fix: Restore fallbackShelves variable broken by PR 711

Author: devanshi14malhotra

frontend/js/app.js

@@ -3279,19 +3279,13 @@ document.addEventListener('DOMContentLoaded', async () => {
         renderer.renderCuratedSection(query, 'search-results-grid', 20);
     } else if (document.getElementById('dynamic-shelves-container')) {
         console.log('📚 Initializing Curated Discovery Sections...');
-        const discoveryShelves = [
-            { type: 'query', query: 'rainy evening', elementId: 'row-rainy' },
-            { type: 'query', query: 'authors:arundhati roy|subject:india', elementId: 'row-indian' },
-            { type: 'query', query: 'subject:classic fiction', elementId: 'row-classics' },
-           {
-                 type: 'query',
-                 query: 'subject:gothic fiction subject:dark academia subject:campus',
-                 elementId: 'row-dark-academia',
-                 vibeDescription: 'gothic, intellectual, melancholic, and candlelit',
-                 fallbackQuery: 'subject:gothic fiction subject:campus'
-            },
-            { type: 'query', query: 'subject:fiction', elementId: 'row-fiction' },
-            { type: 'query', query: 'subject:thriller suspense', elementId: 'row-thriller' },
+        const fallbackShelves = [
+            { type: 'query', query: 'subject:mystery atmosphere', elementId: 'row-rainy', title: 'Rainy Evening Reads', subtitle: 'Mystery & Melancholy', icon: 'fa-cloud-rain' },
+            { type: 'query', query: 'authors:arundhati roy|subject:india', elementId: 'row-indian', title: 'Indian Authors', subtitle: 'Subcontinent Voices', icon: 'fa-feather' },
+            { type: 'query', query: 'subject:classic fiction', elementId: 'row-classics', title: 'Forgotten Classics', subtitle: 'Timeless & Dust-free', icon: 'fa-hourglass' },
+            { type: 'query', query: 'subject:gothic fiction subject:dark academia subject:campus', elementId: 'row-dark-academia', title: 'Dark Academia', subtitle: 'Gothic, cerebral, candlelit', icon: 'fa-feather-pointed', vibeDescription: 'gothic, intellectual, melancholic, and candlelit', fallbackQuery: 'subject:gothic fiction subject:campus' },
+            { type: 'query', query: 'subject:fiction', elementId: 'row-fiction', title: 'General Fiction', subtitle: 'Stories for everyone', icon: 'fa-book-open' },
+            { type: 'query', query: 'subject:thriller suspense', elementId: 'row-thriller', title: 'Thriller & Suspense', subtitle: 'Edge of Your Seat', icon: 'fa-skull' }
         ];
 
         (async () => {