Refactored and improved dark-mode implementation

frontend/src/app/components/library-overview/library-overview.component.ts

@@ -46,13 +46,22 @@ export class LibraryOverviewComponent implements AfterContentInit {
         forkJoin([themeObservable, genreObservable]).subscribe(result => {
           this.availableThemes = result[0];
           this.availableGenres = result[1];
-          this.filterGames();
+          this.refreshLibraryView();
           this.loading = false;
         });
       }
     );
   }
 
+  refreshLibraryView(): void {
+    this.filterGames();
+  }
+
+  clearSearchTerm(): void {
+    this.searchTerm = "";
+    this.refreshLibraryView();
+  }
+
   filterGames(): void {
     this.gameServerService.getAllGames().subscribe(games => {
       let filteredGames: DetectedGameDto[] = games;