Add back StateService subclass

src/app/services.module.ts

@@ -170,6 +170,10 @@ export function initFactory(
       provide: STATE_FACTORY,
       useFactory: () => new StateFactory(GlobalState, Account),
     },
+    {
+      provide: StateServiceAbstraction,
+      useClass: StateService,
+    },
   ],
 })
 export class ServicesModule {}

src/services/state.service.ts

@@ -1,9 +1,12 @@
+import { Injectable } from "@angular/core";
+
 import { StateService as StateServiceAbstraction } from "jslib-common/abstractions/state.service";
 import { GlobalState } from "jslib-common/models/domain/globalState";
 import { StateService as BaseStateService } from "jslib-common/services/state.service";
 
 import { Account } from "../models/account";
 
+@Injectable()
 export class StateService
   extends BaseStateService<GlobalState, Account>
   implements StateServiceAbstraction