7 @@ import { lookup } from 'dns/promises';
 import { isIP } from 'net';
 import { getUsersWithRemindersEnabled, setLastReminderDate, getReadingProgress, getUsersWithVotdEnabled, setLastVotdDate, getUsersWithPrayerReminder, setLastPrayerDate, getPrayers } from './db.js';
 import { openPrayers } from './prayers.js';
+import { logEvent } from './health.js';
 import { fetchVerseOfDay, votdMessage } from './votd.js';
 
 // A reminder still goes out if the server was briefly down (or restarting) at the
@@ -119,6 +120,7 @@ export async function checkReminders(now = new Date()) {
       setLastReminderDate(user.id, zonedNow(now, user.reminderTz).date);
     } catch (err) {
       console.error(`Reading reminder failed for user ${user.id}:`, err.message);
+      logEvent('notify', `Reading reminder: ${err.message}`, { userId: user.id });
     }
   }
 }
@@ -139,6 +141,7 @@ export async function checkVotd(now = new Date()) {
       setLastVotdDate(user.id, zonedNow(now, user.reminderTz).date);
     } catch (err) {
       console.error(`Verse of the day failed for user ${user.id}:`, err.message);
+      logEvent('notify', `Verse of the day: ${err.message}`, { userId: user.id });
     }
   }
 }
@@ -169,6 +172,7 @@ export async function checkPrayerReminders(now = new Date()) {
       setLastPrayerDate(user.id, zonedNow(now, user.reminderTz).date);
     } catch (err) {
       console.error(`Prayer reminder failed for user ${user.id}:`, err.message);
+      logEvent('notify', `Prayer reminder: ${err.message}`, { userId: user.id });
     }
   }
 }