Harden sync and security; add IQ Bible, templates, password reset, backups

Sync and data safety
- Autosave flushes on leaving a study or the tab; storage-full errors are reported
- Unsynced studies, deletes and ink are queued and retried when back online
- Deletes propagate across devices (with a "Keep it" undo) and no longer resurrect
- Server assigns study versions (no client-clock conflicts); "Combine both"
  merges a conflicted study chunk by chunk
- Reading-plan progress made offline is merged, not overwritten; plans, ink and
  marks are cleared from the device on sign-out

Security
- Block SSRF through the ntfy reminder URL; failure-only rate limiting per IP and
  account; constant-time login; TOTP replay protection; input validation;
  SESSION_SECRET required in production; admin user delete fixed
- Forgot password: one-time code sent to the account's ntfy topic

Features
- IQ Bible proxy (route allow-list, text-only caching per its terms): more
  commentaries, lexicons, study aids, daily verse and devotional, plan calendar
  export, narrations, podcast background
- Study templates, reading-plan catch-up, account export, daily database snapshots

Tests and tooling
- ESLint config; App tests split into src/test; tests for sync queues, library
  hook, merge, templates, IQ Bible UI and reset form

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

server/accountExport.js

@@ -0,0 +1,32 @@
+// Everything one account holds on the server, in the same file format the app's own "Download backup"
+// makes, so it can be restored from Settings on any device.
+export const BACKUP_APP = 'bible-study-project';
+export const BACKUP_VERSION = 1;
+
+// `store` supplies the account's data: { projects(), prefs(), marks(), ink(), plans() }.
+export function buildAccountExport(user, store, now = new Date()) {
+  const prefs = store.prefs() ?? {};
+  const marks = store.marks() ?? {};
+  const plans = store.plans() ?? {};
+  return {
+    app: BACKUP_APP,
+    version: BACKUP_VERSION,
+    exportedAt: now.toISOString(),
+    account: user.email,
+    source: 'server',
+    projects: store.projects(),
+    reader: {
+      bookmarks: marks.bookmarks ?? {},
+      highlights: marks.highlights ?? [],
+      colorLabels: prefs.colorLabels?.v ?? {},
+      ink: store.ink() ?? {},
+    },
+    readingPlans: {
+      progress: plans.progress ?? [],
+      customPlans: plans.customPlans ?? [],
+      activity: plans.activity ?? [],
+    },
+  };
+}
+
+export const accountExportName = (now = new Date()) => `bible-study-account-${now.toISOString().slice(0, 10)}.json`;