Add reading plans: catalog, progress tracking, and custom plans

Replaces the old single-book reading goal with a full Reading Plans page:
9 built-in plans (Whole Bible, OT/NT, topical) with cover photos and
color-themed cards, day-by-day checklists synced to the server per user,
inline "mark today read" in the Bible reader, and user-created plans with
their own book picker and an optional uploaded cover photo.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

server/index.js

@@ -13,6 +13,7 @@ import {
   adminGetAllUsers, adminDeleteUser, adminGetAllProjects, adminGetProject, adminDeleteProject,
   setUserPassword, destroyAllSessionsForUser,
   getAllReaderInk, setReaderInkPage,
+  getReadingProgress, setReadingProgress,
 } from './db.js';
 import { SqliteSessionStore } from './sessionStore.js';
 import {
@@ -394,6 +395,35 @@ app.put('/api/reader/ink/:book/:chapter', requireAuth, (req, res) => {
   }
 });
 
+// ---------------------------------------------------------------------------
+// Reading plan progress — cross-device sync for started/completed reading plans
+// ---------------------------------------------------------------------------
+
+// GET /api/reading-plans — the current user's whole progress list
+app.get('/api/reading-plans', requireAuth, (req, res) => {
+  try {
+    res.json(getReadingProgress(req.session.userId));
+  } catch (err) {
+    console.error('GET /api/reading-plans error:', err);
+    res.status(500).json({ error: 'Failed to load reading plan progress.' });
+  }
+});
+
+// PUT /api/reading-plans — overwrite the current user's whole progress list
+// (an object: { progress: [...], customPlans: [...] })
+app.put('/api/reading-plans', requireAuth, (req, res) => {
+  try {
+    if (!req.body || typeof req.body !== 'object' || Array.isArray(req.body)) {
+      return res.status(400).json({ error: 'Body must be an object.' });
+    }
+    setReadingProgress(req.session.userId, req.body);
+    res.json({ ok: true });
+  } catch (err) {
+    console.error('PUT /api/reading-plans error:', err);
+    res.status(500).json({ error: 'Failed to save reading plan progress.' });
+  }
+});
+
 // ---------------------------------------------------------------------------
 // Read-only share links
 // ---------------------------------------------------------------------------