Speed up client home by loading shelves in parallel.

Shelf item queries no longer run one-by-one; favorites load alongside them. Response shape and shelf order stay the same.

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/master-api/src/viewer/service.ts

@@ -692,8 +692,19 @@ export class ViewerService {
       });
     }
 
-    for (const shelf of ordered) {
+    // Plank-items parallel laden (volgorde van `ordered` blijft behouden via Promise.all-index).
+    // Favorites hangt niet van planken af → tegelijk ophalen i.p.v. erna.
+    const [shelfPayloads, favorites] = await Promise.all([
+      Promise.all(
+        ordered.map(async (shelf) => {
           const items = await this.shelfItems(shelf.id, shelf.kind, 48, kidsMode);
+          return { shelf, items };
+        })
+      ),
+      this.listFavorites(profileId, kidsMode),
+    ]);
+
+    for (const { shelf, items } of shelfPayloads) {
       if (items.length) {
         const homepageLabel = shelf.homepageName?.trim();
         rows.push({
@@ -711,7 +722,7 @@ export class ViewerService {
       continueWatching: continueItems,
       spotlight,
       shelves: rows,
-      favorites: await this.listFavorites(profileId, kidsMode),
+      favorites,
     };
   }