Add BookDate card stack animations and thumbnail caching

Implements pure CSS card stack animations for BookDate recommendations, including smooth exit and advance transitions. Adds local caching of library cover thumbnails during scans, updates database schema and API to serve cached covers, and enhances BookDate to support 'favorites' scope with a book picker modal. Updates admin settings validation logic for Prowlarr, improves indexer state management, and documents new features and backend changes.

src/lib/processors/scan-plex.processor.ts

@@ -10,6 +10,7 @@ import { ScanPlexPayload } from '../services/job-queue.service';
 import { prisma } from '../db';
 import { getLibraryService } from '../services/library';
 import { getConfigService } from '../services/config.service';
+import { getThumbnailCacheService } from '../services/thumbnail-cache.service';
 import { RMABLogger } from '../utils/logger';
 
 /**
@@ -28,6 +29,7 @@ export async function processScanPlex(payload: ScanPlexPayload): Promise<any> {
     const libraryService = await getLibraryService();
     const configService = getConfigService();
     const backendMode = await configService.getBackendMode();
+    const thumbnailCacheService = getThumbnailCacheService();
 
     logger.info(`Backend mode: ${backendMode}`);
 
@@ -50,6 +52,9 @@ export async function processScanPlex(payload: ScanPlexPayload): Promise<any> {
       }
     }
 
+    // Get cover caching parameters (needed for thumbnail caching)
+    const coverCachingParams = await (libraryService as any).getCoverCachingParams();
+
     logger.info(`Fetching content from library ${targetLibraryId}`);
 
     // 3. Get all audiobooks from library using abstraction layer
@@ -97,6 +102,25 @@ export async function processScanPlex(payload: ScanPlexPayload): Promise<any> {
             },
           });
 
+          // Cache library cover (synchronous with smart skip-if-exists logic)
+          if (item.coverUrl && item.externalId) {
+            const cachedPath = await thumbnailCacheService.cacheLibraryThumbnail(
+              item.externalId,
+              item.coverUrl,
+              coverCachingParams.backendBaseUrl,
+              coverCachingParams.authToken,
+              coverCachingParams.backendMode
+            );
+
+            // Update database with cached path if successful
+            if (cachedPath) {
+              await prisma.plexLibrary.update({
+                where: { id: existing.id },
+                data: { cachedLibraryCoverPath: cachedPath },
+              });
+            }
+          }
+
           updatedCount++;
         } else {
           // Create new plex_library entry
@@ -119,6 +143,25 @@ export async function processScanPlex(payload: ScanPlexPayload): Promise<any> {
             },
           });
 
+          // Cache library cover (synchronous with smart skip-if-exists logic)
+          if (item.coverUrl && item.externalId) {
+            const cachedPath = await thumbnailCacheService.cacheLibraryThumbnail(
+              item.externalId,
+              item.coverUrl,
+              coverCachingParams.backendBaseUrl,
+              coverCachingParams.authToken,
+              coverCachingParams.backendMode
+            );
+
+            // Update database with cached path if successful
+            if (cachedPath) {
+              await prisma.plexLibrary.update({
+                where: { id: newLibraryItem.id },
+                data: { cachedLibraryCoverPath: cachedPath },
+              });
+            }
+          }
+
           newCount++;
           logger.info(`Added new: "${item.title}" by ${item.author}`);