switch the encryption secret from localStorage to IndexedDB (because localStorage gets lost so often)

src/components/PushNotificationPermission.vue

@@ -101,7 +101,12 @@
 import { Component, Vue } from "vue-facing-decorator";
 
 import { DEFAULT_PUSH_SERVER, NotificationIface } from "@/constants/app";
-import { logConsoleAndDb, retrieveSettingsForActiveAccount } from "@/db/index";
+import {
+  logConsoleAndDb,
+  retrieveSettingsForActiveAccount,
+  secretDB,
+} from "@/db/index";
+import { MASTER_SECRET_KEY } from "@/db/tables/secret";
 import { urlBase64ToUint8Array } from "@/libs/crypto/vc/util";
 import * as libsUtil from "@/libs/util";
 
@@ -270,7 +275,7 @@ export default class PushNotificationPermission extends Vue {
     });
   }
 
-  private askPermission(): Promise<NotificationPermission> {
+  private async askPermission(): Promise<NotificationPermission> {
     logConsoleAndDb(
       "Requesting permission for notifications: " + JSON.stringify(navigator),
     );
@@ -280,7 +285,8 @@ export default class PushNotificationPermission extends Vue {
       return Promise.reject("Service worker not available.");
     }
 
-    const secret = localStorage.getItem("secret");
+    await secretDB.open();
+    const secret = (await secretDB.secret.get(MASTER_SECRET_KEY))?.secret;
     if (!secret) {
       return Promise.reject("No secret found.");
     }