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/db.js

@@ -81,6 +81,16 @@ export function initDb() {
     );
   `);
 
+  // Reading plan progress — one row per user, holding the whole list of
+  // in-progress/completed plans as JSON (small; no need to normalize).
+  db.exec(`
+    CREATE TABLE IF NOT EXISTS reading_progress (
+      user_id    TEXT PRIMARY KEY REFERENCES users(id) ON DELETE CASCADE,
+      data       TEXT NOT NULL,
+      updated_at INTEGER NOT NULL
+    );
+  `);
+
   console.log(`SQLite database ready at ${DB_PATH}`);
 }
 
@@ -182,6 +192,30 @@ export function setReaderInkPage(userId, bookAbbrev, chapter, strokes) {
   `).run(userId, bookAbbrev, Number(chapter), JSON.stringify(strokes), Date.now());
 }
 
+// ---------------------------------------------------------------------------
+// Reading plan progress — cross-device sync for started/completed reading plans
+// ---------------------------------------------------------------------------
+
+/** Returns the user's reading-plan data ({ progress, customPlans }, parsed JSON), or an empty shell. */
+export function getReadingProgress(userId) {
+  const row = db.prepare('SELECT data FROM reading_progress WHERE user_id = ?').get(userId);
+  if (!row) return { progress: [], customPlans: [] };
+  try {
+    return JSON.parse(row.data);
+  } catch {
+    return { progress: [], customPlans: [] };
+  }
+}
+
+/** Overwrites the user's whole reading-plan progress list. */
+export function setReadingProgress(userId, progress) {
+  db.prepare(`
+    INSERT INTO reading_progress (user_id, data, updated_at)
+    VALUES (?, ?, ?)
+    ON CONFLICT(user_id) DO UPDATE SET data = excluded.data, updated_at = excluded.updated_at
+  `).run(userId, JSON.stringify(progress), Date.now());
+}
+
 /**
  * Assigns any pre-existing, unowned projects (from before multi-user support)
  * to the given user. Intended to run once, right after the first account is created.