Set manga thumbnail as background image

src/lib/metadata/metadata.ts

@@ -60,6 +60,7 @@ const GLOBAL_METADATA_KEYS: AppMetadataKeys[] = [
 
     // themes
     'customThemes',
+    'mangaThumbnailBackdrop',
 ];
 
 /**

src/lib/metadata/metadataServerSettings.ts

@@ -54,6 +54,7 @@ export const getDefaultSettings = (): MetadataServerSettings => ({
 
     // themes
     customThemes: {},
+    mangaThumbnailBackdrop: true,
 });
 
 export const convertSettingsToMetadata = (