[bug] Store last sync in memory (#1471)

src/services/state.service.ts

@@ -92,4 +92,14 @@ export class StateService
     options = this.reconcileOptions(options, this.defaultInMemoryOptions);
     return await super.setEncryptedSends(value, options);
   }
+
+  override async getLastSync(options?: StorageOptions): Promise<string> {
+    options = this.reconcileOptions(options, this.defaultInMemoryOptions);
+    return await super.getLastSync(options);
+  }
+
+  override async setLastSync(value: string, options?: StorageOptions): Promise<void> {
+    options = this.reconcileOptions(options, this.defaultInMemoryOptions);
+    return await super.setLastSync(value, options);
+  }
 }