fix error is OfferDialog where assignment to a project was missed, plus some refactors

src/App.vue

@@ -375,7 +375,6 @@
 <script lang="ts">
 import axios from "axios";
 import { Vue, Component } from "vue-facing-decorator";
-import { Router } from "vue-router";
 
 import { DEFAULT_PUSH_SERVER, NotificationIface } from "@/constants/app";
 import { retrieveSettingsForActiveAccount } from "@/db/index";