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>

src/syncService.js

@@ -65,6 +65,20 @@ export async function deleteRemoteProject(id) {
   return request('DELETE', `/projects/${id}`);
 }
 
+// ---------------------------------------------------------------------------
+// Reading plan progress
+// ---------------------------------------------------------------------------
+
+/** Returns the signed-in user's whole reading-plan progress list. */
+export async function getRemoteReadingProgress() {
+  return request('GET', '/reading-plans');
+}
+
+/** Overwrites the signed-in user's whole reading-plan progress list. */
+export async function saveRemoteReadingProgress(progress) {
+  return request('PUT', '/reading-plans', progress);
+}
+
 // ---------------------------------------------------------------------------
 // Read-only share links
 // ---------------------------------------------------------------------------