Replace old items filter/sort api endpoint with new, handle collapse sub-series

client/components/app/LazyBookshelf.vue

@@ -314,11 +314,6 @@ export default {
       }
 
       let entityPath = this.entityName === 'series-books' ? 'items' : this.entityName
-      // TODO: Temp use new library items API for everything except collapse sub-series
-      if (entityPath === 'items' && !this.collapseBookSeries && !(this.filterName === 'Series' && this.collapseSeries)) {
-        entityPath += '2'
-      }
-
       const sfQueryString = this.currentSFQueryString ? this.currentSFQueryString + '&' : ''
       const fullQueryString = `?${sfQueryString}limit=${this.booksPerFetch}&page=${page}&minified=1&include=rssfeed,numEpisodesIncomplete`
 

client/components/cards/LazyBookCard.vue

@@ -219,7 +219,7 @@ export default {
       return this.mediaMetadata.series
     },
     seriesSequence() {
-      return this.series ? this.series.sequence : null
+      return this.series?.sequence || null
     },
     libraryId() {
       return this._libraryItem.libraryId